Rajan Wilcox
Diesel fuel gelling is a common issue for truck drivers in cold climates. Gelling occurs when the paraffin in diesel solidifies as temperatures drop, causing wax crystals to form and clog the fuel tank, lines, and filters. This can hinder the engine's operations, resulting in reduced engine power and, in some cases, complete engine shutdown. To prevent gelling, truck drivers can use winterized diesel, add anti-gel additives, or maintain their vehicles by keeping them in heated storage or using engine block heaters. While gelling can be reversed using products like Diesel 911, taking preventive measures is crucial to avoid the inconvenience and potential damage caused by gelled diesel fuel.
Will a diesel truck turnover if the fuel is gelled?
| Characteristics | Values |
|---|---|
| Fuel gelling occurrence | When the paraffin in diesel solidifies at low temperatures |
| Temperature range | 32°F to 10°F to 15°F |
| Symptoms | Engine idling, low power, loud noises, inability to reach high speeds, white/blueish smoke from exhaust, low gas mileage, clogged fuel filters |
| Prevention | Use winterized diesel, add anti-gel additives, store vehicle in a heated environment, use engine block heaters, maintain over half-full fuel tank, add kerosene to diesel fuel |
| Treatment | Opti-Lube Gel Melt, Diesel 911, replace fuel filters, heat fuel filters |
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What You'll Learn
Preventing diesel fuel gelling
Gelling of diesel fuel is a common problem in cold temperatures, as the paraffin wax present in the fuel can solidify, clogging filters and fuel lines. This can cause the vehicle to not start or run properly. To prevent this, there are several measures that can be taken:
Use Winterized Diesel or Kerosene-Blended Diesel
Winterized diesel, also known as "cold weather" diesel, has a lower wax content and is designed to remain liquid at lower temperatures. This type of diesel is specifically created to prevent gelling and is available at select gas stations during the winter months. Kerosene-blended diesel, which combines #1 diesel and #2 diesel, can also be used as it has a lower gelling point than regular diesel. However, it may lead to reduced fuel mileage and efficiency.
Maintain Fuel Tank Levels
It is recommended to keep the fuel tank more than half full, as a nearly empty tank is more susceptible to condensation and water accumulation, which can contribute to fuel gelling.
Utilize Fuel Additives
Additives such as anti-gel and flow improvers can be added directly to the fuel tank before filling up. These additives lower the gelling point, improve fuel flow, and reduce the formation of crystals. It is advisable to carry several bottles of anti-gel additives in your vehicle.
Store Vehicle in a Controlled Environment
Parking your vehicle in a climate-controlled garage or heated environment can help protect it from freezing outdoor temperatures. This method ensures that the fuel and engine remain warm, reducing the likelihood of gelling.
Maintain Clean Fuel Filters
Ensuring that your fuel filters are clean and functional is crucial. Clogged filters can restrict fuel flow and contribute to gelling. It is recommended to carry spare filters in your vehicle, especially when travelling to extremely cold locations.
Monitor Outdoor Temperatures
Gelling typically occurs when temperatures fall below 10 to 15 degrees Fahrenheit (-12 degrees Celsius). Keeping track of the temperature can help you anticipate and prepare for potential gelling issues.
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Symptoms of gelled diesel fuel
Gelled diesel fuel can cause a vehicle to stop running. The term "gelling" refers to the process of diesel fuel turning into a hard, paste-like wax that cannot be pumped into fuel lines, pumps, or injectors. Gelling typically occurs when the temperature of the fuel drops, causing the wax naturally found in the fuel to crystallize. This can happen at temperatures as high as 20°F (-6°C), depending on the source and quality of the fuel. Biodiesel, for example, tends to gel at higher temperatures than conventional diesel.
The symptoms of gelled diesel fuel include difficulty starting the engine or the engine stopping during operation in cold temperatures. The vehicle may feel sluggish in cold weather, with reduced acceleration and overall performance. When accelerating, there may be a significant difference between the desired fuel rail pressure and the actual rail pressure, with the actual pressure staying lower than expected.
To determine if gelling has occurred, it is recommended to check the fuel tank and fuel filter(s). If gelling is suspected, preventative measures such as using fuel additives and winter blends can be taken to mitigate the issue. Fuel additives with anti-gel properties, such as Opti-Lube, Stanadyne, PowerService, Lucas, and Hot Shot's Secret Diesel Winter Anti-Gel, are effective in preventing and treating gelled fuel. Additionally, it is advised to use a clean fuel filter and to replace it regularly, as a dirty filter is more susceptible to gelling.
If the fuel has already gelled, there are several options for addressing the issue. One method is to warm the fuel tank using a hair dryer or heat gun. Another option is to use a de-gel product, such as Opti-Lube Gel Melt, Diesel 911, or Hot Shot's Secret Diesel Winter Rescue, which is designed to re-liquefy gelled fuel. In some cases, it may be necessary to replace the fuel filter and fill it with a mixture of diesel winter rescue and diesel fuel before reinstalling and warming up the engine.
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Reversing the gelling process
Gelled diesel fuel can cause blockages in the fuel lines and fuel filter, preventing fuel from reaching the engine. This can cause the engine to stop running and the vehicle to experience sluggish acceleration and overall reduced performance. If your diesel truck has gelled fuel, there are several ways to reverse the gelling process and restore its functionality.
