
Cleaning out a gummed-up plastic fuel tank can be a challenging task, especially if it has been sitting for a while. The first step is to drain the tank and remove it from the vehicle. Next, it is important to choose an appropriate cleaning solution, such as acetone, denatured alcohol, kerosene, or gasoline. Some people recommend using hot water and soap or a degreaser like Purple Power. The tank should then be filled with the chosen solution and allowed to sit for several hours or even overnight. The solution can then be dumped out, and the tank should be rinsed and shaken to remove any remaining residue. This process may need to be repeated several times to ensure the tank is thoroughly cleaned.
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What You'll Learn

Using denatured alcohol and acetone
If your plastic fuel tank is gummed up, you can use denatured alcohol and acetone to clean it out. Denatured alcohol is generally safe to use on plastics and is a good option if the fuel is still liquid and can flow a little. If the fuel is more solid and gooey, acetone is a better option.
To clean the tank with denatured alcohol, fill the tank halfway with the alcohol, shake for 20-30 seconds, then dump out the liquid. Repeat this process a few times to ensure the tank is clean.
Acetone is a more aggressive solvent and may attack the swirl pot, so it should be used with caution. If using acetone, fill the tank halfway to three-quarters full, shake for 20-30 seconds, then dump out the liquid. Repeat this process, then fill the tank halfway with denatured alcohol and repeat the shake and dump process.
It is important to note that you should not use water in your fuel tank, as it can cause issues with the glow fuel. Always use a solvent when cleaning a fuel tank.
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Applying soap and water
One method for cleaning out a gummed-up plastic fuel tank is to use soap and water. This is a simple and effective way to remove any built-up residue without causing any damage.
First, remove the fuel tank from your vehicle. Drain any remaining fuel from the tank and dispose of it safely. It is important to ensure that the tank is completely empty before proceeding. Next, fill the tank with hot water and add a small amount of mild soap or dish detergent. Dawn dish soap is often recommended for this purpose.
Let the soapy water sit in the tank for a while. The exact duration may depend on the severity of the gumming, but generally, it is advisable to let it soak for several minutes or longer. You may also want to agitate the soapy water inside the tank by shaking it gently or using a tool to dislodge any stubborn residue.
After soaking, rinse the tank thoroughly with clean water to remove the soap and any loosened debris. Repeat the filling, soaking, and rinsing process as necessary until the tank is completely clean. Finally, dry the tank thoroughly before refilling it with fuel and reinstalling it in your vehicle. You can use compressed air to blow out any remaining water droplets, and/or let the tank air-dry for a day.
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Soaking with fresh mix
So, you've got a gummed-up plastic fuel tank and are looking to soak it with a fresh mix to clean it out. Here's a detailed, step-by-step guide to help you get it done effectively:
First things first, remove the fuel tank from your vehicle. This will give you a safe and accessible space to work with. Next, you'll want to drain the tank of any remaining fuel. It's important to get rid of as much of the old, gummed-up fuel as possible. Once drained, you can start the cleaning process.
Now, for the "soaking with a fresh mix" part. For this step, you have a few options depending on the state of your fuel tank and your personal preferences:
- If your tank is made of a material that can handle it, you can use lacquer thinner as your soaking solution. Lacquer thinner is an effective solvent and will help dissolve the gunk in your tank. However, be cautious as it can be too strong for some plastics.
- Another option is to use a mixture of acetone or denatured alcohol with some fresh fuel. Fill the tank halfway with this solution, shake it for 20-30 seconds, then dump it out. Repeat this process once more to ensure the tank is clean. Acetone is especially useful if you're dealing with really gooey, dried-out oil.
- A third option is to use a combination of soap and water. This method is more affordable and accessible, and it works well. Use a product like Dawn dish soap, and fill the tank with hot water and soap. Let it soak, then rinse and repeat if necessary. Finally, rinse the tank with nitro fuel to remove any remaining water.
