
Cleaning a poly fuel tank can be a challenging task, but with the right tools and methods, it can be done effectively. The process involves removing the fuel tank, draining old fuel, and using various cleaning solutions and techniques to eliminate dirt, sediment, and other contaminants. Some common approaches include steam cleaning, pressure washing, and utilising degreasers or fuel to clean the tank. It is important to ensure the tank is thoroughly dried before use, and to be cautious when working with chemicals and equipment to avoid damage to the tank and ensure safety.
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What You'll Learn

Use a hose to clean the tank
Using a hose is an effective way to clean a poly fuel tank. The first step is to remove the tank and drain it of any fuel. If there is a significant amount of residue or build-up inside the tank, it may be necessary to first pour in some fuel and swish it around to loosen the debris. After draining the fuel, the next step is to rinse the tank with water. This can be done by using a garden hose or a pressure washer with a nozzle. Spray water into the tank until all the debris is removed. If desired, distilled water can be used for a final rinse to remove any mineral residue.
After hosing down the tank, it is important to ensure that all the water is drained out. One way to do this is to use compressed air to spray out the remaining water. Alternatively, you can leave the tank in a well-ventilated area and let it air-dry. If you choose to air-dry the tank, it is recommended to leave it in direct sunlight for a couple of weeks to ensure complete evaporation of the water.
To speed up the drying process, you can use clean towels to wipe the inside of the tank. Some people also suggest using a vacuum cleaner to remove any remaining moisture. Once the tank is completely dry, it is important to let it sit for a while to ensure that there is no residual moisture. Even after a thorough cleaning, it is common to still have a lingering gas smell.
While using a hose to clean the tank, it is important to be cautious and avoid getting water into the carburetor or other sensitive components, as this could lead to additional problems. Additionally, some people suggest using soap or a specific cleaner like HEET or Industrial Purple in conjunction with hosing to more effectively remove stubborn residue.
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Steam cleaning
Firstly, it is important to remove the fuel from the tank. This can be done by pumping out the fuel through a fuel filter into containers. Once the fuel is removed, the tank should be moved to a location where you can easily access the inside of the tank, such as removing the inspection hatch.
Next, prepare the steam cleaner. While a commercial steam cleaner is ideal, a wallpaper steamer can also be used. Ensure that you have enough steam hose to reach all areas of the tank.
Before beginning the steam cleaning process, it is recommended to fill the tank with a mixture of water and a cleaning agent such as Pine Sol. Let this mixture sit for a few days, as this will help to dissolve and loosen any built-up residue inside the tank. After a few days, rinse the tank with clean water to remove the cleaning mixture.
Now, you can start the steam cleaning process. Direct the steam into all areas of the tank, including corners and sides, to ensure a thorough cleaning. The steam will help to loosen and remove any remaining residue or contaminants. It may be helpful to turn the tank to get better access to all areas.
After steam cleaning, rinse the tank with clean, fresh water to remove any remaining residue or cleaning solution. Ensure that all water is drained from the tank, and use a portable vacuum with a hose to remove as much moisture as possible.
Finally, allow the tank to air dry completely. Place it in a safe location and let it sit until you are sure it is entirely dry. Even with a thorough cleaning, it is common to still have a residual fuel smell.
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Chemical cleaning
To chemically clean a poly fuel tank, the first step is to drain the tank completely. This ensures that the tank is free of any residual chemicals that could react with the cleaning agents. Next, you should pour a mixture of cleaning agents and water into the tank. One option is to use a 50/50 mixture of Pine-Sol and water, letting it sit for a few days to dissolve any gunk inside the tank. Other suggested mixtures include gasoline with loose hardware, nuts, and lock washers, or denatured alcohol, though you should test this on a small spot first to ensure it doesn't affect the plastic.
After letting the cleaning mixture do its work, the next step is to rinse the tank thoroughly. This can be done with water from a garden hose or, for a more intensive clean, a pressure washer or trip to a self-serve car wash. It is important to rinse multiple times to ensure that all the cleaning agents are removed, as microscopic chemical residues can cling to the tank walls, potentially causing issues down the line.