Firstly, it is crucial to act promptly and start by examining and replacing the fuel filter, as the gel may have spread to other components. Additionally, check the fuel tank and drain water separators. To ensure your safety, wear thick gloves to avoid potential bacteria growth in diesel fuel.
If your fuel has already gelled, using a de-gel product is a practical option when visiting a mechanic is impractical. De-gel products are different from anti-gel products, which are ineffective on already-gelled diesel. De-gel products can be added to the fuel tank and filters to reverse the gelling process.
Another way to reverse the gelling process is by using heat. You can move your truck to a warmer garage or use a fuel heater to warm the fuel directly. Engine block heaters are electrical devices that keep the engine warm even when the vehicle is not in use, providing an energy-efficient way to safeguard against diesel fuel gelling.
If your truck has stopped running due to gelled fuel, you can use kerosene to thaw the tank, fuel filter, and frozen lines. Kerosene has a lower gelling point than diesel fuel, so mixing it with diesel fuel can lower the freezing point. However, kerosene has disadvantages such as reduced fuel mileage and efficiency.
To prevent diesel fuel gelling in the future, you can use winterized diesel, which has a lower gelling temperature. Maintaining a full or at least half-full fuel tank can also reduce the risk of water or condensation collecting and causing diesel fuel to gel. Additionally, keeping your vehicle in a climate-controlled garage or heated environment can help protect it from freezing outdoor temperatures.
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Using kerosene to prevent gelling
Diesel fuel gelling is a common issue in colder climates, which can cause significant disruption to your vehicle's performance and ability to start. Gelling occurs when the paraffin wax in diesel starts to solidify as temperatures drop, causing the fuel to thicken and eventually clog the tank, fuel lines, and filters. This can lead to a complete loss of engine power.
To prevent this issue, one common solution is to use kerosene, which has a lower gelling point than diesel fuel. By mixing kerosene with diesel, you can lower the freezing point of the fuel mixture. This is done by blending #1 diesel (kerosene) with #2 diesel at a ratio of 50:150. Kerosene-blended fuel is also available at some fuel suppliers, providing a convenient option for users.
While kerosene is effective in preventing gelling, it is important to consider its disadvantages. Kerosene can lead to reduced fuel mileage and efficiency. Additionally, if your truck has already stopped running due to gelling, using kerosene will require a significant amount of time for the kerosene to thaw the tank, fuel lines, and filters. It may take up to an hour of idling for the kerosene to effectively thaw the entire system. Therefore, it is highly recommended to let the engine run long enough to properly combine the fuels and ensure a steady flow of the mixture.
In addition to kerosene, there are other preventive measures you can take to avoid diesel fuel gelling. One option is to use a winter diesel fuel additive, which can prevent the paraffin wax from solidifying and provide other benefits such as improved cold engine starts. Maintaining a full or at least half-full fuel tank can also help reduce the risk of water or condensation collecting and causing gelling. Storing your vehicle in a heated garage or using an engine block heater can keep the engine warm and protected from freezing temperatures.
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Fuel additives and anti-gel treatments
Diesel fuel gelling occurs when the paraffin or wax in diesel fuel starts to solidify as temperatures drop. This crystallization impedes the flow of fuel to the engine, potentially clogging fuel lines and filters. Gelling typically occurs when temperatures fall below 10 to 15 degrees Fahrenheit or -12 degrees Celsius, though it can begin as early as 32 degrees Fahrenheit.
To prevent fuel gelling, diesel truck drivers can use fuel additives and anti-gel treatments. These products work by changing the properties of the fuel, allowing it to withstand colder temperatures. One such additive is Hot Shot's Secret's EDT+ Winter Defense. Diesel Treat by Howes Products is another popular option, known for its effectiveness in preventing gelling and improving engine performance. It is essential to use these additives consistently to maintain the health of your engine.
Kerosene is also commonly used to prevent diesel fuel gelling. Due to its lower gelling point, kerosene can be mixed with diesel fuel to lower its freezing point. However, this method may result in reduced fuel mileage and efficiency. Additionally, it is crucial to let the engine run long enough to properly combine the fuels and ensure a steady flow of the mixture.
Another preventive measure is to use winterized diesel, which is designed for colder weather and has a lower gelling temperature. Maintaining a full or at least half-full fuel tank can also reduce the risk of water or condensation collecting and causing diesel fuel to gel. For more permanent solutions, consider investing in an engine block heater to keep your engine warm even when the vehicle is not in use.
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Frequently asked questions
Diesel fuel gelling occurs when the paraffin usually present in diesel starts to solidify when the temperature drops. At 32 degrees Fahrenheit, the wax in liquid form will crystallize and leave the fuel tank clouded. At 10-15 degrees Fahrenheit, it will finally start to gel and clog the tank and fuel filters.
To prevent diesel fuel gelling, you can mix kerosene with diesel fuel or use a bottle of Antigel. You can also use Diesel 911 to reverse the gelling. Additionally, maintaining a full or at least half-full fuel tank can help reduce the risk of water or condensation collecting and causing diesel fuel to gel.
Some signs that your diesel fuel has geled include worsened vehicle performance, a decrease in gas mileage, white smoke from the exhaust, and black smoke from the tailpipe.
