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Tips to Ungel Diesel Fuel

Semi Truck Being Refuelled with Diesel Close up with the Gloved Hand of the Truck Driver Holding the Fuel Nozzle and holding it in Place as He Fills up the Tank.

Gelling of diesel fuel happens in winter temperatures and concerns all drivers who reside in extremely cold climates. Having the correct equipment on board is the key when you need to know how to ungel diesel fuel in an urgent situation. Winter seasons can be longer and harsher at times. As a result, most winter fuel mixes offered at filling stations cannot handle the lower temperatures required for a diesel engine to run without problems. Adding a good diesel fuel additive or anti-gel to your tank can considerably reduce the likelihood of gelled diesel fuel.

What Is Diesel Gelling?

Diesel gelling occurs when diesel fuel turns from a liquid to a gel-like form due to freezing conditions. The diesel fuel hardens to a gel-like consistency. Diesel can no longer be circulated or filtered via the engine when this scenario occurs.

What Temperatures Does Diesel Fuel Gel?

When the temperature drops below 32°F, it's good to start applying anti-gel as soon as the temperature drops. As a general rule, the lesser the temperature, the more gasoline additives are required. We recommend that you follow the anti-gel's directions on the container.

How to Ungel Diesel Fuel

There are some creative suggestions on how to ungel diesel fuel on your own for individuals who are into DIY. The primary goal is to warm up a gasoline tank. Some people recommend putting a propane torpedo heater beneath the tank and hay bales surrounding the truck to keep the heat in.  Another option is to acquire a barrel and chop out 4 to 5 inches of the bottom before topping it with sand and diesel/kerosene. The next process is igniting it and utilizing it as a heat source. The flame is nearly non-existent, and it should not be able to pass through the barrel's side. While these suggestions may be helpful and successful for some people, specialists do not endorse them due to the danger involved. If you decide to try them, proceed with caution.

Ungelling Diesel with Fuel Additives

The use of an additive is the most popular method of ungelling diesel. They are not only affordable and recommended, but they are also simple to operate on your own.

Let's imagine you have gelled gasoline and gelled fuel lines, injector rails, and fuel filters. You also don't have an extra filter to use in their place. You can solve this problem by using a good gasoline additive.

How to Ungel Diesel Fuel with Fuel Additives:

  1. Fill the gasoline tank with a sufficient amount of fuel additive. An acceptable ratio is an ounce for every 10 gallons of fuel left in the gelled tank. If all you want to do is keep your gasoline from gelling, this amount is generally unnecessary. However, if your gasoline has already gelled, this is a more serious situation.

  2. Disconnect the iced diesel fuel filter and immediately apply the fuel additive to the filter media. Do the same thing with the filter housing. As the chemical thaws these components, you'll hear the filter lines shatter.

  3. As directed by the manufacturer, change the chamber and casing, and prime the diesel fuel system. Wait 30 minutes for the additive to make its way around the injector rails before starting the engine. The use of fuel additives is a simple solution to the problem of gelled diesel fuel. But, remember that preventing your fuel from gelling in the first place is far more vital and valuable.


Preventing diesel gelling is the best protection. You can keep your car going down the road for temps as low as -40°F by adding an anti-gel additive with every fill-up during the cold-weather season. Anti-gel additives further boost cetane and lubricity, resulting in improved performance. If your diesel engine gels, it's recommended to apply an emergency additive to re-liquify the gasoline and get it operating again. Preparing your diesel engine for winter will keep your truck running effectively throughout the wintertime. By taking care to do this, you can prevent engine snarl-ups on your next journey.

Contact us today to learn more about our becoming a truck driver with Veltri.


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