Some diesel engines can be shut down for routine service. Others cannot. A backup generator standing guard over a data center, a propulsion or auxiliary engine on a working vessel, a genset on a remote drilling site – when these run, they need to keep running.
Key Takeaway
Filter duplexing is how a crew changes a fuel filter on equipment without shutting it down.
This guide covers what a duplex fuel filter is, how the configuration works, and how to spec the right one for your application.
What Is Filter Duplexing?
A duplex fuel filter uses two filter housings connected by a three-way isolation valve. Both housings filter fuel during normal operation, which DAVCO refers to as duplex mode. When one filter needs service, the crew turns the valve to isolate that housing while the other stays online and keeps the engine fed. Nothing shuts down. It helps to separate a duplex unit from a dual unit, because the two are easy to confuse.
| Dual Unit | Duplex Unit | |
|---|---|---|
| Flow path | Runs fuel through both housings for higher flow | The same dual configuration, with both housings filtering in duplex mode |
| Isolation valve | ✕ None | ✓ Three-way isolation valve |
| Service without shutdown | ✕ You cannot shut one side off | ✓ Take one filter offline while the equipment runs |
That valve is the whole point of duplex filtration – it’s what lets you take one filter offline while the equipment runs.
How a Duplex System Works
Under normal operation, the unit runs in duplex mode with both filters online. When it’s time to change a filter, the operator switches to isolated mode, closing off one housing so its element can be serviced while the engine draws fuel through the other. This is the hot swap – a filter change with no shutdown.
Some operators prefer to run a single side until that filter loads up, then switch to the other side and service the first; that comes down to preference, but the reason the duplex exists is to let a crew service one housing while the engine keeps running.
Valve Operation
| 1 | For single unit flow, rotate both three-way valve handles either to the left or right, depending on which unit is being used. Point the handles toward the unit you want to isolate. |
| 2 | For dual flow, rotate the valve 180° from the shutoff position (pointing up). |
| 3 | To shut off flow, rotate the valve handle 180° from the dual flow position (pointing down). |
Filter Change Procedure
Change the filter when the fuel reaches the black band at the top of the filter wrap.
| 1 | Isolate the filter that will be changed according to the valve instructions above. |
| 2 | Remove the vent cap and open the drain valve to drain the fuel below the collar level. Close the drain valve. |
| 3 | Remove the collar using the DAVCO collar wrench (P/N 482017DAV for Industrial Pro or 380134DAV for Fuel Pro). Remove the clear cover. |
| 4 | Remove the fuel filter element and seals. Dispose of the filter and the seals properly. |
| 5 | Using a clean shop rag, clean the cover, collar, vent cap, and threads on the DAVCO body. Do not use harsh chemicals to clean the clear cover. |
| 6 | Install the new filter and seals. |
| 7 | Install the clear cover and collar. |
| 8 | Apply downward pressure on the top of the cover and rotate the collar until contact. |
| 9 | Use a DAVCO collar wrench, if necessary, to tighten the collar three additional ribs. |
| 10 | Prime the DAVCO unit and check for leaks. |
When the service is done, return the isolated housing to service and the unit goes back to duplex mode.
How a Double-Filter System Allows Continuous Operation and Saves Shutdown Costs
With one filter housing, servicing the element means taking the engine offline. For most equipment that is perfectly fine, and it’s worth being clear about why.
DAVCO works with customers up front to spec the right unit and configuration to reach a target service interval and meet or exceed performance requirements. The unit is then changed at that predetermined interval alongside other engine and equipment maintenance – an oil change, for example – so the fuel filter service is not a separate stop. It’s part of the planned maintenance the equipment was coming down for anyway.
Operators who run single units know their allowable downtime window and plan around it. Unplanned downtime usually points to a fuel quality problem. If a filter plugs early due to poor fuel, that is the filter doing its job. A plugged element is far cheaper to change than the injectors, pump, and fuel-system components it just protected – the ones that could take equipment down for days or weeks at serious cost.
The bottom line: Duplex enters the picture when there’s no acceptable downtime window at all.
When You Genuinely Need Duplex
Use a duplex configuration when the engine or equipment cannot be shut down. If higher fuel flow is all you need, work with DAVCO to look at larger single unit, dual, or triple options. When a customer tells us the equipment cannot go offline, that calls for duplex.
Duplexing Across DAVCO’s Product Lines
Duplex configurations are available across the lines built for continuous-duty work.
| Product Line | Built For | Duplex Detail |
|---|---|---|
| Industrial Pro | Power generation, mining, oil and gas , and other off-road applications | These units offer short and tall duplex builds, sized to different flow rates. This is the line behind backup power for the always-on facilities noted above. |
| Sea Pro | Commercial marine | This is the ABS-approved choice. Its filter sits inside a fully enclosed steel body, which is what lets the Sea Pro hold up in a marine environment and protect against water intrusion. |
| Fuel Pro | Power generation and smaller engines where continuous operation still matters | A duplex option is on the way. The forthcoming Fuel Pro 394 takes the trusted Fuel Pro 382 and puts it into a duplex configuration. |
How You Know When to Switch and Service
DAVCO does not rely on differential-pressure gauges or sensors on most products. Instead, the clear cover, with its Seeing Is Believing® design, shows operators real time insight into their filter life and fuel system health.
The cover holds a finely calculated pressure, and as the fuel filter element loads with contaminants the fuel gradually overrides that pressure and rises up the filter. When the fuel reaches the band at the top of the filter, it’s time to change it.
Because its filter is sealed inside a steel body for ABS approval, there’s no clear cover, so it’s serviced at a predetermined hour interval, with an optional pressure gauge available.
How to Spec a Duplex Fuel/Water Separator
Sizing a duplex fuel water separator comes down to fuel flow, with one detail that trips people up. The unit has to handle the engine’s full fuel flow in isolation mode – not just in duplex mode – because isolation mode is what it runs on during a filter change. Most engine manufacturers require it.
| Industrial Pro Unit | Duplex Mode | Isolation Mode | Covers a 500 GPH engine mid-change? |
|---|---|---|---|
| Short Duplex | 600 GPH | 300 GPH | ✕ Short of the 500 the engine demands while one side is offline |
| Tall Duplex | 1,200 GPH | 600 GPH | ✓ Covers the 500 even mid-change |
Here is the trap. Say an engine needs 500 GPH. The right choice is usually the Industrial Pro Tall Duplex. It can look like overspending up front, but it is a safety factor for when the unit runs on one side and can protect from unnecessary downstream costs.
