Katerina Swanson
A dirty fuel tank can lead to fuel pump failure, so it is important to keep it clean. This is especially true if your car has been sitting in the garage for over six months or if you recently replaced the fuel pump. Before cleaning your fuel tank, it is important to take safety precautions such as working outdoors in a clean, open area, or ensuring decent ventilation if working indoors. You should also prepare your tools beforehand, including a container for your old fuel and a cleaner for your gas tank. To clean your fuel tank, you can try various methods such as using a pressure washer, gravel, or chemicals like vinegar and baking soda.
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What You'll Learn
Prepare your tools and safety gear
Before you begin the process of cleaning your fuel tank, it is imperative to prioritise safety and have all the necessary tools at hand. Here is a comprehensive guide to help you prepare:
Work Environment
It is advisable to work outdoors in an open space when cleaning your fuel tank. If circumstances require you to work indoors, ensure adequate ventilation by opening doors and windows, and consider setting up fans to enhance airflow.
Safety Gear
The nature of the task warrants the use of personal protective equipment (PPE). It is recommended to wear a face mask to prevent inhalation of toxic fumes and protect your eyes with safety glasses or goggles. Additionally, keep a fire extinguisher nearby as a safety precaution.
Tools and Equipment
To effectively clean your fuel tank, you will need an assortment of tools and equipment:
- Toolbox: Gather a toolbox that contains the essentials, such as screwdrivers, wrenches, and any other tools specific to your fuel tank's disassembly and reassembly.
- Container for Old Fuel: Have a suitable container ready to safely dispose of the drained fuel from your tank.
- Fuel Tank Cleaner: Choose an appropriate cleaner designed for fuel tanks. This could be a mild detergent or a specialised fuel tank cleaning solution.
- Brushes: You may need brushes of various sizes to scrub and loosen debris from the fuel tank, especially if the opening allows for it.
- Hose: A hose will be necessary to rinse the fuel tank with clean, hot water.
- Pan or Bucket: Have a pan or bucket ready to collect and contain any dirty, contaminated water that you dump out of the fuel tank.
- Lint-free Washcloth: To further wipe and clean the interior of the fuel tank after rinsing.
- Compressed Air: Utilise compressed air to thoroughly dry the fuel tank after cleaning.
- Fuel Line Antifreeze/Water Remover: Add this to the fuel tank to absorb any residual moisture.
- Absorbent Towel: In case you need to dry out any standing water that may remain in the tank.
- Flashlight: A flashlight will assist in inspecting the tank for damage, debris, or cracks.
By following this guide, you will be well-prepared with the necessary tools and safety gear to commence the cleaning of your standing fuel tank.
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Drain the fuel tank
Before you begin to drain your fuel tank, it is important to take the necessary safety precautions. Work outdoors in a clean, open area, and if you have to work indoors, ensure there is good ventilation. Open all doors and windows and set up fans to improve airflow. Keep a fire extinguisher nearby and ensure there are no open flames. It is also recommended to wear a face mask and glasses to protect yourself from toxic fumes.
To drain the fuel tank, you will need to first remove the fuel pump, being careful not to let any residual debris fall into the tank. Next, disconnect the line from the carburetor and the vent line, if your vehicle has one. Place a bucket or fuel can underneath the tank and release the clamp to allow the fuel to drain. Dispose of the fuel in a safe manner.
Once the tank is empty, use a flashlight to check for debris, holes, or cracks. Use a baster to remove any loose debris. If you notice any damage, the tank may need to be replaced. If the tank is severely corroded or damaged, it is recommended to replace it rather than attempt to repair it, as this can pose a risk of leakage, fire, or fuel contamination.
If your tank is in good condition and does not require replacement, you can proceed with the next steps. One method is to fill the tank with gravel or nuts and bolts, then drive around with it strapped to a tractor tire to tumble the contents and loosen debris. Alternatively, you can use a pressure washer to remove loose debris and follow up with a cleaning agent such as vinegar, evaporust, or paint thinner.
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Remove debris and deposits
To remove debris and deposits from a fuel tank, start by draining all the fuel from the tank using the drain cock. Place the fuel in an approved container or fuel caddy. Next, check for debris and damage inside the tank. Shine a flashlight inside the tank and look for beads of light that indicate holes or cracks. Use a baster to remove loose debris.
If there is extensive debris or damage, you may need to cut the tank open and clean it using a pressure washer, which can reach around the inside of the tank. Alternatively, you can fill the tank with gravel, nuts, or lead shot and tumble it around by ratchet-strapping it to a tractor tire and driving around for a while. You can also try using a chemical cleaner like vinegar, evaporust, or paint thinner, or an acid like phosphoric acid, which leaves a protective coating inside the tank.
