Sylvie Willis
Gelled diesel fuel is a common problem for diesel vehicle owners during winter. Diesel fuel contains paraffin wax, which solidifies into a gel-like substance when temperatures drop to around 20°F (-7°C). This can clog fuel filters and lines, affecting the engine's performance and making it difficult to start. While the issue can sometimes be resolved by simply moving the vehicle to a warmer location, there are also various products available that can be added to the fuel tank to help thaw and restore the fuel system. Additionally, preventive measures, such as using fuel additives and winterized diesel blends, can be taken to minimize the risk of gelling.
How to thaw gelled diesel fuel
| Characteristics | Values |
|---|---|
| Cause | Gelled diesel fuel is caused by low temperatures. Diesel contains paraffin wax, which crystallises and thickens when temperatures drop. |
| Prevention | Use a fuel additive/conditioner with anti-gelling properties, such as Sno-Cat™. Replace fuel filters regularly, and keep fuel tanks full to prevent condensation. |
| Treatment | Warm the fuel tank using a torpedo heater or a kerosene fire. Use products like Opti-Lube Gel Melt, Quick Thaw, or CleanBoost® Diesel Rescue Emergency De-Gel™ to liquefy gelled fuel. |
| Emergency Measures | Take the vehicle to a shop for heating. Try DIY methods like using a barrel with sand and kerosene/diesel, or a propane heater with bales of hay. |
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What You'll Learn
Use a fuel additive
Gelled diesel fuel can be a major inconvenience, but it can be resolved by using a fuel additive. Fuel additives are designed to lower the temperature at which the fuel solidifies, break up existing gelled fuel, and improve cold-weather performance. Opti-Lube Winter Formula, for instance, can keep diesel fuel from gelling up to -50°F/-45°C. Other options include Stanadyne, PowerService, Lucas, Diesel 911, CleanBoost® Diesel Rescue Emergency De-Gel™, and Quick Thaw.
It is important to choose a high-quality additive specifically designed for diesel fuel. The typical dose for a fuel additive is about 0.15%, but it is important to follow the dosing instructions on the product. Some additives, like Opti-Lube Gel Melt, can be added directly to the fuel filter if it has a cap or priming screw.
In addition to using a fuel additive, it is recommended to replace the fuel filter regularly, as a dirty fuel filter will gel more easily than a clean one. Contaminants in the fuel can also increase the likelihood of gelling, so keeping your fuel tanks full can help reduce the chance of condensation forming and freezing, which can lead to gelling.
Using certain substances as additives, such as gasoline, ethanol, isopropyl, or methanol, should be avoided as they can lower the flash point of the fuel and damage pumps and injectors. It is also important to note that an additive may not dissolve well in cold fuel, so heating the mixture to around 80-100°F can help dissolve wax buildup more quickly.
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Try a torpedo heater
If you're looking to thaw gelled diesel fuel, a torpedo heater is a great option. Torpedo heaters are effective in warming up fuel tanks and can run on different types of fuel, including kerosene, diesel, and fuel oil. They are commonly used to thaw frozen machinery as they direct heat to a specific target, making them ideal for quickly warming up gelled diesel fuel.
When using a torpedo heater to thaw gelled diesel fuel, it is important to keep a few things in mind. Firstly, torpedo heaters can produce strong fumes, especially when using diesel fuel. Therefore, it is recommended to use kerosene or fuel oil if possible, as they burn cleaner and produce less odour. If you must use diesel, ensure that the area is well-ventilated to avoid any health risks associated with the fumes.
Additionally, when using a torpedo heater, it is crucial to maintain a safe distance from the fuel tank. Keep the heater a few feet away from the tank to avoid any potential fire hazards. It is also important to be cautious when aiming the heater, as you don't want to melt any plastic components or fuel lines.
To optimise the performance of your torpedo heater, you may need to adjust the pump pressure, especially if you're using diesel fuel. Refer to the user manual or the labels on the machine for instructions on how to do this. By adjusting the pump pressure, you can reduce fuming and improve the efficiency of the heater.
Torpedo heaters are a powerful tool for thawing gelled diesel fuel. With their ability to run on different types of fuel and direct heat to specific targets, they can effectively warm up fuel tanks and degel diesel fuel. However, it is important to prioritise safety and ventilation when using these heaters to avoid any potential hazards.
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Warm the fuel tank
Warming the fuel tank is a common method to thaw gelled diesel fuel. This can be done in several ways. One way is to use a propane torpedo heater, which is placed under the tank and left on low for a few hours. Bales of hay can be placed around the truck to retain the heat. Alternatively, a tarp can be put over the engine to trap the heat. Another method is to use a barrel, cut off the bottom 4 to 5 inches, fill it with sand and diesel/kerosene, and light it up to create a source of heat.