One more note: The engine manufacturer – Cummins, Caterpillar, and the like – is the source of truth here, because they designed and built the engine. Follow their recommendations, or work with DAVCO to interpret them.
Some customers also choose to oversize on purpose, stepping up to a larger filter for longer filter life and longer service intervals. That is a fine call; it simply costs more for capacity you may not need.
Duplex in the Field
Axis Newco builds power generation packages for mission-critical environments using DAVCO Sea Pro duplex units. Those packages go offshore, where the Sea Pro’s enclosed body protects against water intrusion in an environment that cannot shut down. Read more about how this power gen rental fleet doubled maintenance intervals.
A separate data center operator moved from a single unit to a tall duplex specifically because their operation cannot stop – the duplex lets them service filters while the facility’s power stays online. Read more about how this data center keeps backup power constant.
Spec Your Duplex Configuration
The 2027 model year is bringing another round of emissions changes to on-highway diesel engines, and fleet managers are right to ask what it means for how they run their trucks. The honest answer is less dramatic than the headlines, but it still matters.
Key Takeaways
Cleaner, more sophisticated engines increase what a fleet stands to lose when contamination gets through. That’s exactly why fleet fuel filtration – starting with the fuel filter and water separator – keeps moving up the list of equipment that protects uptime.
DAVCO solutions featuring Fleetguard filters from Atmus Filtration Technologies rise to the occasion and provide the protection 2027 engines need.
What the 2027 Emissions Rules Actually Mean for Fuel Cleanliness
It’s easy to assume every emissions change rewrites the rules on fuel cleanliness. It doesn’t. The last time that really happened was 2010, when the industry moved to ultra-low-sulfur diesel, brought high-pressure common rail into play, and introduced the modern aftertreatment system. That was a completely different combustion recipe.
| Focus | 2010 (ULSD Transition) | 2027 Model Year |
|---|---|---|
| Combustion Recipe | A completely different recipe – ULSD, high-pressure common rail, and the modern aftertreatment system all arrived | Largely unchanged; engines still run high-pressure common rail |
| Engine Conditions | — | Possible higher compression ratios and higher exhaust temperatures |
| Fuel-Cleanliness Spec | Redefined the rules on fuel cleanliness | No significantly stricter spec – fuel still needs to be as clean as it has been for years |
For 2027, that recipe is largely unchanged. Engines still run high-pressure common rail. There may be increases in compression ratios and higher exhaust temperatures, but the move from current trucks to next year’s trucks isn’t expected to bring significantly stricter fuel cleanliness – it still needs to be as clean as it has been over the past several years. There’s no clean one-to-one link between the new NOx standard and a stricter fuel-cleanliness spec.
Key Takeaways
Clean diesel fuel filtration has always been a priority. However, with the introduction of High Pressure Common Rail (HPCR) fuel systems, there has been an increased emphasis on improving filter efficiency and extending capacity. The 2027 trucks don’t change that priority so much as raise the stakes on getting it right.
Why Water Is the Real Threat to Your Injectors
On a Class 8 truck running high-mileage duty cycles, water is where the damage starts. A few aspects do most of the harm:
Prolonged exposure to trace water tends to show up first as poorer performance – combustion that isn’t as complete, fuel economy that slips, and drivers reporting low power and higher fueling costs before anything breaks. By then, the repair and the downtime are already in motion.
All of it argues for stopping water well upstream of the injector, and for one maintenance habit fleets still underuse.
A Fuel / water separator can only protect the engine if the trapped water gets drained on schedule. When the filter does its job, the end user still must do theirs.
Planning for the Fuel You Actually Get
Long-haul fleets don’t always control the fuel they take on. Fueling across hundreds of truck stops means inconsistent quality, and in some pockets, that fuel can be extremely poor.
On-highway fleets can’t test fuel at the pump the way a bulk operation can, so the signals come after the fact. Following the OEM’s service intervals is the baseline. Beyond that, a drop in power or fuel economy – or a separator that needs draining more often than usual – tells you the fuel is working against you.
And a filter that comes up short of its mileage rating isn’t failing. An OEM can rate a fuel filter for a set number of miles, but that’s completely dependent on what the filter is actually filtering out. When you get a bad batch of fuel, your filter life takes the hit, but your fuel system stays safe. That’s the filter doing its job.
How Biodiesel and Renewable Blends Affect Service Intervals
Biodiesel is a smaller factor for most on-highway fleets than the trade press implies. Typically, you won’t see a lot of bio demand at truck stops around the highway, though it varies by region.
Where B20, B40, and renewable paraffinic blends are in play, the general rule holds – higher blends tend to shorten filter life. How much depends on several variables:
The practical move is to start with the OEM’s fuel-quality requirement for the blend you run, and confirm that what you’re buying meets it. DAVCO filtration is built to protect the fuel system across biodiesel and renewable blends, but even clean, in-spec blend fuel won’t always deliver the same service interval the OEM publishes for straight diesel. Variable fuel chemistry is a real spec consideration.
Seeing the Problem Before It Reaches the Injector
The most useful shift for fleets is moving away from changing filters on a fixed mileage number and toward servicing based on what the fuel is actually doing. That depends on being able to see into the fuel system – the whole idea behind DAVCO’s Seeing Is Believing® clear cover. During a walkaround or pre-trip inspection, a driver or technician can read filter status in real time:
Cold weather adds another use. DAVCO offers heating options for that scenario, including a 120-volt AC preheat for trucks parked with access to facility power, and a 12- or 24-volt DC heating probe wired to the accessory circuit, so a driver can melt a pathway through gelled fuel and get moving. For fleets running through winter, that visibility pairs directly with DAVCO’s cold weather options.
Built for 2027: The Fuel Pro Line and the Uptime Question
DAVCO develops its on-highway products in collaboration with each OEM.