If there is rust in the tank, you can try to remove it with a pressure washer, or with an acid like phosphoric acid or muriatic acid, which will remove rust but also iron, so it must be done outdoors with good ventilation. After using any method, rinse the tank with clean, hot water and dry it thoroughly with compressed air or by leaving it in the sun.
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Clean the tank with water and detergent
Cleaning a fuel tank with water and detergent is a straightforward process, but it requires careful preparation. Before you begin, ensure you have a fire extinguisher nearby and remove any potential ignition sources. Tidy your workspace and ensure proper ventilation. Wear a face mask and goggles to protect yourself from fumes and splashes.
First, drain the tank of any fuel. If there is a valve or a cock, use it to drain the tank. Otherwise, you may need to use a hose or a pump to siphon the fuel into an approved container. If there is still liquid in the tank, turn it upside down and allow it to drain.
Next, mix dish detergent with hot water. Some sources suggest using a hose to spray the detergent into the tank, while others recommend pouring in the detergent-water mixture. Let the mixture sit in the tank for up to 24 hours. If your tank still smells of gasoline, you may need to use a degreaser like Marine Clean.
After the detergent mixture has been sitting for long enough, swirl the tank to dislodge any remaining fuel, sediment, and debris. Dump the contents of the tank into a pan, being sure to collect all the liquid as it is toxic and should not be allowed to run into the environment.
Rinse the tank with hot water twice more, focusing on coating the sides to ensure all the detergent is rinsed out. Use a lint-free cloth to wipe down the outside and apertures of the tank. Shake out the tank and remove any moisture from areas you can reach with the cloth.
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Dry the tank
Drying the fuel tank is a crucial step in the cleaning process. It is important to ensure that the tank is completely dry before inspecting it for any damage or rust. Here are some detailed instructions for drying a fuel tank:
Firstly, after rinsing the tank with water and detergent, use compressed air to blow out any remaining water. You can use an air hose or a leaf blower to force air into the tank and ensure all water is removed. If using a shop vacuum to remove water, be cautious and avoid creating a vacuum, as this can lead to static electricity and cause an explosion.
Secondly, if the tank is placed in a warm environment, the heat will help evaporate any remaining moisture. You can place the tank upside down in direct sunlight, allowing the sun's heat to speed up the drying process. Additionally, you can use a space heater or a hairdryer to direct warm air into the tank, ensuring the filler opening is pointing upwards to let the moisture escape.
Another method to dry the tank is to use acetone, a volatile petrochemical that can effectively absorb water. However, be cautious as acetone is flammable, and it is crucial to avoid creating sparks or open flames during the drying process.
Finally, to ensure that the tank is completely dry, you can use fuel line antifreeze or a product like HEET, which is specifically designed for water removal in gas tanks. These products will absorb any residual moisture and prevent future issues caused by water in the fuel system.
It is important to note that drying a fuel tank requires caution, and if you are unsure about any steps, it is always best to seek professional advice or refer to the manufacturer's instructions.
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Frequently asked questions
If you spot debris in the fuel tank or leaking gasoline, it's time for a clean. If your car has been sitting in the garage for over six months or if you recently replaced the fuel pump, you’ll have to clean your gas tank.
It is important to work outdoors in a clean, open area. If you have to work indoors, ensure decent ventilation by opening all doors and windows, and set up fans to improve airflow. Keep a fire extinguisher within reach and ensure there are no open flames nearby. Prepare your tools beforehand, including your toolbox, a container for the fuel, and a cleaner for your gas tank. Wear a face mask and glasses to protect yourself from toxic fumes.
First, drain the fuel tank using an approved container or a fuel caddy. Then, drop the tank and clean the area where the pump is being removed from with a brush. Next, insert a hose into the fuel tank and begin pouring a stream of clean, hot water. While the water is filling, spray a mild detergent into the tank. If possible, use a brush to loosen debris from the sides of the tank. Stop the stream of water and swish the water around to ensure all debris has been captured. Dump the dirty contaminated water into a pan. Wipe the tank with a lint-free washcloth and dry the tank completely with compressed air.
You can use cleaning vinegar, evaporust, or baking soda to clean the exterior of the tank. To clean the inside of the tank, some people have suggested using muriatic acid, but this will rust almost immediately and is not recommended. Phosphoric acid will also work and will leave a protective coating inside the tank afterward.
