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 Complete Fuel System Cleaner removes deposits from your entire fuel system. This STP formulation helps clean your entire fuel system in order to restore it to its optimum operating condition. It contains jet fuel, a high-quality carrier of active ingredients.