Sylvie Willis
Aluminium fuel tanks are used in the automotive and shipbuilding industries due to their light weight, durability, and corrosion resistance. However, they still require regular cleaning and maintenance to sustain these properties. Cleaning an aluminium fuel tank can be challenging, especially when dealing with built-in tanks or those with small openings. While some opt for professional cleaning services, others explore DIY methods using various household products and chemicals. The chosen cleaning approach depends on the type and extent of the contamination, which may include old fuel, varnish, sludge, corrosion, or dissolved rubber. Common cleaning agents include fresh gasoline, kerosene, paint thinner, acid wash, fuel tank cleaner, and even unconventional combinations like ice cubes, salt, and toilet bowl cleaner. Safety precautions, such as wearing protective gear and ensuring proper ventilation, are crucial when handling chemicals and cleaning agents.
Characteristics and Values Table for Cleaning an Aluminum Fuel Tank
| Characteristics | Values |
|---|---|
| Removal | Aluminum fuel tanks should be removed from the vehicle or boat before cleaning. |
| Initial Wash | Wash with water to remove excess fuel. |
| Rust Removal | Use a metal chain and continue rinsing with water to remove rust. |
| Acid Wash | Fill the tank with water and add a cup of muriatic acid. Dispose of the contents and repeat until the wash is clear. |
| Fuel Tank Cleaner | Follow the instructions on the bottle. Leave overnight, then empty and wash with water. |
| Drying | Allow the tank to dry for at least 24 hours before reinstalling. |
| Alternative Methods | Kerosene, paint thinner, E85 gasoline, acetone, hot water and soap, ice cubes, salt, and toilet bowl cleaner are also suggested. |
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What You'll Learn
Removing the tank from the vehicle or boat
Before removing the fuel tank from your vehicle or boat, you will need to drain it. If you are dealing with a boat, you can siphon the fuel out by placing an empty gas tank next to the boat, removing the engine connector fitting from the hose, and putting the hose into the empty tank. Then, pump the primer bulb to start the siphon. Alternatively, you can use a manual or electric pump to drain the fuel. If you are removing a fuel tank from a vehicle, you will need to disconnect the hoses and electrical connectors. There will likely be multiple hoses, including supply lines, return lines, and vent hoses. Once the fuel lines are disconnected, you can disconnect the electrical connector(s). Be sure to follow safety precautions and check the access panel. Now you are ready to remove the metal straps holding the tank to the vehicle by loosening the nuts or bolts. Be prepared for the tank to drop down and support it so that it doesn't fall when the last strap is removed.
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Using a metal chain to remove rust
To clean an aluminium fuel tank, it is important to remove any fungus, grime, or varnish first. While there are chemical cleaners available, such as Eagle 1 A to Z Wheel Cleaner, a simple method is to use fresh gasoline. Gasoline acts as a solvent and will clean the inside of the tank. Simply pour it in and shake the tank vigorously.
Now, to remove rust from the inside of an aluminium fuel tank using a metal chain, here is a step-by-step guide:
Step 1: Prepare the Chain
Take a section of metal chain that is long enough to reach the inside surfaces of the fuel tank. Ensure the chain is made of a rust-resistant metal or a metal that is less likely to rust than the tank, such as stainless steel. This will help prevent adding more rust to the tank.
Step 2: Clean the Chain
Before using the chain, ensure it is free from any dirt, grease, or debris. You can clean the chain with a degreaser and then rinse it with water.
Step 3: Add Kerosene to the Chain
Pour kerosene onto the chain, ensuring it is well coated. Kerosene is a solvent that will help loosen and dissolve any rust inside the fuel tank.
Step 4: Insert the Chain into the Tank
With the chain well-coated in kerosene, carefully insert it into the fuel tank. You may need to feed it through the tank's filler opening or any other accessible openings. Ensure you are wearing protective gear, such as gloves and eye protection, during this process.
Step 5: Agitate the Chain
Once the chain is inside the tank, begin to move it around vigorously. Shake, rotate, and agitate the chain so that it scrapes against the inner surfaces of the tank. The chain's links will help break down and dislodge any rust buildup. Continue this process for several minutes, ensuring that you reach all areas of the tank, including the bottom and corners, where rust may accumulate.
Step 6: Remove the Chain and Rinse the Tank
After agitation, carefully remove the chain from the tank. Rinse the tank with clean water to remove any loosened rust particles and kerosene residue. You may need to use a hose or pressure washer to thoroughly rinse the tank, ensuring no kerosene or rust residue remains.
Step 7: Inspect and Repeat if Necessary
After rinsing, inspect the inside of the tank for any remaining rust. If there is still significant rust buildup, you may need to repeat the process or consider using a different rust removal method in conjunction with the chain method.
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Cleaning with an acid wash or fuel tank cleaner
If you are not concerned about the finish of your aluminium fuel tank, you can use an acid wash or a dedicated fuel tank cleaner to remove grime and polish the tank.
Acid Wash
Acid wash treatments include aluminium brightener, naval jelly, and muriatic acid. Aluminium brightener is a strong acid that foams up and can be rinsed off. It will remove any grime without scrubbing but will also remove polish and turn the aluminium white. Muriatic acid is another option, but it is a very strong acid that can cause rust on unpainted metal surfaces and turn aluminium black. It is recommended to dilute muriatic acid with water at a ratio of 7:1 and to use it outdoors with good ventilation. After using an acid wash, it is important to properly dispose of the contents and rinse the tank with water.
