Ameer Randolph
Steel fuel tanks are commonly used to store bulk amounts of fuel due to their robustness and non-porous nature. However, they are prone to corrosion from weather conditions and contaminated fuel. To repair a corroded steel fuel tank, it is important to first identify the source of corrosion and address it to prevent further damage. Next, the tank should be emptied, cleaned, and treated with a suitable solution to remove any remaining contaminants and rust. This can be done using a rust removal product or a combination of sanding, wire wheeling, and washing with soap and water. Once the tank is clean and dry, a sealant or coating can be applied to prevent future corrosion and seal any leaks. It is important to follow the manufacturer's instructions for cure times and proper application methods. Finally, the fuel system should be reassembled, and the tank should be refuelled.
Repairing a Corroded Steel Fuel Tank
| Characteristics | Values |
|---|---|
| Prevention | Dewater tanks every six months to stop water build-up leading to corrosion |
| Regularly check and test fuel for contamination | |
| Avoid welding due to the risk of explosion | |
| Causes | Fuel being left dormant |
| Contaminated fuel | |
| Weather conditions such as heat, condensation, and UV light | |
| Water build-up | |
| Bacterial microbial contamination | |
| Repair Methods | Use a sealant to fix leaks |
| Use a wax and grease remover to clean the tank | |
| Use an etch primer to improve paint bonding and reduce rusting | |
| Surface sanding and wire wheeling | |
| Fill the tank with argon | |
| Use a heat gun to soften wax coatings | |
| Use a dent gun to remove dents | |
| Use a carbon-tipped heat-shrinker to remove high spots | |
| Use a tank sealer |
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What You'll Learn
Sand the corroded area
To repair a corroded steel fuel tank, you must first sand the corroded area. This is a crucial step in preparing the tank for cleaning and further repair.
Before you begin, ensure the tank is completely empty and free of any fuel, varnish, or debris. This can be done by draining and rinsing the tank with soap and water, or using a fuel or oil-specific cleaner and degreaser. It is imperative that you allow the tank to air out for several days to ensure no flammable fumes remain, as these can be explosive.
Once the tank is empty and safe, you can begin sanding. You will need to use sandpaper, and the grit of the sandpaper you choose will depend on the extent of the corrosion and the finish you desire. For example, 220-grit sandpaper will smooth out the surface without aiming for a perfect restoration. Start by sanding the areas with rust to smoothen the surface between the metal and any existing paint. Be careful not to sand too much and create unwanted high spots. If you do end up with high spots, these can be reduced with gentle tapping with a hammer or a carbon-tipped heat-shrinker.
After sanding, it is important to remove any dust or contaminants from the surface. You can use a wax and grease remover for this step to ensure the surface is clean.
Now that the corroded area has been sanded and prepared, you can move on to the next steps of repairing your steel fuel tank, such as applying a primer and sealant.
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Use a sealant
Using a sealant is an effective way to repair a corroded steel fuel tank. Before applying the sealant, the tank must be thoroughly cleaned and dried. This involves removing any built-up grime, varnish, or loose rust using a mechanical abrasive, such as a piece of chain or nuts and bolts, and a cleaning solution like KBS Klean. It is crucial to ensure the tank is free from plastic parts, contamination, and old sealers. Additionally, the tank should be free from loose rust, which can be achieved by sanding the affected areas with grit sandpaper.
Once the tank is clean and dry, it is time to prepare the metal surface to receive the sealant. This can be done using an acid metal etch, such as RustBlast, which neutralizes existing rust, etches the metal, and leaves a zinc phosphate coating, enhancing the adhesion of the sealant. It is important to follow the manufacturer's instructions for application, as different sealants may have specific requirements. After applying the acid metal etch, the tank should be thoroughly rinsed with water.
The next step is to apply the sealant. It is recommended to follow the manufacturer's instructions for the specific sealant being used. Generally, the sealant is poured into the tank, and the tank is slowly rotated to ensure that the entire interior surface is evenly coated. It is crucial to ensure that all areas, including remaining surface rust, leaky weld seams, and pinholes, are adequately sealed. The tank should be rotated for an extended period, typically around thirty minutes, to achieve a thorough coating.
After applying the sealant, it is essential to drain the excess from the tank. Puddles of sealant should be avoided, as they can foam and bubble, impacting the adhesion to the metal. The tank should then be allowed to air dry in a well-ventilated area. The curing time can vary depending on the sealant used, with some requiring up to 96 hours for maximum cure.
It is important to note that some sealants may require additional steps, such as the application of a primer or a metal prep solution, to ensure proper adhesion and enhance the corrosion resistance of the sealant. It is always recommended to refer to the manufacturer's instructions and take the necessary precautions when working with sealants and cleaning solutions.
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Remove water from the tank
To repair a corroded steel fuel tank, you must first drain the tank of any fuel and water. This can be done by siphoning or using a pump to remove the liquids. If you are not planning to save the fuel, you don't need to separate the water from the fuel.