The uptime angle is where fleet managers most often need a second look at their assumptions. Every technology shift brings a learning curve on the maintenance side, and as 2027 engines introduce that curve, protecting uptime matters more, not less. That’s where extended service intervals earn their keep.
DAVCO’s Fuel Pro 48x line carries roughly two and a half times the media of the company’s earlier flagship models, enabling the longer intervals between changes that keep trucks on the road.
Realizing that benefit takes one change in habit: letting the fuel level reach the top of the filter before swapping it, rather than changing early. The right filter also protects the OEM as much as the fleet. If bad filtration gets into the filter housing, warranty claims for failed injectors, engine components, and fuel pumps can follow. And genuine product matters:
The Bottom Line for 2027 Fleets
Engines are getting more capable and less tolerant of neglect, and the fuel coming into them is as variable as ever. That’s what makes fuel cleanliness a spec decision, not a parts-counter afterthought. The higher injection pressures, tighter component tolerances and advanced aftertreatment technologies expected in 2027-compliant engines will require cleaner fuel and more consistent water separation than ever before.
Fleetguard offers an array of filtration technology designed to meet these demands by delivering exceptional particle removal efficiency, greater contaminant-holding capacity and sustained performance throughout the service life of the filter. When paired with DAVCO fuel processors, Fleetguard filters help ensure the ultra-clean fuel modern engines demand, protecting expensive injectors, reducing downtime and supporting long-term compliance with evolving engine requirements.
The Bottom Line
Fleets that right-size their fuel filter and water separator to the duty cycle and the fuels they run – and that use the visibility a clear cover gives them – build diesel injector protection and predictable uptime into the truck, instead of chasing failures after the fact.
Explore the Fuel Pro line or DAVCO’s full range of on-highway fuel filtration products.
Key Takeaways
Data center SLA penalties shift massive financial risk to power generation packagers, with downtime costing up to $15,000+ per minute and contracts demanding 99.999% uptime.
Smart packagers are specifying the best filtration systems to protect their profit margins from catastrophic, highly expensive Tier 4 engine warranty claims often caused by fuel issues.
Duplex filtration configurations allow for hot-swapping filters under load, ensuring filter maintenance never causes downtime or a breach of the SLA.
The High Stakes of Data Center SLAs
Data center clients have high expectations for their service level agreements (SLAs), putting the burden on power gen packagers who work with them. One of the major reasons is because data center clients are unforgiving when it comes to power failures. In fact, many commit to 99.999% uptime, leaving only 5.26 minutes of downtime annually.
Put simply, downtime costs money – a lot of money.
Data center downtime costs can be astronomical, ranging from $10,000 to $30,000 per minute for colocation facilities, and exceeding $15,000 per minute for hyperscale AI environments.
How SLA Penalties Are Shifting Risk to Packagers
When the grid fails, backup generators are the only things preventing a data center from losing millions in revenue. To prevent this financial catastrophe, SLAs often include strict penalties, liquidated damages, and the threat of customer churn if uptime commitments are not maintained.
Watch out: In short, data centers use SLAs to transfer financial risk down the supply chain, so power generation packagers are often on the hook for equipment performance and maintenance response times.
Why Packagers Are Specifying the Best Filtration to Protect Margins
Since standby generators are so crucial, making sure they’re in optimal condition and ready to run is vital to avoiding problems and SLA violations.
Infrequent use – Unlike most vehicles, which are regularly operated, standby generators sit for weeks or months on end, which allows water to accumulate and algae to grow at the bottom of the tank.
Costly failure – Plus, in modern Tier 4 engines, injector pressures are so high that any sediment or debris that reaches the injectors can create rapid, catastrophic, and expensive failures.
Unwanted risks – Stagnant diesel fuel poses a looming threat to warranty claims, and one power generation packagers can’t afford.
The modern strategy involves specifying improved fuel filtration as margin protection. Investing slightly more upfront saves a world of trouble and margins later. With the use of fuel water separators, packagers can:
✓ Prevent engine damage
✓ Avoid clogging
✓ Lower maintenance costs
✓ Drastically reduce the risk of breakdowns
What Filtration Configurations Meet Data Center Uptime Requirements
When you work with a data center, you don’t have the luxury of conducting routine filter changes in the standard way – you can’t waste the downtime.
The solution is leveraging the power of duplex fuel water separators, as these let operators isolate one filter, swap it out, and keep the engine running while the other filter remains operational. You keep the engine running, protecting data center uptime, and you don’t risk SLA violations.
DAVCO’s Industrial Pro® Series offers a couple of duplex filter options that require no shutdown for servicing, including:
Integrated check valves and duplex isolation valves allow facilities to swap filters during operation, eliminating maintenance-related downtime and keeping your data center clients happy.
We’ve even seen a case where one southeastern U.S. data center upgraded to our Industrial Pro® 692 Tall Duplex filter and was able to completely eliminate shutdown filter changes—extending their service intervals to over 1,000 hours.
FAQs
What are the main hazards of storing diesel fuel for standby generators?
While they are tested monthly, standby generators sit dormant for extended periods and stagnant fuel can build up with an accumulation of water, sediment, debris, and microbial growth, putting data center uptime at risk.
Why is fuel filtration critical for Tier 4 generator engines?
Modern Tier 4 engines operate with extremely high injector pressures, meaning even microscopic amounts of water or debris can cause catastrophic and highly expensive engine failures.
How do duplex fuel filters prevent data center downtime?
Duplex systems use isolation valves that let technicians shut off one side of the unit to swap a filter while the engine continues to run on the other, permitting continuous operation and supporting data center uptime during ongoing work or critical events.
Protect Your SLA with Duplex Fuel Water Filters
Backup power has to bridge the gap flawlessly. Using a dual fuel water filtration system will protect both your client’s uptime and your own bottom line. Contact our team for help in finding the right system.
Key Takeaways
- Contaminants are multifaceted – Poor fuel quality introduces water, particulates, and microbial growth within systems that can severely damage engines.
- Water is an injector’s worst enemy – Water infiltration displaces vital lubricative coatings, creating surface pitting, tolerance erosion, and costly breakdowns.
