PJ1 13-12 Injector and Carburetor Cleaner, 12 oz PJ1 Fuel Injector and Carburetor Cleaner is a multi-functional concentrated intake system cleaner Designed to clean and maintain fuel injector/carburetor systems and intake valves with one treatment Keeps injectors/carburetors at their peak performance while removing soft carbon from the combustion chamber Will not harm catalytic converters or negatively interact with PJ1 lubricating oils Cleans the entire fuel system as you drive