3M Universal Fuel Injector Cleaner (100 psi Can) is a proprietary blend of high octane fuel and solvents, designed to run the engine during the cleaning procedure while cleaning the injectors as the cleaner passes through themDeveloped in the 1980's as a concentrated cleaner formulated to clean fuel injectors on gasoline engines. It is a disposable pressurized can that requires specialized hardware to administer. It is designed to be attached directly to the engine fuel system with appropriate 3M adapters and hardware. When connected properly, the engine runs on the contents of the can.For best results, use this product together with 3M Fuel Injector Cleaner Tank Additive 08812 and an aerosol can of 3M Throttle Plate and Intake Cleaner 08866. Application instructions are vehicle specific.