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For all Electronic Fuel Injection and Direct Fuel Injection engines, Valvtect?s Marine Injector Cleaner restores power and performance and keeps gasoline engines running in 'like new' condition. One treatment completely cleans the entire fuel system of harmful, power robbing deposits, gum, and varnish. The advanced formula reduces hesitation, stops rough idle, reduces engine knock, improves power and performance, while reducing emissions. Marine Engine Injector Cleaner works on all engine components such as fuel injectors, intake valves, manifolds, fuel pumps, carburetors, combustion chambers, ports, fuel lines, and PCV valves. 12 oz. bottle treats 60 gallons.