Rajan Wilcox
Rust and corrosion in a fuel tank can be caused by contaminated fuel, which can eat away at the insides of the tank, especially if the vehicle has been sitting for a long time. Petrol can leave heavy deposits of a varnish-like substance, which can trap moisture and lead to costly repairs. To repair a rusty fuel tank, one must first drain the tank, remove the fuel line and clean the inside of the tank. There are various methods for removing rust, including using white vinegar, electrolysis, or a commercial cleaner. Once the tank is clean and dry, it can be coated with a sealant or paint to prevent future rusting. In some cases, welding or soldering may be necessary to repair holes or leaks in the tank.
Repairing a Rusty Fuel Tank
| Characteristics | Values |
|---|---|
| Step 1 | Drain the tank and remove it from the motorcycle |
| Step 2 | Rinse the tank with water and capture remnant gas and particles in a trash can filter |
| Step 3 | Use white vinegar to remove rust flakes |
| Step 4 | Seal the tank with a product like Red-Kote, KBS Coatings, or POR Tank Sealer |
| Step 5 | Reinstall the tank back on the motorcycle |
| Alternative Methods | Welding, electrolysis, solder with a patch, fiberglass, zinc-dipped |
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What You'll Learn
Drain the fuel tank
To repair a rusty fuel tank, you must first drain the fuel tank. This is a crucial step as it ensures that no fuel remains in the tank, which could hinder the repair process and create a fire hazard. Here is a detailed guide on how to safely and effectively drain a fuel tank:
Before beginning, ensure you have the necessary safety equipment, including eye protection, gloves, and a respirator. Work in a well-ventilated area or outdoors to avoid inhaling fumes.
Locate the fuel tank and identify the fuel lines and connections. Place a suitable container, such as a small trash can or a designated fuel catch pan, underneath the drain plug or petcock valve. The container should be large enough to capture all the fuel and be securely positioned to avoid spills.
Turn off the fuel supply by closing the petcock valve or fuel line. This will prevent fuel from flowing out of the tank during the drainage process. If your vehicle has a fuel pump, ensure it is turned off as well.
If your vehicle has a fuel drain plug, simply open the plug to allow the fuel to drain into the container. You may need to use a wrench or a specialized tool to loosen the plug if it is tight. Remember to place a container under the plug to catch the fuel.
For vehicles without a fuel drain plug, you may need to remove the fuel lines or hoses connected to the tank. Use appropriate tools to disconnect the fuel lines, being careful not to damage them. Once the lines are removed, fuel will begin to drain from the tank. Ensure that the fuel flows into the container.
If there is only a small amount of fuel left in the tank, you may be able to siphon it out using a hand pump or a siphon hose. Place one end of the hose into the fuel tank and the other end into the container. Start siphoning by sucking on the hose to create a vacuum, then continue until the fuel is transferred. Be cautious when siphoning, as you should not ingest any fuel.
After draining the fuel, it is essential to properly dispose of it. Do not pour the fuel down drains or into the environment. Contact your local waste management facility or recycling center to inquire about proper fuel disposal methods and locations.
Once the fuel tank is drained, you can proceed with the next steps of repairing the rusted areas, such as cleaning, coating, or sealing the tank. Remember to refer to specific guides or seek professional advice for the subsequent repair stages.
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Remove rust with vinegar or electrolysis
To remove rust from the inside of a fuel tank, you can use either vinegar or electrolysis.
If you are using vinegar, you will need to fill the tank with vinegar and leave it to soak for several hours or overnight. The vinegar will loosen the rust, and agitators can be added to help dislodge particles. After soaking, drain the vinegar and rinse the tank. This process may need to be repeated. White vinegar is inexpensive, non-toxic, and widely available, and it is the least likely to damage the tank's underlying metal.
If you are using electrolysis, you will need a bike or car battery, clamps, a piece of steel or iron to use as a sacrificial anode, a plastic container large enough to fit the tank, and a sodium carbonate solution. The anode must not come into contact with the gas tank, so it should be held in place with a non-conductive material such as wood or plastic. The electrolysis process can take 24 hours or longer, and you may need to repeat it to remove all the rust. After the electrolysis, rinse the tank thoroughly with water.
Before attempting to remove rust, you should inspect the tank to determine the severity of the corrosion. If the tank is too damaged, de-rusting may not be enough, and replacement may be necessary.
