Star Brite's fuel system and injector cleaner is engineered to quickly remove even the toughest performance-robbing deposits from carburetors, fuel injectors, pumps, valves, or rings that can form on even the newest engines. Formulated with a proprietary blend of enzymes and high-performance cleaning agents, the cleaner restores power and performance quickly. Simple to use formula treats up to 40 gallons of fuel. 4 oz.