HOW TO CLEAN A RUSTED FUEL TANK Don’t let rust particles and contaminants in your fuel tank compromise your engine’s performance. Use EVAPO-RUST to restore your car, bike, lawn mower, or generator’s fuel tank to like-new condition – completely free of rust! Best of all, EVAPO-RUST is acid-free, so it won’t harm the tank’s base metal, surrounding paint, or rubber plugs and hoses. The restoration process takes between 12 and 24 hours – depending on the extent of the rust – and effectively dissolve