Fuel Tank Cleaner
Dedicated fuel tank cleaners include Eagle 1 A to Z Wheel Cleaner, Gumout, Pyroil, Holley, and CRC. These products can be sprayed into the tank, followed by a small amount of water, and then sloshed around to loosen caked-on sludge. It is important to follow the instructions on the bottle or container when using a fuel tank cleaner. After cleaning, the tank should be emptied and rinsed with water to remove any remaining chemicals and particles.
When using any cleaning agents, it is important to wear protective gear to avoid inhaling or touching the chemicals. It is also recommended to leave the tank overnight with a weak acid solution or weak fuel tank cleaner inside, and to let the tank dry completely for at least 24 hours before reusing it.
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Leaving the tank overnight with a weak acid solution
If you are looking to clean the inside of an aluminium fuel tank, you may want to consider using an acid wash or a fuel tank cleaner. Aluminium brightener, for instance, can be used to remove grime without scrubbing, although it will also remove any polish.
If you decide to use an acid wash, you must first fill the fuel tank with water before adding a cup of muriatic acid. Dispose of the contents of the tank properly, and repeat the process until the wash becomes clear.
Alternatively, you can use a fuel tank cleaner. These products typically come with their own set of instructions, which should be followed carefully.
After washing with your preferred cleaner, you may want to leave the tank overnight with a weak acid solution or weak fuel tank cleaner inside. The next day, it is important to empty the tank and wash it with water to ensure that all remaining chemicals and particles are removed. Before installing the tank back into your vehicle or boat, let it dry completely for at least 24 hours.
Additionally, by allowing the tank to sit overnight, you can ensure that all areas of the tank are exposed to the cleaning solution. This is especially beneficial if you are cleaning a tank with hard-to-reach areas or internal baffles, as it gives the acid time to work its way into all the nooks and crannies.
It is important to note that when working with any type of acid, you must prioritise safety. Always wear protective gear, including gloves and eye protection, to avoid any accidental contact or inhalation of the acid. Additionally, ensure that the work area is well-ventilated to prevent the buildup of fumes.
By following these steps and allowing the tank to soak overnight in a weak acid solution, you can effectively clean your aluminium fuel tank and restore it to its optimal condition.
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Drying the tank for at least 24 hours
After cleaning your aluminum fuel tank, it is important to dry it thoroughly before using it again. This process can vary depending on the cleaning method used and the size and shape of the tank. One common method for drying a fuel tank is to use forced air. This can be done with a shop vac, as mentioned by a user on SportFishing BC, or with a hair dryer, as suggested by a user on Grassroots Motorsports. It is important to ensure that the tank is completely dry before use, as any remaining moisture can mix with fuel and cause issues.
Another method for drying a fuel tank is to let it air dry in a well-ventilated area. This process can take at least 24 hours, depending on the climate and the size of the tank. To speed up the drying process, one can use a fan or leave the tank in direct sunlight. It is important to keep the tank open and uncovered during this process to allow for proper ventilation and to prevent the buildup of fumes.
For complex tank shapes with hard-to-reach areas, some people recommend using a volatile solvent like xylene or toluene, which will evaporate and condense on the tank's surfaces, dissolving any remaining moisture or residue. This method should be done in a well-ventilated area and with proper safety precautions, as these solvents can be harmful if inhaled.
After drying the tank, it is important to inspect it for any signs of damage or corrosion, especially if the tank has been removed and cleaned externally. Any damage to the tank's surfaces or coatings should be addressed before refilling the tank and putting it back into use.
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Frequently asked questions
It is possible to clean an aluminium fuel tank without removing it from a boat or vehicle. One method is to use a chemical cleaner such as Gumout, Pyroil, Holley, CRC, Eagle 1 A to Z Wheel Cleaner, or a carb cleaning kit. Another method is to use ice cubes, salt, and toilet bowl cleaner, rinsing well when done.
Chemical cleaners that can be used to clean aluminium fuel tanks include Gumout, Pyroil, Holley, CRC, Eagle 1 A to Z Wheel Cleaner, carb cleaning kits, kerosene, paint thinner, E85 gasoline, fresh gasoline, acetone, xylene, and muriatic acid.
The best way to clean the inside of an aluminium fuel tank depends on the level of cleaning required and the finish desired. If the tank is heavily soiled, it may be necessary to remove it and use a metal chain to loosen rust and grime before rinsing with water. If the finish is not a concern, an acid wash or aluminium brightener can be used, which will turn the metal white.
To clean an aluminium fuel tank with fungus, it is recommended to use a chemical cleaner such as Gumout, Pyroil, Holley, or CRC, which can dissolve varnish and gummy residues. It may be necessary to soak the tank in the cleaner for a few days and repeat the process several times to remove all the fungus.
To prevent fungus from growing in an aluminium fuel tank, it is important to clean and maintain the tank regularly. This includes removing excess fuel, rinsing with water, and using a fuel tank cleaner or acid wash to remove any built-up grime or rust. The tank should also be dried completely before use to avoid generating issues.
