Sylvie Willis
Diesel fuel contains a small percentage of paraffin wax, which helps diesel engines generate more power and efficiency. While this wax exists as a liquid under mild to high temperatures, it crystallizes and thickens the fuel under lower temperature conditions. This wax build-up can clog fuel filters and fuel lines, leading to fuel starvation and engine problems. This issue is particularly prevalent during cold weather, when temperatures drop below the cloud point, causing the fuel to turn cloudy and eventually gel-like. Understanding wax formation and taking preventive measures are crucial for maintaining the performance and longevity of diesel engines.
| Characteristics | Values |
|---|---|
| Percentage of wax in diesel fuel | Small percentage of diesel fuel is paraffin wax |
| Wax in diesel fuel under mild to high temperatures | Helps an engine to generate more power and efficiency from the fuel |
| Wax in diesel fuel under lower temperature conditions | Crystallizes and thickens the fuel |
| Wax in diesel fuel under very low temperatures | Flow of fuel slows down and could plug the fuel lines and filter |
| Wax build-up in diesel engines | Wax build-up in the fuel filter |
| Wax build-up in diesel engines during cold weather | Wax crystallizes and blocks the engine's fuel filters and fuel line |
| Cloud point | Point at which fuel begins forming crystals, typically around 40 degrees Fahrenheit |
| Pour point | Point at which wax crystals turn liquid fuel into a gel-like substance, typically around 32 degrees Fahrenheit |
| Cold filter plugging point | Diesel fuel in a gel-like state can still flow through the engine until it reaches this point |
| Wax formation in marine diesel fuels | Blocked oil filters and a complete loss of power |
| Preventing wax formation in marine diesel fuels | Use of distillate fuel treatments and cold flow additives |
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What You'll Learn
Why does wax form in diesel fuel?
Wax formation in diesel fuel, also known as diesel waxing, is a common issue that occurs during cold weather. Diesel fuel contains a small percentage of paraffin wax, which exists as a liquid under mild to high temperatures. This wax component is added to diesel fuel to improve fuel viscosity, lubrication, and engine responsiveness. It also increases power and efficiency.
However, when the temperature drops, the wax in diesel fuel begins to crystallize and thicken the fuel. This process is known as gelling, and it can cause significant problems for fuel filters and fuel lines. The wax crystals can build up and block these components, leading to fuel starvation and engine performance issues, such as hard starts and loss of power.
The cloud point is the initial stage of wax formation, where the fuel starts to appear cloudy as the wax particles join together to form larger clumps. This typically occurs at temperatures around 40 degrees Fahrenheit. As the temperature continues to drop, the wax build-up progresses to the pour point, at which the fuel takes on a gel-like consistency and begins to clog fuel lines and filters. The final stage is the cold filter plugging point (CFPP), where the fuel is no longer able to flow through the filter, resulting in complete fuel starvation for the engine.
To prevent wax formation and its associated issues, various measures can be taken. Some manufacturers offer overnight heaters or coolant heaters to warm the fuel during cold weather. Additionally, additives can be used to improve the cold flow properties of the fuel and delay wax crystallization. These additives act as a buffer, helping to postpone the formation of wax crystals and extending the CFPP.
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How does wax impact diesel engines?
A small percentage of diesel fuel is paraffin wax. At mild to high temperatures, this wax helps an engine to generate more power and efficiency from the fuel. However, in cold weather, the wax crystallizes, and if the temperature drops too low, these crystals can build up and block the engine's fuel filters and fuel lines. This "gelling" can lead to diesel engine fuel starvation, causing the engine not to start or to become hard to start. This process occurs in three stages, with each stage corresponding to a decrease in temperature: the cloud point, the pour point, and the cold filter plugging point.
The cloud point is the point at which the wax in diesel fuel begins to form crystals. This typically happens when temperatures reach about 40° Fahrenheit (4.4° Celsius). At this stage, the wax begins to coat the fuel filters. As the temperature continues to drop, the fuel reaches its pour point, at which the wax and wax crystals form a gel-like substance. Once the pour point is reached, the fuel can no longer flow freely and begins to clog the fuel lines and filters. Finally, the cold filter plugging point is reached when the gel-like fuel can no longer flow through the filter, completely starving the engine of fuel.
Some early signs of wax build-up include hard starts, a noticeable loss of power, and dips in overall fuel economy. To prevent wax build-up, it is recommended to add a diesel flow improver additive to the fuel, which lowers the cold flow point of the fuel and prevents wax crystallization. Storing vehicles in a heated garage or using overnight cold-weather heaters can also help prevent wax build-up.
