Regan Brown
Diesel fuel is an essential component of our global economy, powering trucks, ships, and other heavy machinery. However, it is not without its drawbacks, particularly when it comes to cold weather. While diesel fuel does not technically freeze, it does experience issues in colder temperatures that can cause significant problems for diesel engines. This phenomenon, known as gelling or crystallization, occurs when the paraffin wax in diesel thickens and solidifies, impacting the engine's performance and potentially causing it to shut down. Understanding the challenges diesel fuel faces in cold climates and the solutions available is crucial for anyone relying on diesel-powered equipment, especially during winter.
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What You'll Learn
- Diesel doesn't freeze, but it does gel and coagulate at high temperatures
- Preventative measures include block heaters, mixing diesel types, and additives
- Water freezing in diesel engines can cause issues
- Changes to diesel composition have made winter issues more prevalent
- Anti-gel additives can be used to prevent gelling
Diesel doesn't freeze, but it does gel and coagulate at high temperatures
Diesel fuel doesn't freeze, but it does gel and coagulate at high temperatures. This process begins at around 34°F, when the fuel in the tank starts to get cloudy. This cloudiness is caused by the paraffin wax in diesel fuel beginning to thicken and crystallize. At this stage, the diesel is still usable, but it will hurt your mileage.
As temperatures continue to drop, the issue worsens. At 15°F, the diesel fuel will become like gel, and you will have trouble starting your engine. Anything below this temperature will cause significant problems for your diesel vehicle. The diesel fuel begins to enter a state of solidification that no longer allows it to move freely through the system. The fuel solidifies so completely that it can no longer flow at all, a stage known as the pour point.
The gelling process can be measured by a diesel fuel's Cold Filter Plugging Point, which is the lowest temperature at which the fuel will flow freely through the filter and remain operational. Typically, untreated diesel fuel will reach its Cold Filter Plugging Point 3 to 5 degrees F below its Cloud Point. However, fuel that has been treated with an antigel will not clog filters until the temperature reaches 20 to 25 degrees F below the Cloud Point.
To prevent diesel fuel from gelling, you can use an anti-gel fuel additive or supplement, which lowers the cloud/freezing point of diesel fuel. Engine manufacturers also recommend that newer diesel engines idle for no more than 3 minutes before driving, as idling can do more damage to the engine than starting and stopping. Additionally, many truckers will mix #1 and #2 diesel fuel, as #1 has kerosene in it, which significantly lowers the gel point of diesel fuel.
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Preventative measures include block heaters, mixing diesel types, and additives
While diesel fuel does not freeze, it does gel and coagulate at relatively high temperatures. This gelling can block up filters, lines, and fuel rails, causing the vehicle to accelerate or run poorly. Fortunately, there are several preventative measures that can be taken to avoid this issue.
One way to prevent diesel fuel from gelling is to use a block heater, which connects to your engine and warms the engine's coolant, keeping your oil warm and preventing it from freezing. However, this method does not protect the fuel in the tank or lines. Keeping your vehicle in a garage can also help, as it will be less exposed to the cold outdoor temperatures.
Another preventative measure is to mix different types of diesel fuel. Many truckers will mix #1 and #2 diesel fuel, as #1 contains kerosene, which has a lower gelling point than diesel fuel. Kerosene-blended fuel can be purchased or made at home, but it is important to use ultra-low-sulfur kerosene.
Additives are also available to prevent diesel fuel from gelling. These additives provide temperature coverage to help prevent the wax in diesel fuel from thickening and can also improve water dispersion, lubricity, and cetane. Winter-specific additives can be especially helpful, as they can prevent fuel line freeze-ups down to -40 °F. In an emergency, there are additives available that can reliquify gelled diesel and de-ice frozen fuel filters.
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Water freezing in diesel engines can cause issues
While diesel fuel does not freeze easily, it does contain paraffin wax, which thickens and crystallises in cold weather, leading to fuel gelling. This occurs at temperatures below 10°F (-12°C). Gelling causes the diesel to become non-combustible and blocks filters and fuel lines, preventing fuel flow and rendering the engine useless.
Water in the fuel can also cause issues in diesel engines. Water can enter the fuel through storage, handling, or condensation forming in the tanks. In winter, water in the fuel can freeze at 32°F, obstructing fuel lines and water separators. Ice crystals can block filters and pipes, causing abrasive wear to fuel systems and preventing fuel flow.
