A clean supply of fuel is critical to the performance of your vehicle - hard starting, stumbling under load, and sluggish response may be symptoms that your car's fuel system is dirty. The best way to ensure that the fuel is clean is to be certain that the fuel tank is free of rust. This Gas Tank Sealer Kit seals minor leaks and can save you a great deal of time and money in trying to locate a replacement tank. For metal tanks up to 20 gallons. Kit contains one 7 oz. can of Metal Wash, 1 pint of Rust Remover, two 16 oz. bottles of Gas Tank Sealer.