How To Clean An Aluminum Fuel Tank Empty the fuel tank. Isolate the aluminum fuel tank. Wash the fuel tank out with water. Put a metal chain in the tank if there is a lot of rust inside of it and continue to rinse it out with water. Wash the fuel tank with acid wash or fuel tank cleaner. Click to see full answer. Thereof, how do you clean a metal gas tank?Vinegar. Vinegar can be used to clean rust from the inside of a gas tank because it contains acetic acid. This can be accomplished by filling the gas tank with water and then draining that. Next, plug the hole where the petcock goes, and fill the tank with the vinegar, leaving it in overnight to dissolve the rust.Secondly, how do you keep a gas tank from rusting after cleaning? I use naval jelly after an acid wash to prevent flash rusting and drain all the excess naval jelly back then rinse with a few cups of gas and then just fill her up or If dont have time or the gas to spare pour some two stroke oil in there. Correspondingly, how do you clean a petrol tank? Remove fuel pump from tank (avoid letting residual debris fall into the tank). Insert hose into fuel tank and begin pouring a stream of clean, hot water. While water is filling, spray mild detergent in the tank. If opening allows, use a brush to loosen debris from the sides of the tank.How do I clean out my gas tank without removing it? Pressure wash your fuel tank. Use a pressure washer to wash out all the debris, rust and dirt from the tank. Try to point your sprayer at various angles inside the tank so you can remove the rust from the fuel tank walls. Make sure you are wearing goggles as debris may get into your eyes.

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