
Diesel fuel is prone to gelling, which is when the waxes in the fuel crystallise in cold weather. This can happen when the temperature drops as low as 10-15°F, depending on the source and quality of the fuel. When diesel gels, it can clog the fuel tank and fuel lines, preventing fuel flow to the engine. This can cause damage to the fuel lines and stop the engine from running.
| Characteristics | Values |
|---|---|
| Temperature of fuel | Low temperatures cause the wax in diesel fuel to crystallise and gel |
| Wax crystallisation | Wax in diesel fuel crystallises at low temperatures, causing the fuel to gel |
| Fuel flow | Gelling prevents fuel flow to the engine |
| Fuel lines | Gelling clogs fuel lines |
| Fuel filters | Gelling clogs fuel filters |
| Engine | Gelling can cause engine damage |
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What You'll Learn
- Gelling occurs when the temperature of the fuel drops so low that wax naturally found in the fuel begins to crystallize
- Gelled diesel fuel can clog fuel lines and filters, causing havoc on your fuel system
- Gelling can occur as high as 20°F, depending on the source and quality of fuel
- Gelling can prevent fuel flow to the engine
- Gelling can cause damage to the fuel lines

Gelling occurs when the temperature of the fuel drops so low that wax naturally found in the fuel begins to crystallize
Gelling occurs in diesel fuel when the temperature of the fuel drops so low that wax naturally found in the fuel begins to crystallize. This can happen at temperatures as high as 20°F, depending on the source and quality of the fuel. Gelling can clog the fuel tank and fuel lines, causing damage to the fuel lines and preventing fuel flow to the engine. This can make it impossible for diesel engines to run.
The waxes in the fuel crystalize enough to where it becomes "cloudy" in appearance. As the temperature continues to drop, the waxes continue to crystalize further, compromising fuel flow and decreasing operational reliability. At 10-15°F, these waxes will cause the fuel to gel and clog the fuel supply and fuel filters.
If you are operating in a cold environment, there are measures you can take to avoid frozen diesel fuel. For example, parking your vehicle somewhere where temperatures don't get too cold, such as an insulated garage, can help prevent fuel from gelling. Once you've warmed up the engine, you can drive outside without worrying about diesel fuel gelling.
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Gelled diesel fuel can clog fuel lines and filters, causing havoc on your fuel system
Diesel fuel is prone to gelling, a term used to describe the crystallisation of waxes in diesel fuel in extremely cold weather. This gelling can prevent fuel flow to the engine or clog fuel lines and filters, making it impossible for diesel engines to run. You'll know if you have a possible gelling issue when your diesel vehicle will not start or stops operating during cold temperatures.
If you see any of these signs, or you know the external temperature will be below freezing, there are measures you can take to avoid frozen diesel fuel. The first action you can take to prevent fuel from gelling is to park your vehicle or equipment somewhere temperatures don't get too cold. For example, an insulated garage or equipment shed will be many degrees warmer than the temperature outside. Once you've warmed up the engine, drive outside and diesel fuel won't gel when the engine is running.
If you're dealing with gelled diesel fuel, you'll want to address the issue as soon as possible, especially since you likely won't be able to use your vehicle until you do.
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Gelling can occur as high as 20°F, depending on the source and quality of fuel
Gelling occurs in diesel fuel when the temperature of the fuel drops so low that wax naturally found in the fuel begins to crystallize. Gelling can occur as high as 20°F, depending on the source and quality of the fuel. For example, No. 2 diesel has a cloud point of 14°F, which is the temperature at which the waxes in the fuel crystallize enough to make the fuel appear cloudy. As the temperature continues to drop, the waxes crystallize further, compromising fuel flow and decreasing operational reliability. At 10-15°F, these waxes will cause the fuel to gel and clog the fuel supply and fuel filters.
The gelled diesel fuel can clog fuel lines and the filter, causing havoc on your fuel system and preventing your vehicle from starting or operating during cold temperatures. Diesel is comprised of straight and branched-chain hydrocarbons, also called paraffin waxes, which become solid around 17.5°F for No. 2 Diesel.
To prevent fuel from gelling, park your vehicle somewhere where temperatures don't get too cold, such as an insulated garage. Once you've warmed up the engine, drive outside, as diesel fuel won't gel when the engine is running.
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Gelling can prevent fuel flow to the engine
Gelled diesel fuel can stop your engine from starting or cause it to stop operating during cold temperatures. The waxes in the fuel crystallise enough to make the fuel appear cloudy. As the waxes continue to crystallise, fuel flow is compromised and operational reliability is decreased. At 10-15°F, the waxes will cause the fuel to gel and clog the fuel supply and fuel filters.
If you see signs of gelling, or you know the external temperature will be below freezing, there are measures you can take to avoid frozen diesel fuel. The first action you can take to prevent fuel from gelling is to park your vehicle somewhere where temperatures don't get too cold, such as an insulated garage. Once you've warmed up the engine, drive outside and diesel fuel won't gel when the engine is running.
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Gelling can cause damage to the fuel lines
Gelled diesel fuel can stop you in your tracks before you even get the engine started. It can clog fuel lines and the filter(s), causing havoc on your fuel system. You’ll know if you have a possible gelling issue when your diesel vehicle will not start or stops operating during cold temperatures.
Gelling can prevent fuel flow to the engine or clog fuel lines/filters, making it impossible for diesel engines to run. This can cause damage to the fuel lines and the engine. If the fuel tank’s temperature drops low enough, diesel will start to thicken and cause your vehicle to feel sluggish and accelerate slowly.
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Frequently asked questions
Gelling occurs in diesel fuel when the temperature of the fuel drops so low that wax naturally found in the fuel begins to crystallize.
Gelling can occur as high as 20°F, depending on the source and quality of fuel. No. 2 diesel has a cloud point of 14°F, and at 10-15°F, the waxes will cause the fuel to gel.
Your vehicle will feel sluggish in the cold, and you will experience slow acceleration. If your diesel vehicle will not start or stops operating during cold temperatures, you may have a gelling issue.
Park your vehicle somewhere where temperatures don't get too cold, such as an insulated garage. Once you've warmed up the engine, drive outside and diesel fuel won't gel when the engine is running.









































