Thoroughly cleans entire fuel system of all high mileage gas-powered vehicles, including those exceeding 60, 000 miles. Powerful detergents and H. E. S. T. solvents give one-tank clean-up of fuel injectors, intake valves, carburetor, and combustion chambers. Dissolves fuel residue and carbon deposits to restore lost power, reduce rough idle and hesitation, restore octane requirements, and improve overall drivability.