BG 44K Fuel System Cleaner 2 Pack. BG 44K fuel system cleaner, added to gasoline, quickly and effectively cleans the entire fuel system, including fuel injectors, intake valves, ports and combustion chambers. Because it provides efficient removal of upper engine deposits, BG 44K reduces problems caused by deposit build-up such as engine surge, stalling, stumble, hesitation and power loss. BG 44K quickly restores engine performance and improves driveability. It will provide quick clean-up of coked fuel injectors and corrosive deposits on the fuel sending unit. It is compatible with all fuel system materials, alcohol-blended fuels, common fuel additives. Contains no alcohol. Catalytic converter, and oxygen sensor safe.