Mercedes Mullins
Gelled diesel fuel is a common issue for diesel vehicles in cold climates. The paraffin wax in diesel fuel can thicken and harden in cold temperatures, causing fuel filters and pumps to become clogged and preventing engines from running. This issue can be prevented by storing vehicles in heated areas, adding anti-gel products to fuel tanks, and using fuel additives. If gelling does occur, there are several solutions, including heating the fuel filter or adding products like Opti-Lube Gel Melt and Diesel 911 directly to the fuel tank or filter. It is important for diesel vehicle owners to be aware of these issues and solutions to maintain the functionality of their vehicles in cold weather.
Dealing with gelled diesel fuel
| Characteristics | Values |
|---|---|
| Cause | Gelling of diesel fuel occurs in winter conditions due to low temperatures. |
| Prevention | Add a winter fuel, anti-gel, or cold flow improver additive to the diesel fuel tank. Store the vehicle in a heated area. |
| Treatment | Use products like Opti-Lube Gel Melt, Diesel 911, CleanBoost® Diesel Rescue Emergency De-Gel™, or FPPF Polor Power. Heat the fuel filter with a heat gun or hair dryer. |
| Maintenance | Buy good-quality diesel fuel. Keep a bottle of Gel Melt and an extra fuel filter in your vehicle. |
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What You'll Learn
Prevention: Use anti-gel treatments and fuel additives
To prevent diesel fuel from gelling, anti-gel fuel supplements can be used. Anti-gel additives are easy to use – simply top off your fuel tank with the treatment. They work by lowering the freezing point of diesel fuel, making it less likely to freeze in cold temperatures. Diesel contains a waxy substance called paraffin, which can solidify and cause the fuel to turn into a thick, sludgy gel. Anti-gel additives lower the Cold Filter Plugging Point (CFPP), which is the lowest temperature at which fuel will flow through a specific filter.
Anti-gel additives are different from de-gel products, which are added after the diesel has solidified. It is important to start using anti-gel additives as soon as temperatures approach freezing. The rule of thumb is that the lower the temperature, the more fuel additive needs to be added. It is also a good idea to add more anti-gel additive in preparation for a rapid drop in temperature. Anti-gel additives will not damage your engine, so it is better to use extra when in doubt.
Some examples of anti-gel additives include Howes Diesel Treat, Lucas Anti-Gel, Amsoil Cold Flow, and Power Service Diesel Kleen. Howes Diesel Treat is a popular choice in North America and is trusted by many diesel vehicle owners. It is safe to use and does not contain any alcohol or harmful solvents. It is also guaranteed to work and will not void any manufacturer warranties. Lucas Anti-Gel is another effective option, with users reporting that it has saved them gas and kept their vehicles running smoothly.
In addition to anti-gel additives, cold flow improvers can also be used to prevent diesel fuel from gelling. These need to be added while the fuel is still liquid. Engine block heaters and preheaters can also help with starting and running your vehicle in cold temperatures, but they will not be effective if you already have a tank full of gelled diesel.
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Treatment: Use de-icers and anti-gel products
Gelled diesel fuel can be a real headache, but there are ways to deal with it. One way to treat gelled diesel fuel is to use de-icers and anti-gel products. These products can help to liquefy gelled diesel and prevent it from happening again.
De-icers and anti-gel products are designed to lower the freezing point of diesel fuel, preventing it from turning into a gel-like substance. This is especially useful in cold climates, where diesel fuel is more prone to gelling. By adding these products to your fuel tank, you can help ensure that your diesel fuel remains in a liquid state and can flow properly through your engine.
It's important to note that there are different types of anti-gel products available, and not all of them are created equal. Some anti-gels may only lower the freezing point by a few degrees, while others can provide a more significant drop. It's also worth mentioning that anti-gel treatments typically combine different active ingredients to address the various reasons why diesel fuel gels.
One trusted option is Howes Diesel Treat, which is an anti-gel and fuel conditioner. Diesel Treat is designed to prevent gelling in even the coldest temperatures and is safe to use due to its petroleum-based ingredients. It does not contain any alcohol or harmful solvents, so you don't have to worry about it damaging your engine. Diesel Treat also offers added benefits, such as providing lubricity, preventing deposits, and improving fuel efficiency.
Another option to consider is Lucas Anti-Gel, which is designed to prevent fuel thickening and gelling. Depending on the temperature, you may need to adjust the amount of Lucas Anti-Gel you use. For temperatures above -10°F, one bottle is recommended for every 150 gallons of diesel fuel. For temperatures below -10°F, a second bottle is suggested.
Using de-icers and anti-gel products is an effective way to treat gelled diesel fuel and prevent it from occurring in the future. These products can help ensure that your diesel fuel remains in a liquid state and can flow properly through your engine, even in cold climates.
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Fuel filters: Heat or replace clogged filters
Gelled diesel fuel is a common issue faced by diesel vehicle owners, especially in cold weather. The problem arises when diesel fuel is exposed to low temperatures, causing it to turn into a gel-like or waxy substance. This can clog fuel filters and lines, leading to reduced fuel efficiency and, in some cases, rendering the engine impossible to start.
To address this issue, there are several options to consider:
Heating the Filter
One approach is to try heating the fuel filter to melt the gelled diesel. This can be done carefully with a heat gun or a hair dryer. If the filter has a cap or a priming screw, adding a product specifically designed to melt gelled fuel, such as Opti-Lube Gel Melt or Diesel 911, can be effective. These products are added directly to the filter, following the manufacturer's dosing instructions, and they work to break down the gelled fuel without the need for additional heat.
