Berryman B-12 CHEMTOOL FUEL INJECTOR CLEANER (part #0116) as an in-tank additive will clean the entire fuel system, including fuel pump, fuel lines, injectors, and intake valves, but it does not come in contact with the throttle. For that application, Berryman AIR-INTAKE & THROTTLE BODY CLEANER (part #2209) or B-12 CHEMTOOL CARBURETOR, CHOKE & THROTTLE BODY CLEANER (part #0117) would be the appropriate products.