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Seal the tank
Sealing a fuel tank is a crucial step in preventing rust and corrosion, which can cause costly repairs. Here are the detailed steps to effectively seal your fuel tank:
Prepare the Tank
Before sealing, ensure the tank is thoroughly cleaned and dried. Remove any remaining fuel, varnish, or debris. Assess the extent of rust and ensure the tank is structurally sound, with no pinholes or spots where the rust has made the tank wall too thin. If rust holes are present, cut small pieces of sheet metal and braze them over the larger holes. This step ensures a smooth and solid surface for sealing.
Choose a Suitable Sealant
Select a sealant designed specifically for fuel tank repair, such as Red-Kote, POR's three-part repair kit, or KBS Coatings' Gold Standard Tank Sealer kit. These products are formulated to adhere to the metal surfaces of the fuel tank and provide long-lasting protection.
Apply the Sealant
Follow the instructions provided with your chosen sealant. Typically, you will need to plug any holes or openings, such as the petcock and fuel sending unit, with rubber plugs, corks, or masking tape. Position the tank on a stand so that any excess sealant can funnel back into its container. Pour the sealant into the tank, ensuring enough quantity to coat the entire inner surface. Reinstall the gas cap and rotate the tank to achieve complete coverage.
Cure and Reinstall
Allow the sealant to cure completely before reinstalling the tank. The curing process may vary depending on the product used. For example, POR's sealer cures through air-drying, while others may require force-drying with a heat gun. Refer to the manufacturer's instructions for specific curing requirements. Once the sealant is fully cured, reinstall the tank back into your vehicle, following the appropriate safety procedures.
Maintenance and Prevention
To prevent future rust and corrosion, consider regular maintenance and inspections. Keep the fuel tank clean and free from debris and contaminants. If your vehicle is stored for extended periods, ensure the fuel tank is properly treated and protected to mitigate the risk of rust formation.
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Coat the tank
Coating a fuel tank is a necessary step in the restoration process. The inside of fuel tanks is made of bare metal, which can rust over time, especially if the vehicle has been sitting unused for long periods. This rust can cause costly damage to the carburetor, petcock, and fuel pump.
There are several products available for coating the inside of a fuel tank. One popular product is Red-Kote, which has been praised for its adherence and longevity. To use Red-Kote, the tank must be placed on a stand that allows the product to funnel back into its container. Any holes in the tank should be plugged, and then enough Red-Kote is poured in to coat the entire tank. The gas cap is then reinstalled, and the tank is rotated to ensure complete coverage. Excess product is then drained.
Other products that can be used include the KBS Coatings Gold Standard Tank Sealer kit, which is a three-step system that cleans, preps, and seals the tank. The first step is to wash the tank with a cleaner/degreaser solution, which is then rinsed with water and repeated until the water runs clear. Another option is POR's three-part repair kit, which includes a cleaner, metal prep, and sealer. The cleaner removes rust and fuel deposits, while the metal prep leaves a zinc phosphate coating and neutralises any remaining rust. The sealer is then poured in, and the tank is rotated to coat all internal surfaces. The excess sealer is then poured out, and the tank is force-dried with a heat gun.
It is important to note that coating a fuel tank requires a very clean surface, and it is recommended to let the tank sit for several days after sealing to allow the resin to cure completely before reinstalling and filling it with fuel.
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Reinstall the tank
Once you have completed the necessary repairs on your fuel tank, it is likely that the tank will have a few pinholes or minor leaks. To seal these, you can use a three-part repair kit that includes a cleaner, metal prep, and sealer. First, use the heavy-duty marine cleaner to remove any remaining rust and fuel deposits. Next, apply the metal prep, which will leave a zinc phosphate coating and neutralise any remaining rust.
After blocking every orifice, pour in the sealer and rotate the tank until all internal surfaces are coated. You can then remove any excess sealer and force-dry the tank with a heat gun. Note that moisture will reduce the effectiveness of the sealer, so leaving the tank in the sun to dry is not recommended.
After the tank has dried, you can reinstall it back into your vehicle. Replace any parts that were removed and secure the tank in place. This will prevent rust from returning for many years.
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Frequently asked questions
There are several ways to repair a rusted fuel tank. You can use a rust removal method, such as vinegar, electrolysis, or a dedicated rust remover, and then seal the tank. Alternatively, you can weld or solder patches over holes and then coat the tank.
You can use a dedicated tank sealer kit, such as the KBS Coatings Gold Standard Tank Sealer kit, or Red-Kote.
You can use white vinegar, electrolysis, or a dedicated rust removal product.
Fill the tank with vinegar and leave it to sit for several days. Then, drain the tank, shaking vigorously to remove rust flakes.
Electrolysis can be used to remove rust from small parts, but it may be difficult to achieve inside a fuel tank due to the size and the need for a large cathode.
