Rajan Wilcox
Rust in a fuel tank can cause engine cut-outs and reduce a bike's performance, so it's important to know how to repair it. The first step is to inspect the tank to determine the severity of the corrosion. If the rust has caused structural issues, the tank may need to be replaced. If not, there are several methods to remove the rust, including using white vinegar, a caustic soda solution, or a commercial rust cleaner. After removing the rust, the tank should be sealed to prevent future rusting. Some sources recommend using a fuel-resistant paint or epoxy sealer, while others suggest welding the tank. Proper maintenance and storage can also help to prevent rust issues in the future.
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What You'll Learn
Inspect the tank for damage and corrosion
Inspecting the tank for damage and corrosion is a crucial step before deciding on the appropriate course of action. Here is a detailed guide to help you through the inspection process:
Firstly, it is important to remove the fuel tank from the motorcycle or vehicle. This will provide you with access to all areas of the tank and make the inspection process more manageable. Make sure to drain the fuel using the manufacturer's recommended method. It is crucial to be cautious and follow safety procedures during this step.
Once the tank is removed and emptied, you can begin the visual inspection. Shine a flashlight into the tank and carefully examine the interior surfaces for rust. Pay close attention to the thickness and flakiness of any rust present, as this indicates the severity of corrosion. The thicker and flakier the rust, the more challenging it will be to remove.
Additionally, check for physical damage to the tank, such as deep dents, large cracks, or signs of severe impact. Assess whether the rust has led to or worsened any structural issues. If the damage is extensive, it may be more prudent to consider replacing the tank altogether.
Don't forget to inspect the fuel itself for any signs of rust or debris. Drain a small sample of fuel into a clear container and examine it. If you notice rust particles or debris, it is a clear indication that the interior of the tank is severely corroded, and you may need to consider replacement.
Finally, after completing the inspection, make an informed decision by considering the condition of the tank, the rarity of the vehicle, and the potential effectiveness of de-rusting treatments. Sometimes, the damage may be too extensive for de-rusting to be a viable option, and tank replacement may be the best course of action.
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Drain the fuel and remove the tank
Before you drain the fuel, it is important to inspect the tank to determine the severity of the corrosion. Open the gas tank cap and shine a flashlight inside to check the interior surfaces for rust. The thicker and flakier the rust, the deeper and more difficult it will be to remove. You can also drain a small amount of fuel into a clear container and look for rust particles or debris. If the tank is too damaged, de-rusting may not be enough, and you may need to consider replacing it.
Once you have assessed the condition of the tank and decided to proceed with repairing it, you can start by draining the fuel. If your bike has a petcock, set it to OFF. Otherwise, make sure the ignition and fuel pump are switched off. Locate the fuel line connecting the gas tank to the fuel injectors or the carburetor. This is usually made of rubber and secured with clamps. Prepare a container to catch the fuel, then loosen the fuel line clamps with pliers and pull them off. If your bike has a petcock, set it back to ON to let the fuel out. Alternatively, use a siphon pump to drain the fuel. Remember to dispose of old or rancid fuel safely.
If your tank has cracks or small holes, seal them using rubber or vinyl vacuum caps. You can also use a small trash can covered with an old t-shirt or a disposable tarp to catch any remnant gas and particles. With the tank cap off and the petcock valve removed, rinse the tank with water, capturing the contents in the trash can. This step will help remove any remaining fuel and particles, including rust. Ensure you dispose of the chemicals and gasoline slurry properly.
After draining and rinsing the tank, you can proceed with the next steps to repair and restore it. Remember to refer to the specific instructions for the method you choose to treat the rust.
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Treat the rust with vinegar or soda solution
To treat rust with vinegar, start by removing the fuel tank and emptying it of fuel. Seal the holes in the tank with plugs, stoppers, vacuum caps, threaded fittings, or silicone plugs. Then, fill the tank with distilled white vinegar, which contains acetic acid that will dissolve the rust. For mild cases of rust, let the vinegar sit overnight, and for more severe cases, let it sit for several nights. If you have access to a tumbler, you can also try spinning the tank for hours with drywall screws inside to help loosen and break up the rust.
After treating the rust with vinegar, discard the vinegar and flush the tank thoroughly with clean water. Work quickly to prevent new surface rust from forming. Add half a quart of rubbing alcohol, shake it around, and then dump it out. Repeat this process with the remaining alcohol to displace the water and evaporate it, leaving a completely dry surface.
Alternatively, you can use a baking soda solution to treat rust. Rinse the tank with the baking soda solution to neutralize any remaining acid residue and prevent damage to the metal inside. Drain the tank and rinse it with clean water, then drain it again.