- Advanced filtration delivers reliable protection – Advanced fuel water separators with clear covers help prevent engine damage, reduce maintenance costs, and allow operators to verify fuel quality before problems arise.
The Hidden Threat in Your Tank
To keep your engines operational, you need clean fuel you can rely on, but varied contaminants can creep in and cause a host of problems. Poor-quality fuels with dirt, water, and microbes can plug fuel water separators, cause injector failures, propagate rust, and allow bacteria and fungi to flourish.
“Bad fuel” isn’t a single, clear-cut problem – it’s a multilayered threat that puts expensive machinery at risk.
What “Bad Fuel” Actually Means at the Tank
Poor fuel quality is the result of three major elements, any combination of which can be present at a given time:
| Contaminant | How It Enters and What It Does |
|---|---|
| Water | Condensation entering storage tanks can create an environment ripe for corrosion and rust. |
| Dirt and particulates | Small bits of dirt and other materials can enter tanks during transfer and refueling. |
| Microbes | Bacteria, fungi, and other microbes can develop in fuels since they feed on fuel mixtures. |
Every touchpoint from storage container to tank creates opportunities for contamination, which can result in water in diesel fuel, bad fuel injectors, and permanent damage to pumps, engines, and other critical components. To keep these problems at bay, proper fuel filtration is essential.
How Water in Diesel Fuel Destroys Injectors
A bad fuel injector rarely fails on its own – it’s often the result of a mechanical chain of failure brought about by contaminants like water or particulates that got past inadequate separation.
Worse, water will flash to vapor under high injection pressure, physically eroding injector tips. The result is a costly repair featuring an injector replacement and labor, compounded by the downtime suffered by your operations.
labor costs, and downtime.
The Cost of Injector Failure vs. Effective Filtration
The cost of injector failure is multifaceted, encompassing:
• Parts
• Labor
• Towing
• Lost route or production time
Repairs and replacements hurt your bottom line, and one failure event can easily dwarf the cost of a proper fuel filtration system that would prevent long-term issues. Keeping water, particulates, and microbes out of your fuel and keeping your operations running saves you the headaches and unneeded expenses.
What Proper Filtration and Water Separation Looks Like
A quality fuel water separator:
Proper filtration requires an all-in-one solution for diesel filtration and water separation, and one capable of handling high flow rates, like our Fuel Pro® and Diesel Pro® lines do. These systems facilitate high-efficiency water separation while filtering out damaging particulates tailored to the engine’s tolerance.
But you can’t fight what you can’t see. That’s why these DAVCO systems feature our exclusive “Seeing Is Believing®” technology that uses a clear cover that allows operators to know exactly when filter replacements are needed.
No wasted time, no wasted filter replacements – just maximized uptime.
FAQs on Fuel Water Separators
What happens if bacteria or fungi get into my diesel fuel?
Poor-quality diesel fuel allows bacteria and fungi to thrive, leading to severe microbial growth that can plug fuel water separators and damage your entire system. But high-quality filtration systems trap these contaminants, preventing them from reaching critical engine components.
How do I prevent diesel fuel from gelling in cold weather?
To combat winter fuel issues, use filtration systems outfitted with cold weather options and fuel heating technology. These systems prevent diesel fuel from gelling while ensuring continuous water and contaminant removal.
Protect Your Engines with DAVCO Systems
Contaminants that seep into your engine can do massive damage and lead to costly repairs and downtime. Don’t risk your equipment – keep a close eye on it with the clear-cover fuel water separators from DAVCO.
DAVCO Technology Unveils New Fuel Pro® 498 Model Enhancing Fuel/Water Separation
Saline, Michigan (March 17, 2026) – DAVCO Technology, a leading North American provider of diesel fuel water separators and filtration systems, proudly announces the launch of its latest innovation, the Fuel Pro® 498 model. Engineered in collaboration with major OEM engineering teams, this model offers superior engine protection and helps increase uptime, setting a new benchmark in diesel fuel filtration.
The Fuel Pro® 498 is the next generation of the Fuel Pro® 48X series, integrating the coolant heat features of the Fuel Pro® 483 with the 3-layer filtration of the Fuel Pro® 488 into one unit providing 15-micron filtration. This enables better engine operation in cold weather, as well as water separation exceeding engine OEM requirements. DAVCO offers multiple heating solutions for the Fuel Pro® 498, including the latest improved fuel heater. These heat solutions help improve cold starts and provide continuous heating for on-road operation. DAVCO is currently testing to expand the Fuel Pro® 498 offering to other OEMs.
“Working on the Fuel Pro® 498 has been a collaborative effort to ensure the new series that are coming to the market will run better in challenging weather conditions while also maintaining the high level of engine and fluid system protection DAVCO customers have come to expect”, said Scott Montesi, President, DAVCO Technology.
Incorporating DAVCO’s Seeing is Believing® technology, the Fuel Pro® 498 allows drivers to visually monitor fuel filter status, reducing maintenance costs and minimizing downtime. With the Seeing is Believing® technology, drivers can easily determine when their filter needs to be changed. More importantly, drivers and technicians can also determine when it doesn’t need to be changed, preventing unnecessary replacement costs. The Fuel Pro® 498 also features the Elemax® design, maximizing filter life by optimizing fuel flow through the entire filter media by creating a vapor barrier relief to give a visual cue for when the media has been fully saturated with contaminants, thereby extending maintenance intervals and engine uptime.
“The Fuel Pro® 498 incorporates a range of advanced features purpose‑built to enhance engine performance and overall efficiency,” said Sean Kilfin, Director of On‑Highway Sales at DAVCO. “It safeguards diesel engines from harmful contaminants, helping reduce maintenance‑related downtime while enabling quick visual diagnostics. Its upgraded filtration technology supports more environmentally responsible filter changes and makes the priming process simpler for easier starts. The Fuel Pro® 498 is also compatible with biodiesel blends up to B20, providing a versatile and eco‑conscious solution for a wide variety of fuel applications.
With the Fuel Pro® 498, DAVCO continues to drive innovation and set new standards in diesel fuel filtration, ensuring that the trucks of today and tomorrow run cleaner, longer, and more efficiently.
Learn more about the Fuel Pro® 498.