A block heater can also be used to warm the fuel tank. This is connected to the engine and warms the engine's coolant, keeping the oil warm and preventing freezing. Additionally, storing the vehicle in a heated environment, such as a climate-controlled garage, can help prevent the fuel from gelling.
If the fuel is gelled in the tank, it is recommended to add a diesel fuel additive, such as Diesel Winter Rescue, to the tank. This helps dissolve the gel and return the fuel to a liquid state. The engine can then be started and allowed to idle to warm up the fuel system and clear any remaining gelled masses.
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Use a kerosene fire
If you're dealing with gelled diesel fuel in a vehicle or storage tank, one way to thaw it is by using a kerosene fire. Here's a step-by-step guide on how to do it safely and effectively:
Firstly, ensure you have all the necessary safety gear, including eye protection, heat-resistant gloves, and a fire extinguisher nearby in case of emergencies. You will need to create a controlled fire to heat the gelled diesel, and kerosene is a good fuel source for this. Prepare a safe, open area where you can work, away from any flammable structures or materials.
Pour kerosene into a fire-resistant container, such as a metal drum or a large, deep tray. The amount of kerosene you use will depend on the size of your diesel fuel container and the severity of the gelling. Ensure there is enough kerosene to create a sustained fire for several minutes. Place the kerosene-filled container below the diesel fuel tank or vehicle, ensuring it is on a stable, level surface. You want the heat from the fire to rise and warm the gelled diesel above.
Ignite the kerosene to start the fire, being cautious to avoid any spillage or splashing of the kerosene. Let the fire burn for several minutes, heating the diesel fuel container. You should see the diesel fuel begin to thaw as the heat melts the gelled portions. Use a thermometer to monitor the temperature, aiming for around 40-50 degrees Fahrenheit to ensure the diesel is fully liquid again.
Once the diesel fuel has returned to a liquid state, carefully extinguish the kerosene fire. You can now safely use or transfer the diesel fuel as needed. Always take great caution when handling flammable liquids and open flames, and ensure you dispose of any flammable materials used in a safe and responsible manner.
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Add Opti-Lube Gel Melt
Opti-Lube Gel Melt is a useful product to have on hand to deal with gelled diesel fuel in an emergency. It is designed to cut through gel and ice in cold weather emergencies. The additive can be used to de-ice frozen fuel filters and to reliquify gelled fuel.
To de-ice frozen fuel filters, first check that the fuel is liquid in the fuel tanks but that the engine won't start. Then, remove the fuel filters and fill them with 50% Gel Melt and 50% fresh diesel fuel. Reinstall the filters and start the engine. You can then add Opti-Lube Winter or XPD All-In-One as directed to prevent further gelling.
To reliquify gelled fuel, add approximately 1oz of Gel Melt to every 3 gallons of fuel in the tanks. Then, remove the fuel filters and fill them with 50% Gel Melt and 50% fresh diesel fuel. Reinstall the filters and start the engine, allowing it to idle to warm up the fuel system. As before, you can then add Opti-Lube Winter or XPD All-In-One as directed to prevent further gelling.
Opti-Lube Gel Melt can also be added directly to the filter. This may be necessary if your filter is clogged with gelled diesel fuel. If your filter has a cap or priming screw, you can add Gel Melt directly to the filter. If this doesn't work, or if your filter is sealed, you will need to replace it.
Opti-Lube Gel Melt is available in 1-quart bottles, which treat up to 100 gallons of fuel. The treatment rate is a minimum of 1 to 400 (1 ounce per 3.3 gallons of fuel). For 10 gallons of fuel, use 3oz or more, for 20 gallons use 6oz or more, for 40 gallons use 12oz or more, for 60 gallons use 18 or more, and for 80 gallons use 24oz or more.
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Frequently asked questions
Diesel fuel gelling occurs when the fuel turns into a hard, paste-like wax due to low temperatures, typically below 32°F (-7°C). This can clog fuel filters and lines, affecting the engine's performance and making it difficult to start.
To prevent diesel fuel gelling, you can use a winterized blend of diesel fuel or add a fuel additive/conditioner with anti-gelling properties. Replacing fuel filters regularly and keeping fuel tanks full can also help prevent gelling.
If your diesel fuel has gelled, you can try to warm the fuel tank using a torpedo heater, or by creating a small fire under the engine. You can also use fuel additives like Opti-Lube Gel Melt, Quick Thaw, or CleanBoost Diesel Rescue Emergency De-Gel to help liquefy the gelled fuel.
Yes, Sno-Cat is a fuel additive that can be used to prevent and fix diesel fuel gelling. It helps break up existing gelled fuel and improves cold-weather performance.
If your diesel vehicle is experiencing rough engine operation or low power, or if it is difficult to start, especially during winter, gelled fuel may be the problem.