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How to prevent wax build-up
Modern diesel contains a small percentage of paraffin wax due to its high cetane value. While this wax helps an engine to generate more power and efficiency from the fuel under mild to high temperatures, it crystallizes and thickens the fuel under lower temperature conditions. This can cause the fuel lines and filter to become clogged, leading to hard starts, a noticeable loss of power, and dips in overall fuel economy.
Store your vehicle in a heated space
Storing your truck in a heated garage or climate-controlled building can help prevent wax build-up.
Use diesel flow improver additives
Adding a diesel flow improver additive to your fuel can lower the cold flow point of diesel fuel and prevent wax crystallization. These additives change the shape and structure of the crystals that form, preventing them from combining and overwhelming your fuel filter.
Use kerosene
Mixing kerosene with diesel fuel can reduce the plug point temperature and keep wax crystals from forming. Winter climate fuel suppliers sometimes offer diesel fuel pre-mixed with kerosene. However, it is important to note that this technique may not be suitable for all vehicles due to the high tolerance of common rail injection systems.
Use anti-gelling additives
Adding an anti-gelling additive to your fuel during the winter months can help prevent wax crystallization and improve fuel economy.
Use overnight heaters
Numerous manufacturers supply plug-in, overnight cold weather heaters that warm your fuel while your vehicle is parked. Most models use the same power outlet as engine block heaters.
Use coolant heaters
Coolant heaters utilize heat from the coolant to warm the fuel. The heat from the refrigerant is routed through the coolant manifold to heat the coolant, which then transfers the heat to the engine's fuel.
Regular fleet maintenance
Preventative maintenance by expert diesel engine technicians can help ensure that your vehicle runs efficiently regardless of the weather.
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The impact of temperature on wax formation
A small percentage of diesel fuel is composed of paraffin wax. This wax has a positive impact on engine performance at mild to high temperatures, helping the engine to generate more power and efficiency from the fuel. However, the impact of temperature on wax formation in diesel fuel becomes a problem at lower temperatures.
At lower temperatures, the paraffin wax in diesel fuel begins to solidify and form crystals. This process is known as the cloud point, which typically occurs when temperatures reach about 40°F (-4°C to 15°C). At this stage, the fuel will start to look cloudy, and the wax will begin to coat the fuel filters. As the temperature continues to drop, the wax crystals can build up and block the engine's fuel filters and fuel lines. This is known as the pour point, which usually occurs around 32°F (-9°C to -18°C). At this point, the fuel takes on a gel-like consistency and can no longer flow freely, leading to issues such as hard starts, loss of power, and fuel economy.
Overall, the impact of temperature on wax formation in diesel fuel is a critical consideration for diesel engine owners, especially during the winter months. By understanding the temperature thresholds and taking preventive measures, they can avoid the performance issues and engine damage caused by wax crystallization.
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The impact of wax on fuel filters
All modern diesel contains a small percentage of paraffin wax because of its high cetane value. While this wax helps an engine to generate more power and efficiency from the fuel under mild to high temperatures, it crystallizes and thickens the fuel under lower temperature conditions. This wax build-up, or "gelling", can block fuel filters and fuel lines, leading to fuel starvation and causing engines to not start or become hard to start.
The cloud point is the point at which the wax in diesel fuel begins to form crystals, typically when temperatures reach about 40 degrees Fahrenheit. At this point, the wax starts to coat the fuel filters and the fuel will start to visibly become cloudy. The fuel must stay very cold (below -10°F (-23°C)) for long periods (48-72 hours) before it will gel.
The next stage is the pour point, when the wax and wax crystals have formed enough to turn the once liquid fuel into a gel-like substance. The pour point generally begins around the 32-degree Fahrenheit mark. This gel can clog fuel filters and cause hard starts, loss of power, and fuel economy issues.
Finally, the cold filter plugging point (CFPP) is the point at which fuel is no longer able to flow through the filter due to the build-up of wax crystals. When fuel reaches its CFPP, there is very little that can be done to dissolve the wax crystals back into the fuel. To prevent wax build-up, anti-gelling additives can be added to the fuel, and heaters can be used to warm the fuel during cold weather.
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Frequently asked questions
Yes, all modern diesel contains a small percentage of wax due to its high cetane value.
When temperatures drop, the wax in diesel fuel crystallizes and thickens the fuel. This can slow down the flow of fuel and eventually plug the fuel lines and filter, causing fuel starvation and engine failure.
To prevent wax build-up, you can add anti-gelling or cold flow additives to your fuel, such as kerosene or DieselPower CFPP. You can also use heaters to keep your fuel and engine warm during cold weather.