About DAVCO Technology: DAVCO Technology is a North American leader in Class 5 through 8 diesel truck fuel filtration and water separation systems. In addition to the popular Fuel Pro® line for heavy-duty trucks, DAVCO also produces Diesel Pro® for medium-duty trucks, Sea Pro® for marine applications, and Industrial Pro® models for larger off-road applications. The Shop Pro® is a multi-purpose shop floor and service truck tool for priming diesel engines, removing fuel from fuel system components, sweeping diesel fuel tanks, and transferring diesel fuel between storage tanks. DAVCO products are designed for tough commercial industries including on-highway, agriculture, construction and industrial, mining, work boat, oil & gas, and power generation applications. For more information, visit https://davco.com/.
About Clarience Technologies: Clarience Technologies is a global leader of visibility, safety and digital technologies for transportation. Built on the foundation of proven company brands each with a legacy of innovation, its solutions include vehicle lighting, camera and vision systems, telematics and safety solutions that protect our world and our livelihoods by keeping people, assets and businesses safe, secure and productive. Its team of companies includes Al-Van, AMFS, American Van, Code 3, DAVCO, Durite, ECCO, Elkhart Brass, Foam Pro, FRC, Kerr, Labcraft, LED Autolamps, Lumitec, Pressure Systems International, Prime Design, Randall, Ranger Design, RIGID, Road-Ready, Roll-Rite, R.O.M., RVS, Safe Fleet (Law, Bus & Rail), SEON, Truck-Lite and Vango. For more information, visit www.clariencetechnologies.com.
💡 Key Takeaways
Identify the early warning signs –Learn to distinguish between “clouding” (32 °F) and actual gelling (<20 °F) to prevent engine starvation
Understand fuel variables –Why regional fuel blends (summer vs. winter) and biofuels increase the risk of gelling even in moderate climates
Select the right heating solution – How to choose between electric pre-heaters, overnight plug-ins, and coolant/return fuel heating for total protection
Winter brings with it a lot of hazards, and gelled fuel is a commonly overlooked one. Gelled diesel fuel can block filters and lines, which both starves your engine and leads to hard starts, no starts, and operational downtime. Plus, getting stranded can result in costly tows and emergency services, especially when your operators are in remote areas.
Protect your investment with DAVCO fuel filtration systems. Our industry-leading solutions remove water from fuel and inhibit gelling, giving you something you can count on even when the weather is unpredictable. Let’s take a look at how to prevent diesel fuel gelling.
The Science of Gelled Diesel Fuel – It Starts Before Freezing
Untreated fuel doesn’t gel immediately; it first begins to cloud before it starts to gel. Clouding begins at freezing (32 °F) but generally doesn’t cause any problems at this stage.
Once fuel drops below 20 °F, it can gel into a waxen state that’s very difficult to return to liquid.
When fuel gels, it often leads to clogging and operational issues, usually necessitating a filter replacement.
Some other aspects to consider include:
- • Some drivers might experience issues if they’re heading from warmer climates, like Florida for instance, and heading north without using fuel that features winter additives, relying instead on a summer mix
- • Modern fuels can behave differently, as high-percentage biodiesel can cloud above 32 °F depending on what it is made from, with some even clouding at 40 °F
| Stage | Temperature | What Happens |
|---|---|---|
| Clouding | ~32 °F | Fuel becomes hazy; generally no issues yet |
| Gelling | Below 20 °F | Waxen state; clogs filters and lines |
| Biodiesel Risk | Above 32 °F (up to 40 °F) | High-% biodiesel may cloud earlier |
Spotting the Symptoms
Don’t get left out in the cold – literally. Know the signs of diesel fuel gelling so you and your operators can take action:
- Hard starts or no starts
- Rough running
- Low power
- Low-pressure warning light
Along with these, if you use a DAVCO fuel/water filtration system, you can benefit from our Seeing Is Believing technology with its clear cover. You’ll be able to easily see clouded fuel as well as gelled fuel if it progresses to that stage.
First Lines of Defense
There are some key steps that companies can take alongside fuel filtration systems to prevent gelling and keep their equipment operational. These include:
- • Using a quality fuel that contains a reputable additive product (both cold-weather and warm-weather additives are available)
- • Setting up a tank maintenance program to check on a range of issues, including diesel fuel clouding and gelling
- • Keeping the engine running at a high idle in a pinch if additive and heating options aren’t currently available
- • Using DAVCO cold-weather heating solutions to protect against variables that operators cannot control
The Ultimate Solutions for Preventing Diesel Fuel Gelling
DAVCO is proud to offer the industry’s leading solutions for fuel gelling prevention and water and contaminant removal:
- • 120 VAC Overnight Heaters – These heaters warm fuel when your truck is sitting and potentially freezing on cold winter nights, using the same power outlet used by engine block heaters.
- • 12 VDC and 24 VDC Pre-heaters – We offer numerous pre-heaters that correspond with our Fuel Pro® and Diesel Pro® systems, using the ignition switch to heat fuel prior to running the engine. Medium-duty and heavy-duty options available.
- • Fluid Heat – This approach uses coolant or a return fuel blend to warm the fuel in the DAVCO unit while the vehicle is in operation.
FAQs on Gelled Diesel Fuel
Can I use a DAVCO overnight heater if my truck already has a block heater?
Yes, if your truck uses a 120 VAC plug for the block heater, you can use a DAVCO “Y” cord (P/N 102015) to wire the pre-heater into the same harness.
Does high-idle prevent gelling if I don’t have a heater?
Running at high idle is a costly but effective emergency measure, if you lack additives or heaters, but it is not a recommended long-term solution.
Why does my fuel level look inconsistent or high during cold weather?
When diesel fuel begins to cloud (before it fully gels), it can cause the fuel level in the clear bowl to rise, which is often mistaken for a plugged filter.
Choose DAVCO to Prevent Diesel Fuel Gelling
A stalled truck = costly downtime + expensive repairs.
Keep your fuel operational and flowing freely with the cold-weather solutions from DAVCO. Reach out to us to get started.
Saline, Michigan (October 18, 2022) – DAVCO Technology, the North American leader in fuel-water separators and a Clarience Technologies company, today announced the launch of the Shop Pro FXP 95 — the latest version of its well-known Shop Pro product, now redesigned with the needs of modern fleets in mind.
