Clean the Inside of the Tank: Before applying any sealer or treatment, it's important to clean the inside of the gas tank thoroughly. This will remove loose rust and debris, ensuring that the sealer adheres properly. You can use a combination of solvents, such as acetone or carburetor cleaner, and a wire brush to clean the inside of the tank. Make sure to rinse the tank thoroughly with water afterward to remove any traces of the cleaning solution.
Apply a Fuel Tank Sealer: Once the tank is clean and dry, you can apply a fuel tank sealer to protect it from further rust and corrosion. KBS sealer is a popular choice for this purpose, as it is resistant to gasoline and other automotive fluids. Follow the manufacturer's instructions for applying the sealer, which typically involves pouring it into the tank and allowing it to cure according to the specified time.
Repair or Replace Rusted Components: If there are any severely rusted components in the gas tank, such as the fuel sender unit or fuel lines, you will need to repair or replace them. This may involve sourcing used parts from a salvage yard or purchasing new components. It's important to ensure that all components are in good condition to prevent leaks and other issues.
Install a Fuel Filter: To protect the fuel system from any remaining rust particles or debris, you can install a fuel filter in the fuel line. The filter will trap any contaminants that may be present, preventing them from entering the engine and causing damage.
Test the Fuel System: Once you have completed the repairs and applied the sealer, it's important to test the fuel system to ensure that it is functioning properly. This involves checking for leaks, as well as verifying that the fuel is flowing properly through the system. You can do this by turning on the ignition and listening for any unusual noises or leaks.
Use a Rust Inhibitor: To prevent future rust from forming in the gas tank, you can add a rust inhibitor to the fuel. These additives are designed to protect metal surfaces from corrosion and can be purchased from automotive stores.
By following these steps, you can address the rust in the gas tank of your 1986 CRX-Si and help protect it from further damage. It's important to note that if the rust is extensive, you may need to replace the gas tank entirely, which would involve removing the old tank and installing a new one.
