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This additive was designed specifically to treat small engines having a little trouble running. The fuel system cleaners go to work right away to start eating away at gum and varnish that cause rough or no starts. Everything from the tank to the carburetor and injectors will be cleaned out when using STA-BIL Fast Fix. This formula is compatible with all gasoline small engine equipment. Just pour in the tank and be on your way. The 4oz bottle will treat 10 gallons of fuel.