Engine performance is affected by everything from carbon deposits and corrosion to heat and friction. Gumout All-In-One Complete Fuel System Cleaner uses P.E.A. (polyetheramine) to effectively remove carbon deposits other products can't for improved performance across the fuel system. All-In-One also helps extend the life of key engine parts by conditioning fuel to fight corrosion and helps improve horsepower and fuel economy by reducing friction in the upper cylinder.