Regan Brown
Diesel fuel is a complex mixture of thousands of potential compounds, each with unique chemical and physical characteristics. While diesel does not truly freeze, it does gel and coagulate at relatively high temperatures. This process, known as diesel gelling, can cause significant issues for diesel engines and vehicles, particularly in cold climates. As temperatures drop, the paraffin wax in diesel thickens and crystallizes, leading to the gelling that obstructs filters, lines, and fuel rails. Understanding the factors influencing diesel gelling and implementing preventative measures, such as additives or switching fuel types, are crucial for ensuring the smooth operation of diesel-powered equipment during winter.
Why does diesel fuel freeze?
| Characteristics | Values |
|---|---|
| Freezing point | -40 to -200 degrees Fahrenheit |
| Gelling point | 32-34 degrees Fahrenheit |
| Gelling | Formation of wax crystals that thicken and crystallize |
| Gelling causes | Water in the fuel, renewable fuels, low sulfur content, cold weather |
| Prevention | Use of additives, switching to No. 1 diesel fuel, garaging vehicles, block heaters |
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What You'll Learn
Diesel doesn't freeze, it gels
This issue is more prevalent in recent years due to changes in the fuel composition. Since the 1990s, the EPA has mandated a reduction of fuel sulfur content, which has resulted in ultra-low sulfur diesel (ULSD) having decreased lubricity and lower cetane. Additionally, the addition of renewable hydrocarbon bio-fuels, such as corn and soy, has created issues as ULSD with renewable fuel has a higher affinity for water, leading to potential water issues in the winter.
To prevent diesel gelling, there are several options. One suggestion is to switch from No. 2 fuel diesel, which contains paraffin wax, to No. 1 fuel diesel, which does not contain paraffin wax and therefore does not gel at any temperature. Another option is to add an additive to the fuel, which can be done before fueling up. These additives improve cold flow and prevent gelling. Block heaters can also be used, although they do not protect the fuel in the tank or lines. Keeping the vehicle in a climate-controlled garage can also help prevent diesel gelling.
It's important to note that water in the fuel system can also cause issues in the winter. Water freezes at higher temperatures than diesel and can solidify, leading to potential engine problems. Keeping free water out of the fuel is crucial to avoiding these issues.
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Gelling occurs at around 32-34°F
Diesel fuel does not freeze like water does. Instead, it gels and coagulates at relatively high temperatures. Gelling typically occurs when the temperature drops below 32°F, but it happens most often when the temperature hits 15°F. At around 32-34°F, the fuel in the tank starts to get cloudy, indicating that wax crystals have begun to stick together. This is known as the cloud point of diesel fuel. As the temperature continues to drop, the gelling process can block up filters, lines, and fuel rails, preventing the fuel from flowing freely through the system.
The gelling process is caused by the presence of paraffin wax in the diesel fuel. During warm temperatures above 32°F, the paraffin wax remains liquid and flows smoothly through the fuel filters. However, when the temperature drops, the paraffin wax thickens and crystallizes, leading to the gelling of the diesel fuel. This can cause significant issues for vehicles and equipment, as the fuel cannot be pumped through the fuel tanks, potentially resulting in shutdowns.
To prevent diesel gelling, there are several options available. One common method is to use additives that lower the gel point of the diesel fuel. These additives are often added by diesel companies to their own fuel tanks and equipment, and they can also be purchased separately and added before fuelling up. Additionally, switching to No. 1 fuel diesel, which does not contain paraffin wax, can eliminate the gelling issue altogether as it does not gel at any temperature.
Another approach is to mix No. 1 and No. 2 diesel fuel, as No. 1 contains kerosene, which has a lower wax content and significantly lowers the gel point. Storing vehicles in a climate-controlled garage can also help maintain the temperature and prevent gelling. For trucks that are exposed to cold temperatures, using block heaters can provide some protection, although it may not be sufficient for the fuel in the tank or lines.
It is important to note that while gelling is a significant issue, most diesel issues during winter are caused by water and sulfur content rather than actual gelling. Water can freeze and solidify at higher temperatures, creating issues within the fuel system. Additionally, the reduction of fuel sulfur content mandated by the EPA has led to decreased lubricity and lower cetane in diesel fuel, contributing to winter operability problems.
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$30.99
Gelling blocks filters, lines, and fuel rails
Diesel fuel does not freeze like water does. Instead, it gels and coagulates at relatively high temperatures. This gelling process can block up filters, lines, and fuel rails, preventing diesel from moving freely through the system. At around 32-34 degrees Fahrenheit, diesel in the tank starts to get cloudy, indicating the beginning of the gelling process. As temperatures drop further to around 15 degrees Fahrenheit, the diesel begins to solidify, leading to blockages. This can cause the vehicle to run poorly or even shut down completely.