“Today’s fleets want to work smarter, better, and faster,” said Joe Schaffer, Director of Engineering at DAVCO. “The new Shop Pro FXP Series takes a holistic approach in helping fleets achieve this goal. First, by enhancing the quality of the equipment itself, and second by improving the ease-of-use for technicians in the field.”
New Filtration Technology and Ergonomic Design Are Hallmarks of New Shop Pro Series
Shop Pro FXP products use the same three-layer filtration technology that is utilized in DAVCO’s newest Fuel Pro models providing better filtering and removal of contaminated fuel, sediment, and water, when transferring fuel or cleaning fuel tanks. The three layer technology strips water from outside the media with two inside stripping operations, including a coalescent layer and a hydrophobic layer. This ensures no water will pass thru the filter, even ultra-low sulfur and biodiesel, which are difficult to separate.
In addition to the improved performance of the product, the Shop Pro FXP is also 44 pounds lighter and 15 percent more compact than the previous version. It’s in these features that DAVCO’s creative approach to uptime shines through.
“When fleets think of uptime, they often think of preventative maintenance through telematics and other monitoring devices,” said Schaffer. “While this is a key component of uptime, simplifying operations related to required manual maintenance is critical to getting diesel trucks back on the road faster.”
Seeing is Believing: True Then, Now, and Later
DAVCO’s quest to streamline operations for fleets began long before it’s latest product innovation. Launched in 1993, DAVCO’s Fuel Pro and Diesel Pro products introduced a never-before-seen clear-top filter that offered immediate visual inspection of fuel condition and available filter life. Today, customers ask for the clear top by name, and it’s this transparency that has earned DAVCO the trust of top fleets.
Recently, DAVCO has been using these customer relationships to not only continue innovating for diesel customers, but also to support the transition to an electric and autonomous future of trucking.
In January 2022, DAVCO announced a $3.5 million investment in its Saline, Michigan, campus to create an Advanced Electronics Manufacturing Center, extending its manufacturing capabilities into advanced electronics technologies that will become more prevalent with electric-powered commercial vehicles. The state-of-the-art facility sits adjacent to the existing DAVCO manufacturing facility and is currently producing telematics hardware for another Clarience Technologies company, Road Ready.
Yet, DAVCO’s main focus for the immediate future will be innovations for diesel-powered vehicles like that of the new Shop Pro FXP Series — given that most fleets will continue to operate diesel trucks in some capacity for at least the next decade.
The company is expected to continue making improvements to its existing product lines throughout the next year.
About DAVCO
DAVCO is the North American leader in Class 8 heavy-duty diesel-powered truck fuel-heater/water separators and filter systems. In addition to the popular Fuel Pro® line, DAVCO also produces the Diesel Pro® for medium trucks, Sea Pro® for marine applications, Industrial Pro® models for off-road applications and a line of industrial automatic oil replenishment systems, with regulators, slow flow meters, and fluid level switches. The Shop Pro is a multi-purpose shop floor and service truck tool for priming diesel engines, removing fuel from fuel system components, sweeping diesel fuel tanks and transferring diesel fuel between storage tanks. DAVCO products are designed for tough commercial applications including On and Off-Highway, Industrial, Gen Set, Construction, Military and Marine.
About Clarience Technologies
Clarience Technologies focuses on developing vehicle and fleet management technology innovations for the commercial vehicle, passenger car, recreational off-road machine and pleasure craft markets. Through our data and insights, we improve fleet management, streamline supply chain management and enhance safety on and off the road. Since our Truck-Lite brand introduced the first sealed marker light in 1955, our companies have unveiled a steady stream of innovations that have turned customers into long-term partners. Today, Clarience Technologies is a global company known for its quality and dedication to sustainability – and to providing the technologies that keep our world moving forward. Learn more at www.clariencetechnologies.com.
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Saline, Michigan (January 4, 2022) – DAVCO, the North American leader in fuel heater/water separators and filter systems for diesel-powered medium- and heavy-duty trucks, off-highway equipment and commercial marine applications, is investing $3.5 million in its Saline, Michigan, campus to create an Advanced Electronics Manufacturing Center, extending its manufacturing capabilities into advanced electronics technologies as the company prepares to capitalize on the arrival of electric-powered commercial vehicles. The state-of-the-art facility sits adjacent to the existing DAVCO manufacturing facility and is expected to be fully operational in early 2022. Company officials expect this new facility will create 20 new positions.
“Over the past 45 years, DAVCO has proudly served customers with industry-leading products and unparalleled customer support and that will not change,” said Laurie Beegle, President at DAVCO. “This new electronics manufacturing facility ensures we will continue to be able to serve commercial fleet customers as their needs evolve once they begin putting electric vehicles into service.”
DAVCO is owned by Southfield, Michigan-based Clarience Technologies, a global leader in advanced transportation technology that includes Truck-Lite, RIGID and Lumitec advanced LED lighting, ECCO and Code-3 safety systems and Road Ready advanced telematics.
A Manufacturing Showcase for the Future of Transportation
The new DAVCO Advanced Electronics Manufacturing Center is housed in DAVCO’s corporate office campus in Saline, Michigan, where work has been underway to transform the space since Fall of 2021. DAVCO fuel filtration products will continue to be manufactured in an adjacent building on the DAVCO campus in Saline and are not impacted by this announcement.
The $3.5 million capital investment includes a clean room for component manufacturing, increasingly more important in next-generation vehicle technologies. The company expects the center will be used often with customers to showcase the capabilities of DAVCO, Clarience Technologies and its entire family of companies and plans for a second phase that will include a modern Customer Experience Center.
Overall, the company expects to hire as many as 20 new positions as the center continues to ramp up operations. Those interested in applying for open positions at the Advanced Manufacturing Operations Center should visit DAVCO.com/careers.
