Mercedes Mullins
Gelled diesel fuel is a common problem for diesel vehicles operating in colder climates. Diesel fuel contains paraffin wax, which crystallizes and thickens when temperatures drop, clogging fuel filters and lines and making the engine difficult or impossible to start. Luckily, there are several ways to thaw gelled diesel fuel lines and get your vehicle back on the road.
How to Thaw Gelled Diesel Fuel Lines
| Characteristics | Values |
|---|---|
| Prevention | Use a fuel additive/conditioner with anti-gelling properties, such as Opti-Lube, Stanadyne, Power Service, or Sno-Cat™. |
| Keep fuel tanks full to reduce the chance of condensation forming and freezing. | |
| Replace fuel filters regularly to prevent clogging. | |
| Treatment | Use a diesel fuel supplement or anti-gel additive, such as Quick Thaw, CleanBoost® Diesel Rescue Emergency De-Gel™, Opti-Lube Gel Melt, or Diesel 911. |
| Warm the fuel tank using a heater, such as a torpedo heater, and insulate with bales of hay or a tarp. | |
| Try heating the fuel filter with a heat gun or hair dryer. | |
| Consider replacing the fuel filter and pre-filling it with treated diesel fuel or a fuel additive. |
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What You'll Learn
Use a fuel additive
Using a fuel additive is one of the best ways to fix gelled diesel fuel. Fuel additives are designed to re-liquefy gelled fuel and prevent it from occurring in the first place by lowering the temperature at which the fuel solidifies.
There are several fuel additives on the market that can help with this issue, such as CleanBoost® Diesel Rescue Emergency De-Gel™, which instantly goes to work on re-liquefying gelled diesel fuel and can be used with all diesel fuels. Quick-Thaw is another option that will completely restore your entire fuel system in about 20 minutes when used according to directions. It is safe to use with any engine components and emissions control equipment. Opti-Lube, Stanadyne, PowerService, and Lucas are other good brands of fuel additives with anti-gel properties.
To use a fuel additive to fix gelled diesel fuel, follow these steps:
- Check the fuel tank and fuel filter(s).
- If the fuel is gelled in the tank, add the recommended amount of fuel additive to the tank. As a general rule of thumb, use a ratio of about 1 ounce of additive for every 10 gallons of fuel already in the tank.
- If the fuel is gelled in the filter, remove the filter and pour up to four ounces of fuel additive onto the filter element.
- Wait for the additive to work (this can take up to 45 minutes).
- Replace the fuel filter and any other parts you may have disassembled.
- Prime the diesel fuel system.
- Start the engine and let it run for a few minutes to heat up and thaw out.
It is important to note that while fuel additives can be very effective in fixing gelled diesel fuel, preventing the issue from occurring in the first place is always the best course of action. This can be done by using winter blends, keeping your fuel tanks full, and regularly replacing fuel filters.
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Try a fuel conditioner
If you're dealing with gelled diesel fuel lines, one solution is to use a fuel conditioner or additive. Fuel conditioners are designed to prevent diesel fuel from gelling and can be used in winter and other seasons. They are also safe to use with any engine components and emissions control equipment.
There are several fuel conditioners on the market that can help with gelled diesel fuel lines. One option is Diesel Treat by Howes Products, which is North America's number one selling anti-gel and fuel conditioner. It is safe to use, even in the coldest climates, as it does not contain any alcohol or harmful solvents. It is also effective in all diesel and biodiesel fuels, including home heating oil, and can be used for trucks, cars, boats, and large equipment.
Another option is CleanBoost® Diesel Rescue Emergency De-Gel™, which can instantly re-liquefy gelled diesel fuel and thaw frozen fuel filters. It can be used in all diesel fuels, including ULSD, and can help prevent fuel filter icing while removing water from the fuel system.
A third option is Diesel 911, which is a winter emergency product that can reliquefy gelled fuel and de-ice frozen fuel filters. It is important to note that Diesel 911 does not prevent fuel gelling, so it should be used in conjunction with a fuel additive or conditioner with anti-gelling properties.
When using a fuel conditioner or additive, be sure to follow the instructions on the product label and take any necessary precautions. Additionally, it is recommended to have these products on hand and ready to deploy before you encounter gelled diesel fuel lines, as prevention is always better than cure.