It is important to note that vinegar is generally preferred over stronger acids because it is inexpensive, non-toxic, widely available, and less likely to damage the tank's metal. Stronger acids, such as phosphoric acid or muriatic acid, can complete the derusting process quicker but require extreme dilution for disposal and pose a higher risk of personal injury.
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Seal the tank and coat it
Sealing and coating your fuel tank is a crucial step in preventing future rust and corrosion. Here is a detailed guide to help you through the process:
Before sealing, it is essential to thoroughly clean the tank and remove any traces of rust, debris, and old fuel. This can be done using various methods, such as flushing the tank with water, as suggested by one source, or using white vinegar, as recommended by another. White vinegar is a cost-effective solution; simply fill the tank with vinegar and add some coins. Let the mixture sit for several days, and then drain and shake the tank rigorously to remove any remaining rust flakes.
Once the tank is clean and dry, it's time to seal it. There are different products available for sealing fuel tanks, such as epoxy sealers or fuel-resistant, two-component paints. Caswell, for instance, offers an epoxy sealer that can be used for this purpose. It is important to follow the manufacturer's instructions when using these products to ensure proper application and curing. Make sure to pay extra attention to any scratches, dents, or cracks in the tank, as these areas will need to be thoroughly coated with the sealant.
If you're using a paint or coating, ensure that the tank surface is absolutely clean and free of any residue. Zinc is mentioned as an ideal coating material, but it is acknowledged that this may be difficult to source and apply. A fuel-resistant, two-component paint could be a more accessible alternative.
Finally, it is recommended to consider installing a fuel filter after sealing and coating your tank. This will help catch any potential debris or rust particles that may have been missed during the cleaning process, providing an extra layer of protection for your fuel system.
Remember, working with chemicals and coatings requires proper safety equipment and a well-ventilated workspace. Always refer to the manufacturer's instructions and take the necessary precautions to ensure your safety during the sealing and coating process.
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Replace the fuel pump and fuel filter
If you plan to refinish the tank, it is recommended to replace the fuel pump as well. Modern, returnless fuel systems have the filter integrated into the assembly and will usually come with the new pump. However, older vehicles may have a separate fuel filter installed in the line coming from the tank. These filters should be replaced at the same time as the pump to prevent debris from contaminating the new unit.
Before replacing the fuel pump, it is important to gather all the necessary tools and equipment, including a new fuel pump, fuel filter, and any other components specific to your vehicle. It is also crucial to reduce the amount of fuel in the tank to prevent spillage and messiness. Additionally, the area around the fuel pump should be cleaned to prevent dirt and debris from falling into the fuel tank.
To replace the fuel pump, follow these steps:
- Compare the replacement pump to the new pump assembly to ensure a match.
- Install the new seal ring and new pump assembly in the tank.
- Reconnect the fuel hoses, electrical connections, and emissions hoses.
- Reinstall the in-floor access cover and the rear seat or rear seat cushion as necessary.
- Reconnect the negative battery cable.
- Fill the fuel tank as needed.
It is important to note that replacing a fuel pump can be expensive and time-consuming, depending on the type of car you have. On modern vehicles, the part itself can cost hundreds of dollars, and the labour can add to the overall cost.
As for the fuel filter, it is recommended to install a new one when replacing the fuel pump to prevent any issues with debris. The process of replacing the fuel filter will depend on its location, which can vary between vehicles. Some fuel filters are located underneath the vehicle, while others are located in the engine compartment.
For external fuel filters, the following steps can be taken:
- Safely raise and support the vehicle using a jack and jack stands.
- Set the parking brake and chock the wheels.
- Relieve the fuel system pressure by removing the fuel pump fuse or relay, then running the vehicle until it dies from a lack of fuel.
- Push the end of the fuel filter into the quick-connect fitting until you hear a click, indicating that it is secure.
- Reinstall any clips and/or retainers as needed.
- Push the rubber hose down onto the filter and secure it in place with a clamp.
- Repeat the above steps on both sides of the fuel filter.
- Restore fuel pressure by reinstalling the fuse or relay.
- Safely remove the jack stands and lower the vehicle.
- Start the engine and check for any fuel leaks.
By following these steps, you can effectively replace the fuel pump and fuel filter in your vehicle.
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Frequently asked questions
Open the gas tank cap and shine a flashlight inside to check for rust. If you see reddish-brown flakes, your tank is rusty. You can also drain a small amount of fuel into a clear container and look for rust particles or debris.
First, remove the fuel tank and drain the fuel. Then, you can try filling the tank with a rust treatment such as white vinegar, caustic soda, or Evaporust, and letting it sit before emptying and rinsing the tank. You can also try using nuts and bolts to scrape the rust. Once the rust is removed, seal the tank.
To prevent rust from forming, ensure that your fuel tank is free of moisture and properly sealed. Regularly inspect your fuel tank for signs of rust and treat it with a rust inhibitor if necessary.