If you are dealing with a large fuel tank that cannot be easily removed, such as in a boat or vehicle, you have a few options:
- Use a pump to remove the liquids: You will need a pump with sufficient pumping height to lift the liquids out of the tank and into another container. Be careful to choose a pump that is not submersible, as it will not fit inside the tank. Facet pumps, for example, can lift fuel from a height lower than 12 inches.
- Pull the fuel line: Disconnect the fuel line from the pump and extend it out through the drain to drain the liquids. You can also pull the tank sender and use a hose to drain the liquids.
- Use an electric fuel pump: This option requires careful handling due to the potential risks involved.
Once the tank is empty, you can begin the process of repairing the corrosion. It is important to clean the tank thoroughly before applying any treatments or sealants. Sand the areas with rust using grit sandpaper to smoothen the surface. Remove any dust or contaminants with a wax and grease remover. You can also wash out the tank with soap and water or fill it with argon to clean up the rusty areas.
After the tank is clean and dry, you can apply a sealant to the leaking areas. Work the sealant with a mixing stick, ensuring it bonds strongly with the metal. Let the sealant cure for the recommended amount of time, which can vary depending on the product used. Once cured, you can sand the sealant to smoothen the finish.
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Use a rust-busting kit
To repair a corroded steel fuel tank, you can use a rust-busting kit. This is a good option if you want to avoid welding, which can be dangerous.
First, you need to drain the fuel tank and disconnect the fuel lines. It is important to work in a well-ventilated area, away from any flammable substances. Next, use a pressure washer to remove loose rust from the tank. You can also use hot soapy water to clean the tank. If there is a lot of rust, you may need to use a chemical rust removal agent, such as muriatic or hydrochloric acid. However, these chemicals release harmful fumes, so wear protective clothing, eyewear, gloves, and a facemask. Keep a fire extinguisher nearby as well.
Once the rust has been removed, you can use a rust-busting kit to treat the metal and prevent future corrosion. KBS Coatings offers a range of kits that include everything you need to clean, prep, and seal your tank. Their Tank Sealer System will remove rust and restore the inside of your tank to like-new condition. It forms a tough, fuel-impervious coating while sealing small pinholes and weld seams. The Cycle Tank Sealer Kit is designed for motorcycles, generators, lawn mowers, and other small tanks up to 5 gallons. The Large Cycle Tank Sealer Kit is for larger tanks up to 12 gallons. The Auto Fuel Tank Sealer Kit can seal tanks up to 25 gallons. These kits come with detailed instructions to ensure professional and long-lasting results.
After using a rust-busting kit, you may want to paint your fuel tank. This will require additional surface preparation, such as steam cleaning and a hot and soapy scrub. You can also have the tank zinc-dipped to achieve an original look. Finally, remember to let the tank sit for several days to allow any resin sealer to cure before reinstalling and filling it with fuel.
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Avoid welding
Repairing a corroded steel fuel tank without welding is possible, but it is important to exercise caution as fuel fumes can be explosive. Before beginning any repair work, it is crucial to ensure that the tank is empty and has been aired out for an extended period.
One method to repair a corroded steel fuel tank without welding is to use an epoxy or soldering. This method has been used to patch aluminium fuel tanks, and it can be reinforced with fibreglass tape for added strength. However, it is important to note that welders caution against using fillers if you plan to weld the tank in the future.
Another approach is to use a fuel tank repair kit, which includes a cleaner degreaser, metal prep, and a fuel storage additive. The cleaner degreaser is mixed with hot water and poured into the fuel tank to remove rust flakes, fuel gum, varnish, and debris. After shaking and rinsing the tank, products like Frost's Rust Buster can be used to treat any remaining rust. An etch primer can then be applied to improve paint bonding and reduce the risk of further rusting.
Additionally, it is important to identify and address the cause of the corrosion. Condensation and the corrosive qualities of fuel can contribute to internal fuel tank corrosion, especially in vehicles that have been stationary for extended periods. The use of a fuel storage additive and stabiliser can help prevent the formation of gum and varnish and maintain fuel octane levels.
While welding is a common method for repairing steel fuel tanks, it carries risks, including the danger of explosion due to fuel fumes and the possibility of burning a hole in the thin, corroded metal. Therefore, it is recommended to explore alternative repair methods or seek specialised professionals for welding fuel tanks to ensure safety.
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Frequently asked questions
Lack of fuel is the first warning sign. A more serious sign is a never-drying patch of weeping fuel on the outside of the tank.
First, drain the tank and remove any fuel residue. Next, sand the areas with rust and smoothen out the surface. Then, clean the tank with a wax and grease remover. Finally, apply a primer and paint to reduce the risk of further rusting.
You can use a fuel tank repair kit, such as Frost's 4-stage Fuel Tank Repair Kit or KBS Coatings' Gold Standard Tank Sealer Kit. These kits typically include a cleaner, degreaser, and sealer.
To prevent corrosion, regularly check and test the condition of your fuel. Tanks should be dewatered every six months to stop water build-up, which can lead to corrosion.
Do not attempt to weld the tank yourself as it is dangerous and can cause the tank to explode. Instead, seek a specialist for welding services.
