We have multiple products that will provide fuel injector cleaning in gasoline engines. Berryman B-12 Chemtool Fuel Injector Cleaner (part #1112) will clean up dirty fuel injectors, and one bottle treats up 12-20 gallons of gas (4-6 bottles required). Berryman B-12 Chemtool Concentrated Intake Valve & Injector Cleaner (part #3012) is a bit stronger and will clean up dirty fuel injectors and intake valves, and one bottle treats up 12-20 gallons of gasoline (4-6 bottles needed). Berryman B-12 Chemtool Total Fuel System Clean-Up (part #2616) is our strongest detergent-based fuel additive and will thoroughly clean dirty fuel injectors, intake valves, and combustion chambers, and one bottle treats 16-21 gallons of gas (4-5 bottles required).