Todays fuel additives protect the fuel, and the parts of the fuel system covered by fuel. STA-BIL 360° Marine Ethanol Fuel Treatment and Stabilizer provides new technology that goes above and beyond this, providing the ultimate corrosion coverage where other additives dont. This additive releases a corrosion preventing vapor that coats all metal parts of the fuel system (both above and below the fuel line), including: the fuel tank, fuel sending unit, intake manifold, valves, and carburetor/fuel injectors, leaving your entire fuel system protected from fill up to fill up. 12 oz. bottle treats up to 120 gallons. 40 oz. bottle treats up to 400 gallons.