To prevent diesel gelling, there are several measures that can be taken. One option is to use a fuel additive, which can be added to the tank before fuelling up. These additives help prevent the formation of wax crystals and keep the diesel in a liquid state. Another suggestion is to switch from No. 2 fuel diesel to No. 1 fuel diesel. No. 2 diesel contains paraffin wax, which is the main component that causes gelling, while No. 1 diesel does not contain this wax and therefore does not gel at any temperature.
Additionally, block heaters can be used to keep the vehicle warm, although they may not protect the fuel in the tank or lines. Mixing No. 1 and No. 2 diesel fuels is another strategy, as No. 1 contains kerosene, which lowers the gel point of diesel fuel. Keeping the vehicle stored in a climate-controlled garage can also help maintain the temperature and reduce the risk of gelling.
In cases where gelling has occurred, the filter can be cleaned, and the truck can be warmed up to clear the gelled fuel. As the diesel warms, the wax crystals dissolve, and the fuel returns to its liquid state. However, if the fuel does not clear when warmed, it may indicate the presence of additional chemistry or reactions that have created soft solids that do not melt at normal operating temperatures.
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Paraffin wax in diesel causes gelling
Diesel fuel does not freeze, but it does gel and coagulate at relatively high temperatures. This gelling usually occurs when the temperature drops below 32 degrees Fahrenheit, but it can happen at 10 or 15 degrees Fahrenheit. Gelling can block up filters, lines, and fuel rails, and the fuel is no longer able to move freely through the system.
The gelling process is caused by paraffin wax, which is a naturally occurring substance in No. 2 fuel diesel. During warm temperatures, paraffin wax stays liquid and flows freely through the fuel filters in vehicles. However, when temperatures drop, the wax begins to crystallize and can build up and block fuel filters and lines. This build-up is known as "gelling" and can lead to diesel engine fuel starvation, causing the engine to not start or become hard to start.
The Cloud Point is the point at which diesel fuel becomes cloudy from waxes lumping together. As the temperature continues to drop, the wax and wax crystals in the diesel fuel form a gel-like consistency. This gel can clog fuel filters and cause problems for the engine. The point at which the filter plugs and operations cease is called the CFPP (Cold Filter Plug Point).
To prevent diesel gelling, diesel companies add an additive to their fuel tanks and equipment. This additive can also be purchased separately and added to the tank before filling up with diesel fuel. Switching to No. 1 fuel diesel is another option, as it does not contain paraffin wax and therefore does not gel at any temperature.
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Additives can prevent diesel gelling
Diesel fuel does not freeze, but it does gel and coagulate at relatively high temperatures. This "gelling" is caused by the paraffin wax in the fuel crystallizing and forming solid particles, which can block up filters, lines, and fuel rails. This can cause engine complications, such as reduced fuel pressure and delayed response times.
To prevent diesel gelling, there are a number of additives that can be added to the fuel. These additives can lower the pour and gel points of the wax, improving the engine's performance at lower temperatures. Additives can also improve the fuel's water dispersion, lubricity, and cetane. It is important to choose a high-quality additive that is suitable for the temperature range you will be operating in.
There are a variety of additives available on the market, such as Hot Shot's Secret's EDT+ Winter Defense and Diesel Winter Anti-Gel, which are designed to reduce fuel line freeze-ups and prevent fuel filters and lines from clogging. Diesel Winter Rescue is another product that can help solve gelling and icing issues by thawing frozen filters and reliquifying gelled diesel.
It is recommended to keep several bottles of anti-gel additives, such as Diesel 911, in your vehicle during the winter months. These additives can help reliquify gelled fuel and restore the engine's fuel flow. It is also important to follow the directions on the bottle when using these additives.
In addition to additives, there are other ways to prevent diesel gelling, such as using block heaters, mixing #1 and #2 diesel fuel, and storing your vehicle in a climate-controlled garage. However, additives provide a low-cost and hassle-free solution to prevent fuel gelling and improve engine performance.
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Frequently asked questions
Diesel fuel doesn't technically freeze, but it does gel and coagulate at relatively high temperatures. This is due to the paraffin wax in the fuel, which begins to thicken and crystallize, causing the fuel to take on a cloudy appearance and eventually blocking up filters, lines, and fuel rails.
Diesel fuel typically begins to gel when temperatures drop below 32 degrees Fahrenheit, with gelling often occurring at around 10 to 15 degrees Fahrenheit.
Diesel gelling can cause issues with diesel engines and equipment, including reduced performance, sudden stops, and even complete shutdowns. This is because the gelled fuel cannot flow freely through the system and clogs fuel filters, lines, and rails.
There are several ways to prevent diesel gelling:
- Use a block heater and plug it in on cold nights.
- Mix #1 and #2 diesel fuel, as #1 diesel contains kerosene, which lowers the gel point.
- Add additives that improve cold flow and prevent gelling.
- Store your vehicle in a climate-controlled garage to reduce exposure to cold temperatures.