Once the tank is rinsed, you may need to scrub off any remaining residue with a non-abrasive cleaner and a scrub brush or sponge. Avoid harsh chemicals or abrasive materials, especially if your tank is made of specialized plastic polymers, as these can damage the plastic. After scrubbing, the tank should be rinsed again to remove any leftover cleaner and debris. If needed, the scrubbing and rinsing process can be repeated until the tank is thoroughly clean.
Finally, to ensure your poly fuel tank is free of bacteria or germs, it is important to disinfect it after cleaning. This can be done with a disinfectant spray or wipe, ensuring that all surfaces of the tank are covered.
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Removing residue
First, it is important to drain the tank of any remaining fuel or liquid. This can be done by siphoning or pouring out the contents. If there is a significant amount of residue or build-up, you may need to scrape or wipe away the bulk of it before proceeding.
Next, you can use a cleaning solution to help break down and remove any remaining residue. There are a few options for cleaning solutions that are safe for poly tanks. One option is to use a mixture of fresh gasoline and kerosene. Slosh this mixture around inside the tank, allowing it to dissolve and loosen any remaining residue. You can then pour this mixture through a paint strainer or filter to catch any larger particles. Alternatively, you can use a commercial degreaser or carburetor cleaner, such as Pine Sol or Purple Power, diluted with water. Always ensure the cleaner is safe for plastic and poly tanks and follow the manufacturer's instructions for dilution and application.
For stubborn residue, you may need to employ a more physical approach. One method is to use a bag of nuts and bolts as an abrasive. Place the nuts and bolts inside the tank, seal it, and then shake vigorously. The nuts and bolts will act as a scouring agent, scraping away at the residue. You can also add a paint thinner to this method to help break down the residue further. Just be sure to rinse the tank thoroughly with water afterward to remove any chemical residue.
Finally, it is important to rinse and dry the tank thoroughly. Rinse the tank with clean water, ensuring that all traces of the cleaning solution are removed. You can use a garden hose or a pressure washer for this step, ensuring that all internal surfaces are rinsed. For hard-to-reach areas, you can use compressed air to blow out any remaining water. Allow the tank to air dry completely before reassembling or refilling it.
It is important to note that some residue may be particularly challenging to remove and may require multiple cleaning attempts. Always exercise caution when working with chemicals and ensure the work area is well-ventilated.
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Drying the tank
Firstly, after removing the fuel and cleaning the tank with water, it is important to drain as much water as possible. Use a garden hose to rinse out the tank and ensure all the cleaning solution has been removed. It is important to drain as much water as possible, as gasoline will not flush out water, and you want to avoid any water remaining in the tank.
Next, if you have access to a portable vacuum, attach a hose to the exhaust and place it inside the tank. This will help to remove any remaining water and speed up the drying process. Run the vacuum for a good amount of time to ensure the tank is as dry as possible.
After using the vacuum, it is recommended to let the tank sit and air dry. Leaving it in a safe place for a while will ensure that any remaining moisture evaporates. You can leave the tank in the sun to speed up the drying process and ensure it is completely dry.
Additionally, you can use compressed air to speed up the drying process and remove any remaining water droplets. Spray the compressed air inside the tank, paying particular attention to any areas that may retain moisture.
Finally, it is important to note that even after a thorough cleaning and drying process, you may still notice a gas smell. This is normal, and you can be confident that the tank is clean and dry as long as you have followed the above steps carefully.
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Frequently asked questions
First, drain the tank of any fuel. Next, you can either:
- Rinse the tank with soapy water, then pour out and check for any residue. If there is still residue, repeat the process.
- Use a steam cleaner to clean the tank.
- Alternatively, use a small amount of fresh fuel and slosh it around in the tank.
You can use a mild degreaser, such as Purple Power, or a grease remover that is safe for poly tanks, like Gunk engine cleaner. If you want to use a chemical treatment, contact your local radiator shop.
You can dry your tank by leaving it in the sun for two weeks, or using a portable vacuum to dry it out.










