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Warm the fuel tank
Warming the fuel tank is a key part of the process of un-gelling diesel fuel. The gelled diesel can be thawed out by raising the temperature above the fuel's gel point, which is around 20°F (-7°C). This can be achieved by moving the vehicle to a warmer place, such as a heated garage, or by using a heater.
One option is to use a torpedo heater, such as a propane heater, placed under the tank. Bales of hay or a tarp can be used to retain the heat around the engine and fuel tank. It may take some time for the heat to penetrate and thaw the entire line from the fuel tank to the filter and injectors.
Another method is to use a barrel with the bottom cut off, filled with sand and diesel/kerosene, and lit to provide a source of heat. This method should be approached with caution, as it involves an open flame.
A further option is to use a block heater, which connects to the engine and warms the engine's coolant, keeping the oil warm and preventing freezing.
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Replace the fuel filter
To replace the fuel filter, you will first need to locate it. The primary fuel filter is typically located between the vehicle's fuel tank and engine, and the secondary fuel filter is usually found near the engine. You may need to jack up your car to easily access the fuel filter. Place a container underneath the old filter to prevent any spillages from excess fuel.
The next step is to remove the clips holding the fuel filter in place. Most fuel filters are held in place by two plastic clips. Locate the clips on either side of the cylindrical fuel filter, then use a flat-head screwdriver to pop them out of the holes. These clips may break as you remove them, so purchasing replacement clips along with your new fuel filter is advised.
With the clips removed, slide the fuel lines away from the filter to pop them off the nozzles on either end. If your filter sits in the bracket differently, you may need to slide it toward the back of the car to remove it. Some fuel filters under the hood may be held in a bracket with a bolt that will need to be removed to slide the filter out.
Now, you can drop the new filter into the housing and fill it with fresh, clean fuel. Smear some clean fuel onto the surfaces of the new gasket and O-rings before reseating them into their respective grooves. Replace the cap, making sure the filter housing is correctly seated in the groove. Then, screw down the T-handle, complete with a new O-ring, tightening it by hand.
Finally, turn your attention to the secondary filter. The secondary filter is usually mounted on the engine and close to, and immediately after, the lift pump. The engine-mounted secondary filters are on the pressure side of the lift pump, while the primary filters are on the suction side. You may need a square drive or socket to loosen the cap on the secondary filter.
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Use a professional service
If you're not confident in tackling the issue of gelled diesel fuel lines yourself, it may be best to enlist the help of a professional service. This can save you time, money, and hassle in the long run, especially if you're stranded in the middle of nowhere.
Professional services have the necessary tools and expertise to quickly and effectively resolve the issue. They can provide emergency call-outs to thaw gelled diesel fuel systems, which can be a complex and challenging process. The cost of these call-outs can vary depending on the severity of the issue and your location, ranging from a few hundred to a few thousand dollars. However, it's important to note that this cost may be lower than the potential business loss caused by a stalled truck.
One such professional service is CleanBoost®, which offers a product called Diesel Rescue Emergency De-Gel™. This product is designed to instantly re-liquefy gelled diesel fuel and thaw frozen fuel filters. It is effective in all diesel fuels, including ultra-low-sulfur diesel (ULSD). CleanBoost® provides detailed instructions on using their product, and it can be used in a matter of minutes.
Another professional-grade product is Quick Thaw, a 32 oz. restoring treatment for gelled diesel fuel. It is safe to use with any engine components and emissions control equipment and does not contain harmful alcohols. Quick Thaw can completely restore your entire fuel system in about 20 minutes when used according to the directions. This product is ideal for diesel vehicles operating in colder climates where ambient temperatures can cause filter-plugging issues.
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Frequently asked questions
The best way to solve this problem is to prevent it from happening in the first place. Fuel additives with anti-gel properties are a good solution. Good brands of fuel additives include Opti-Lube, Stanadyne, Power Service and Lucas.
You can prevent gelling by using winter blends and priming your fuel beforehand with a fuel conditioner like Sno-Cat™.
CleanBoost® Diesel Rescue Emergency De-Gel™ can instantly re-liquefy gelled diesel fuel. Quick Thaw is another product that can restore frozen gas fuel lines in cold weather in about 20 minutes.
Some DIY ways to fix gelled diesel fuel lines include using a torpedo heater under the tank and putting bales of hay around the truck to retain the heat. Putting a tarp over the engine as it is being heated is another option.
If you can’t start your diesel after a colder-than-usual night, or if the engine is running rough and with low power, you might be experiencing fuel gelling.