To prevent water-related issues in diesel engines, it is recommended to keep the fuel tank topped up with the correct grade of fuel. This helps to keep free water out of the fuel and avoid engine problems. Additionally, winterising fluids or additives can be used to treat the fuel and prevent water freezing and fuel gelling. These additives work by lowering the cloud point and the gelling point of the fuel, ensuring safe and efficient diesel engine operations at extremely low temperatures.
Other preventative measures include using block heaters, mixing #1 and #2 diesel fuel (as #1 has kerosene, which lowers the gel point), and garaging the vehicle to minimise exposure to cold temperatures. Regular maintenance and cleaning of filters can also help to mitigate the impact of water freezing and fuel gelling in diesel engines.
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Changes to diesel composition have made winter issues more prevalent
While winter has always been a challenging time for diesel engines, changes to the fuel's composition have exacerbated these issues in recent years. One significant alteration is the reduction of fuel sulfur content mandated by the EPA since the 1990s. This change has environmental benefits, as lower sulfur levels decrease the emission of harmful sulfur oxides. However, it also results in ultra-low sulfur diesel (ULSD) with reduced lubricity and cetane levels compared to traditional diesel fuel.
The decrease in sulfur content has indirectly contributed to water-related issues during winter. Historically, high sulfur levels helped keep water dispersed or burned off. However, with the introduction of ULSD, water is not dispersed effectively, leading to potential issues during the colder months. While actual diesel fuel gelling occurs only in extremely cold temperatures, water freezing can cause significant problems. Water freezing solidifies at much higher temperatures than paraffinic diesel, and when water freezes in the fuel system, it can lead to engine issues.
Another factor influencing winter issues is the addition of renewable hydrocarbon biofuels derived from sources such as corn and soy. These renewable fuels further contribute to water-related problems, as they increase the affinity of diesel for water. As a result, water issues become more prevalent during winter, when water is more likely to freeze and cause operational problems.
To address these challenges, various solutions have been proposed. One common approach is to use winter-specific diesel fuel additives, which can help mitigate issues related to fuel gelling and filter ice. Additives such as Power Service Diesel Fuel Supplement +Cetane act as anti-gels by lowering the cloud point and gelling point of the fuel. Additionally, block heaters can provide some protection during cold nights, although they may not be effective in safeguarding the fuel in the tank or lines. Mixing #1 and #2 diesel fuel is another strategy, as #1 diesel contains kerosene, which lowers the gel point. Overall, these measures aim to prevent fuel gelling, maintain fuel flow, and address water-related issues that have become more prevalent due to changes in diesel composition.
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Anti-gel additives can be used to prevent gelling
Diesel fuel does not freeze, but it does gel and coagulate at relatively high temperatures. This gelling typically starts at around 34 degrees Fahrenheit, when the fuel in the tank starts to get cloudy. By 10 to 15 degrees Fahrenheit, the diesel has gelled to the point that it can no longer flow through the system, blocking filters, lines, and fuel rails.
To prevent this, anti-gel additives can be used. These products work by lowering the cloud point of the fuel, increasing the lubricity of the wax molecules within the fuel and preventing them from sticking together. This, in turn, prevents the wax from clogging lines and filters in the fuel system.
There are several anti-gel additives on the market, including Howes Diesel Treat, Hot Shot's Secret Diesel Winter Anti-Gel, and Power Service Diesel Fuel Supplement +Cetane. These products are designed to be added directly to the fuel tank and are safe for use in all diesel engines, including semi-trucks, pick-up trucks, farm equipment, and standard-sized automotive vehicles.
In addition to preventing gelling, these additives can also improve cold starts, reduce fuel line freeze, boost cetane, and improve fuel economy. They can also act as a fuel conditioner, providing added lubricity to injectors, pumps, and upper cylinders, extending the life and increasing the performance of diesel engines.
Using an anti-gel additive is a crucial step in preventing diesel fuel from gelling and ensuring the proper functioning of diesel engines in cold weather.
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Frequently asked questions
Diesel fuel doesn't freeze, but it does gel and coagulate at relatively low temperatures. This process begins at around 34°F (-1.1°C) when the fuel in the tank starts to get cloudy, and at 10-15°F (-12°C) to (-9.5°C) the fuel solidifies and can no longer flow.
When diesel fuel freezes, it can block up filters, lines, and fuel rails. This can cause the engine to run poorly or even stop working altogether.
To prevent diesel fuel from freezing, you can use an anti-gel fuel supplement or winterizing fluids. These additives lower the freezing point of the fuel and help to keep it in a liquid state. Keeping your truck garaged and using block heaters can also help protect your diesel fuel from the cold.