Center Will Initially Focus on Telematics Manufacturing to Support Road Ready Growth
Operations at the Advanced Electronics Manufacturing Center have already started and DAVCO expects the facility to be fully operational this winter. Initially, the center will be responsible for manufacturing electronics hardware for Road Ready advanced telematics, a company within the Clarience Technologies family. Road Ready offers advanced telematics solutions for commercial transportation and has experienced significant growth this past year. By consolidating manufacturing at the new Michigan facility, Road Ready telematics hardware will be assembled efficiently by an experienced team that’s dedicated to the Road Ready business. Manufacturing includes all Road Ready hardware, mobile communications units, smart bridge integrators, Road Ready proprietary sensors and other related items. As connected vehicle technologies become the digital backbone supporting electric and autonomous vehicles over time, Road Ready expects demand for their solutions to continue reach new heights.
As Commercial Vehicles Go Electric, DAVCO Maintains Strong Customer Focus
While the company has always focused on providing solutions for diesel engines, the reputation that DAVCO has built extends beyond any specific technology. The company has succeeded due to customer focus — listening to customers, identifying their needs and delivering solutions with a laser-like focus. This approach has served customers well, resulting in products built consistently and to the highest quality standard with support that goes above and beyond what’s expected.
As commercial transportation adopts electric vehicle technology in the coming years, DAVCO believes that same customer focus they’ve long embraced will help them embrace a broader role—one of an experienced customer partner armed with the right tools that helps deliver more agile and scalable solutions. This is the reason the company is expanding its capabilities to include advanced electronics solutions. For DAVCO, partnering with and providing more flexible solutions to customers will make the company indispensable once the industry gets a hands-on education as electric vehicles gain widespread adoption.
With many electric vehicles in development today, manufacturers are actively working closely with their supply base to finalize product designs. Once demand accelerates, manufacturers will lean on their supply bases to deliver what’s needed to scale production. Vehicles built on new technology will result in many new components – likely from suppliers who have not previously served the commercial transportation industry. DAVCO sees this as an opportunity to leverage its industry experience, which will be invaluable to OEMs.
“The dramatic fluctuations in vehicle demand experienced in the North American commercial vehicle market – unlike anything seen in any other industry – will only be amplified with electric vehicles. We believe customers will take solace in the fact that we understand what’s required as these fluctuations occur,” said Beegle.
Clarience Technologies: Leading Brands Prepared for the Transportation Future
Clarience Technologies was established in 2020 as a company designed to lead and thrive in the future of transportation. Its brands are among the leading names in transportation technology, including LED smart lighting, safety and alarm components and advanced telematics. All brands are ranked number one in the markets they serve. As the parent company, Clarience Technologies provides best-in-class capabilities, global scale and a bold vision born from its commitment to continue serving both current and future customers.
By understanding the impact new technologies are set to make in transportation, the Clarience team forged itself as a new company dedicated to finding better ways of applying these transformational technologies.
“As global transportation faces significant changes as new technologies take hold, customers are turning to those who have remained a step ahead of what’s on the horizon,” said Brian Kupchella, CEO of Clarience Technologies. “Clarience Technologies was formed to help ensure these well-known transportation brands would be around well into the future.”
Company officials have also forged strong relationships with several top-tier universities, including Michigan State University and Lawrence Technological University in Michigan and Carnegie-Mellon University and Penn State Behrend in Pennsylvania, which serve as key enablers to foster future innovations. Similarly, with the DAVCO Advanced Manufacturing Operations Center located only minutes from downtown Ann Arbor and the University of Michigan, the company envisions this facility someday strengthening ties to the university and the overall Ann Arbor community.
About Clarience Technologies
Clarience Technologies focuses on developing vehicle and fleet management technology innovations for the commercial vehicle, passenger car, recreational off-road machine and pleasure craft markets. Through our data and insights, we improve fleet management, streamline supply chain management and enhance safety on and off the road. Since our Truck-Lite brand introduced the first sealed marker light in 1955, our companies have unveiled a steady stream of innovations that have turned customers into long-term partners. Today, Clarience Technologies is a global company known for its quality and dedication to sustainability – and to providing the technologies that keep our world moving forward. Learn more at www.clariencetechnologies.com.
About DAVCO
DAVCO is the North American leader in Class 8 heavy-duty diesel-powered truck fuel-heater/water separators and filter systems. In addition to the popular Fuel Pro® line, DAVCO also produces the Diesel Pro® for medium trucks, Sea Pro® for marine applications, Industrial Pro® models for off-road applications and a line of industrial automatic oil replenishment systems, with regulators, slow flow meters, and fluid level switches. The Shop Pro is a multi-purpose shop floor and service truck tool for priming diesel engines, removing fuel from fuel system components, sweeping diesel fuel tanks and transferring diesel fuel between storage tanks. DAVCO products are designed for tough commercial applications including On and Off-Highway, Industrial, Gen Set, Construction, Military and Marine.
Saline, Michigan (March 1, 2022) – DAVCO unveiled today the Fuel Pro 385/387/388 models, its latest all-in-one fuel filter, water separator, and fuel preheater for heavy-duty diesel that’s designed to fit Western Star, Volvo, Navistar and Mack Class 8 trucks. With the newest versions of the Fuel Pro joining the Fuel Pro 485/486/487 models, DAVCO three-layer filtration/ water separation technology is now available to work with heavy-duty diesel engines in the majority of Class 8 vehicles in North America.
DAVCO, the North American leader in fuel heater/water separators and filter systems for diesel-powered medium- and heavy-duty trucks, off-highway equipment and commercial marine applications, is owned by Southfield, Michigan-based Clarience Technologies, a global leader in advanced transportation technology that also includes Truck-Lite, RIGID and Lumitec advanced LED lighting, ECCO and Code-3 safety systems, and Road Ready advanced telematics.
Three-Layer Filtration Technology Ensures Maximum Efficiency
The hallmark of the latest Fuel Pro models is its three-layer filtration technology, ensuring the water separation functionality is maintained throughout the life of the filter. While this technology is not new to DAVCO – it was first introduced in the Fuel Pro 485/486/487 models in 2016 – this is the first time this technology will be available on Volvo Class 8 vehicles.
Customers can also choose to add an optional pre-heater, overnight heater and water-in-fuel sensor that will help start and keep the engine running in any weather conditions, based on their specific needs.