No matter which method you choose, it's important to be cautious and use common sense. Some substances, like water, can be harmful to certain tanks, so always double-check that your chosen cleaning solution is safe for your tank's material. Additionally, it's crucial to ensure your tank is thoroughly dried before refilling it with fuel and reinstalling it in your vehicle.
By following these steps and being mindful of your tank's specific needs, you'll be able to effectively clean out your gummed-up plastic fuel tank using the "soaking with a fresh mix" method.
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Using a vacuum cleaner
To clean out a gummed-up plastic fuel tank using a vacuum cleaner, follow these steps:
Firstly, drain the tank and remove it from the vehicle. This is important as it ensures that you are working with the tank in isolation and can focus on cleaning it thoroughly.
Next, you'll want to rinse the tank with water. Stand the tank upright and hose it down from top to bottom. This will help rinse any debris down to the bottom of the tank. You can also try using soapy water for this step, which may help break down and remove any stubborn residue.
After rinsing, use a vacuum cleaner to remove the water and any remaining debris from the tank. It is recommended to use an air-powered vacuum cleaner to reduce the risk of static, which could be an issue when working with fuel. If using an air-powered vacuum is not an option, ensure you take the necessary fuel-related precautions to avoid any potential hazards.
Reach into the tank with a rag to wipe down the interior and remove any remaining residue. You can also use long needle-nose pliers to help reach into tighter spaces. This step ensures that you get into all the nooks and crannies of the tank, providing a more thorough clean.
Finally, allow the tank to dry completely before reinstalling it. Place it somewhere safe and well-ventilated to ensure all fuel smells dissipate, and leave it for a sufficient amount of time to ensure it is entirely dry.
By following these steps, you can effectively clean out a gummed-up plastic fuel tank using a vacuum cleaner, leaving it fresh and ready for use.
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Cleaning with kerosene or straight gasoline
Kerosene or straight gasoline are both effective solvents for cleaning a gummed-up plastic fuel tank. This method is ideal for removing stinky, stale-smelling fuel that has turned into varnish.
First, remove the fuel tank from your vehicle. Plug the outlet, then fill the tank with kerosene or straight gasoline. Only fill the tank about halfway to leave some room for sloshing. Replace the cap and let the tank sit overnight.
The next day, remove the cap and dump out about half of the liquid. Swish the remaining liquid around in the tank a few times, then dump it out. You may need to repeat this process a few times to fully clean the tank.
After cleaning, rinse the tank with nitro fuel to wash away any leftover solvent. It is important to ensure that no water enters the fuel tank during this process.
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Frequently asked questions
There are several methods to clean out a gummed-up plastic fuel tank. Some common approaches include using:
- Denatured alcohol or acetone.
- Kerosene or straight gasoline.
- Lacquer thinner (with caution).
- Fresh fuel mix.
- Non-ethanol gasoline.
- Degreasers like WD-40 or Purple Power.
- Soap and water.
To use denatured alcohol or acetone, follow these steps:
- Fill the tank halfway to three-quarters full with acetone or denatured alcohol.
- Shake for 20-30 seconds, then dump out the liquid.
- Repeat the process, filling the tank halfway with denatured alcohol and shaking and dumping again.
- Shake out as much liquid as possible, then reinstall the tank and run the engine as normal.
To use soap and water, follow these general steps:
- Remove the tank and drain any remaining fuel.
- Rinse the tank with water to remove debris.
- Use soap and water to clean the tank, allowing it to soak if necessary.
- Rinse the tank with water again to remove any soap residue.
- Dry the tank thoroughly before refilling it with fuel.
Yes, here are some important precautions and considerations:
- Avoid using water if possible, as it can be harmful to the fuel system.
- Be cautious when using solvents like lacquer thinner on plastic tanks.
- Ensure the tank is completely purged of fumes before using any electrical cleaning equipment to avoid static-related hazards.
- If using nuts, bolts, or other small objects to dislodge debris, ensure they are counted and removed after cleaning.











































