Want to maximize fuel efficiency and avoid problems such as rough idling, weak acceleration, stumbling and stalling? STP fuel additive products can help. Our redesigned fuel additive bottles are compatible with cap-less fuel tanks. STP Super Concentrated Fuel Injector Cleaner contains concentrated detergents that help dissolve and remove harmful carbon, gum, and varnish deposits on fuel injectors. Without cleaning, deposits can lead to hard starts, lost acceleration and rough idling. This product is made with jet fuel, a high-quality carrier of active ingredients.