DAVCO now also offers fuel-blending as a next step in fuel heat for Class 8 units. While the optional fuel pre-heater and overnight heater on the Fuel Pro 385/387/388 are to aid at start up, the 388 was designed unlike anything available today, using diesel fuel itself instead of engine coolant to provide additional heat during operation. The use of fuel increases efficiency and takes in-operation fuel heat to a whole new level.
New and Improved Shop Pro is 44 Pounds Lighter, Smaller Without Sacrifice
Additionally, DAVCO has officially introduced the new and improved Shop Pro FXP 95, a model that has been redesigned to be 44 pounds lighter and 15 percent smaller than the previous version, improving customer ease-of-use without reducing performance.
Shop Pro FXP 95 also uses the latest three-layer filtration technology utilized in the Fuel Pro 385 model to strip water from outside the media with two inside stripping operations, including a coalescent layer and a hydrophobic layer. This ensures no water will pass the filter, particularly ultra-low sulfur and biodiesel, which have become difficult to separate.
DAVCO Develops Solutions that Fit the Needs of Customers Today, Tomorrow
In January, 2022, DAVCO announced a $3.5 million investment in its Saline, Michigan, campus to create an Advanced Electronics Manufacturing Center, extending its manufacturing capabilities into advanced electronics technologies that will become more prevalent with electric-powered commercial vehicles. The state-of-the-art facility sits adjacent to the existing DAVCO manufacturing facility and is expected to be fully operational this year.
Yet, given that most fleets will continue operating diesel-powered trucks for another decade or more, DAVCO remains committed to delivering industry-leading products for the diesel-powered truck market.
“With the industry’s attention on electric vehicles, today’s product announcements serve as a reminder that we remain committed to our diesel customers,” said Laurie Beegle, President at DAVCO. “Whether their products are powered by diesel or electric, commercial transportation fleets can continue to expect the same level of outstanding support they have always received from us.”
About DAVCO
DAVCO is the North American leader in Class 8 heavy-duty diesel-powered truck fuel-heater/water separators and filter systems. In addition to the popular Fuel Pro® line, DAVCO also produces the Diesel Pro® for medium trucks, Sea Pro® for marine applications, Industrial Pro® models for off-road applications and a line of industrial automatic oil replenishment systems, with regulators, slow flow meters, and fluid level switches. The Shop Pro is a multi-purpose shop floor and service truck tool for priming diesel engines, removing fuel from fuel system components, sweeping diesel fuel tanks and transferring diesel fuel between storage tanks. DAVCO products are designed for tough commercial applications including On and Off-Highway, Industrial, Gen Set, Construction, Military and Marine.
About Clarience Technologies
Clarience Technologies focuses on developing vehicle and fleet management technology innovations for the commercial vehicle, passenger car, recreational off-road machine and pleasure craft markets. Through our data and insights, we improve fleet management, streamline supply chain management and enhance safety on and off the road. Since our Truck-Lite brand introduced the first sealed marker light in 1955, our companies have unveiled a steady stream of innovations that have turned customers into long-term partners. Today, Clarience Technologies is a global company known for its quality and dedication to sustainability – and to providing the technologies that keep our world moving forward. Learn more at www.clariencetechnologies.com.
Designed for Class 8 Trucks, Fuel Pro 499 Delivers Better Engine Protection, Uptime
New Orleans, Louisiana (March 4, 2024) – DAVCO Technology, the North American leader in diesel fuel water separators and diesel fuel filtration systems, has introduced its new Fuel Pro® 499 model diesel fuel/water separator for Class 8 trucks. The new model features a higher filtration capacity which helps increase overall engine protection and improve uptime. The announcement came at a press conference held by DAVCO-parent Clarience Technologies at ATA’s Technology & Maintenance Council in New Orleans.
“We are proud to introduce the Fuel Pro® 499, the latest fuel/water separator to our Fuel Pro line,” said David Oliphant, Vice President, Sales, Marketing & Customer Service at DAVCO Technology. “With its advanced features and superior performance, it exemplifies our longstanding commitment to deliver innovative solutions driven by OEM requirements that exceed end customers’ expectations.”
The new DAVCO Fuel Pro® 499 increases diesel fuel filtration capacity by nearly 70% when compared to previous models, leading to both improved engine protection as well as better uptime due to less frequent service requirements. Additionally, DAVCO designed the Fuel Pro® 499 to provide in-operation return fuel heat, which makes this product ideal for vehicles operating in extreme weather conditions, providing reliable performance when it matters most.
DAVCO has incorporated its Seeing is Believing® technology into the new model which provides drivers with the ability to see when their fuel filter truly needs replacement, reducing maintenance cost and minimizing downtime. Additionally, the model features Elemax® filter technology which maximizes filter life by forcing fuel to the lowest point of unused media area, optimizing its efficiency and driving more engine uptime.
“The DAVCO Fuel Pro® 499 sets a new standard in diesel fuel filtration,” said Joe Schaffer, Director of Engineering at DAVCO Technology. “With its larger filter and enhanced particulate holding capacity, this model offers unparalleled filtration performance and uptime ensuring optimal engine protection in demanding operating conditions.”
About DAVCO: DAVCO is the North American leader in Class 8 heavy-duty diesel-powered truck fuel-heater/water separators and filter systems. DAVCO products include the Fuel Pro® and Diesel Pro® for commercial vehicles, Sea Pro® for marine applications, Industrial Pro® for off-road as well as a line of industrial automatic oil replenishment systems with regulators, slow flow meters, and fluid level switches. DAVCO is also a contract manufacturer of vehicle electronics solutions and is the exclusive manufacturer for Road Ready advanced trailer telematics. The company is based in Saline, Michigan. For more information, visit DAVCO.com.
About Clarience Technologies: Clarience Technologies is a global leader of visibility and safety technologies for transportation. Born from a collection of premium brands each with a long track record of innovation, its solutions include vehicle lighting, camera and vision systems, telematics and safety solutions that protect our world and our livelihoods by keeping people, assets and businesses safe, secure and productive. Its team of companies includes Truck-Lite, DAVCO, Road Ready, RIGID, Lumitec, ECCO, Code 3, Fleetilla, LED Autolamps, Pressure Systems International and Safe Fleet. For more information, visit www.clariencetechnologies.com.