Replacing the Filter
If heating or treating the filter is not effective or if the filter is sealed, replacing it may be necessary. It is recommended to have an extra fuel filter on hand in the vehicle. The new filter should be pre-filled with treated diesel fuel or a straight fuel additive to ensure that the treatment reaches the fuel pump and lines quickly. This can help prevent future gelling issues and improve the overall performance of the engine.
Using Fuel Additives
Another strategy to address gelled diesel fuel is to use fuel additives with anti-gelling properties. These additives work by lowering the temperature at which the fuel solidifies, breaking up existing gelled fuel, and improving cold-weather performance. It is important to choose high-quality additives specifically designed for diesel fuel, such as Opti-Lube, Stanadyne, Power Service, or Lucas. Adding these additives to the fuel tank can help prevent and treat gelled fuel issues.
Keeping the Fuel Tank Full
Maintaining a full fuel tank can also help prevent diesel fuel from gelling. When the tank is full, there is less space for water or condensation to collect, reducing the chances of gel formation. Keeping the tank more than half full is generally recommended.
Storing the Vehicle in a Warm Environment
Parking your vehicle in a garage or an indoor parking lot during cold weather can help prevent diesel fuel from gelling. The warmer environment can keep the fuel above its gel point, ensuring it remains in a liquid state. Additionally, using an engine block heater, an electrical device plugged into the engine, can help keep the engine warm even when the vehicle is not in use.
In summary, dealing with gelled diesel fuel in fuel filters involves a combination of preventative measures, such as using fuel additives and keeping the fuel tank full, and reactive measures, such as heating or replacing the fuel filter. Taking these steps can help ensure the proper functioning of the fuel system and maintain the performance of diesel engines in cold weather conditions.
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Storage: Keep vehicles in heated areas
Gelled diesel fuel is a common issue for vehicles in cold weather. This occurs when the paraffin wax in diesel fuel thickens in low temperatures, causing the fuel to solidify. This can prevent the engine from running and clog fuel pumps, filters, lines, and injectors.
To prevent diesel fuel from gelling, it is important to store vehicles in heated areas during the winter months. Gelling typically occurs when a fuel tank has been sitting dormant in cold temperatures for an extended period. By storing your vehicle in a heated garage or warehouse, you can maintain a warmer temperature for your fuel tank, preventing the fuel from solidifying.
Additionally, it is recommended to use winter diesel blends or add a diesel fuel supplement or anti-gel to your tank. These products alter the temperature at which gelling occurs, requiring much colder conditions for the fuel to gel. Anti-gel treatments typically contain different active ingredients that address the various factors contributing to diesel fuel gelling. It is important to note that anti-gel products must be added before the cloud point of the fuel, which is the temperature at which the wax crystals start to form.
In extreme cold conditions, you can also consider mixing kerosene with your diesel fuel. Kerosene (#1 diesel fuel oil) dilutes the paraffin, effectively lowering the temperature at which the diesel fuel solidifies. However, it is important to exercise caution when adding kerosene, as it can affect the performance and longevity of modern diesel engines.
By following these storage and fuel treatment practices, you can effectively prevent gelled diesel fuel and maintain the functionality of your vehicle during the winter season.
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Alternatives: Try kerosene or gas in extreme cold
Gelled diesel fuel is a common issue faced by diesel engine users during winter. This occurs when the paraffin wax in diesel fuel thickens in cold temperatures, eventually clogging the fuel filter and preventing the engine from running. While there are various ways to prevent and address this issue, such as using anti-gel treatments, an alternative solution is to use kerosene or gas.
Kerosene, also known as #1 diesel fuel oil, is a common alternative to anti-gels or cold flow improvers. It does not possess any magical chemical properties but simply dilutes the paraffin wax in diesel fuel. This dilution results in a lower cold filter plug point, reducing the temperature at which the wax solidifies and clogs the fuel filter. The extent of temperature reduction depends on the percentage of kerosene blended with diesel fuel. For every 10% of kerosene added, you can expect a decrease in the gelling temperature by approximately 3 to 4 degrees. Therefore, to achieve a significant drop in temperature, a higher proportion of kerosene may be required, which can lead to a loss of mileage due to kerosene's lower energy value.
Another factor to consider when choosing between kerosene and anti-gels is the desired level of temperature drop. Anti-gels or cold flow improvers are designed to lower the cold filter plug point by 15 to 20 degrees, whereas kerosene may require a higher volume to achieve the same result. As a result, anti-gel treatments are often more cost-effective than kerosene dilution. However, it is important to note that anti-gel treatments must be added before the fuel reaches cold temperatures, as they cannot reverse gelled fuel.
In extreme cold conditions, kerosene may be a more readily available option compared to anti-gels, and it does not require any additional mixing or heating procedures. Many winter climate fuel suppliers offer diesel fuel that is pre-mixed with kerosene for added convenience.
While kerosene and anti-gels are effective in preventing and addressing gelled diesel fuel, it is essential to consider the specific needs and limitations of your diesel engine. Additionally, storing your vehicle or engine in a heated area during winter can also help prevent fuel gelling.
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Frequently asked questions
If you can't start your diesel engine after a colder-than-usual night, or if the engine is running rough and with low power, you might be experiencing fuel gelling.
You can prevent diesel fuel from gelling by adding a winter fuel or anti-gel additive to your tank. You can also store your vehicle in a heated area during the winter months.
If your diesel fuel has gelled, you can try using a product designed to fix gelled fuel, such as Opti-Lube Gel Melt or Diesel 911. Simply add the product to your tank following the dosing instructions. Alternatively, you can try carefully heating the filter with a heat gun or hair dryer.
Diesel fuel contains paraffin wax, which can thicken and solidify in cold temperatures, causing the fuel to gel.
There are several products available to fix gelled diesel fuel, including Opti-Lube Gel Melt, Diesel 911, Diesel Rescue Emergency De-Gel, and FPPF Polor Power.
