10 Best Complete Fuel System Cleaner of December 2025

• For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.

Chevron

• Red Line

Red Line

• Cleans entire fuel system (injector valves, injectors, valves, combustion chamber) to restore fuel economy; exact Original Equipment Manufacturer fluid that your vehicle came with
• Approved and recommended by Hyundai Motor America
• A single tank treatment is recommended during every oil change or as often as every 3,000 miles
• Protects fuel level sensor
• Treats up to 20 gallons of gasoline

HYUNDAI

• Save gas by keeping fuel intake system clean
• Helps restore performance
• Removes deposits from entire fuel system
• Helps inhibit corrosion
• Compatible with cap-less fuel tanks

STP

• Formulated to help save gas and lower emissions by deep cleaning the entire fuel system
• Formulated to help restore peak performance and reduce friction by lubricating engine parts
• Formulated to help prevent ethanol deposits and inhibit corrosion
• Works with modern gasoline engines such as turbo, direct inject and hybrid vehicles
• Compatible with cap-less gas systems ›

STP

• Removes deposits from port/indirect fuel injectors, intake valves and ports, piston tops, cylinder heads, combustion chamber
• Prevents future carbon buildup
• Conditions fuel to fight ethanol and water corrosion
• Maximizes performance and fuel economy
• Reduces emissions

Gumout

• Cleans, restores, protects the entire fuel system (fuel injectors, carburetors, intake valves and combustion chambers)
• Restores: lost power, acceleration, lost fuel economy, and operation of the fuel gauge sensor
• Reduces: rough idle, engine surge, hesitation, and spark plus fouling
• Improves: cold start performance, and fuel stability for up to one year
• Automobiles and trucks use every 3, 000 miles or at your next oil change. All other gasoline engines use as needed (motorcycles, dirt bikes, boats, ATVs, RVs, water craft, lawn care, etc.)

TECHRON

• Red Line

Red Line

• Designed to exceed expectations - Red line complete SI-1 fuel system cleaner treatment for cleaning & preventing corrosion in fuel systems
• Perform & protect - Fuel additive cleans injectors, carburetors, valve & combustion chamber deposits with a powerful concentrated blend of high-temp and low-temp detergents
• Efficient fuel burn - Gas treatment that enhances gasoline stability, while reducing the buildup of gum and varnish formation
• Easy to use - Use one bottle per tank for most effective treatment, additive cleans nearly 100% efficiency in one treatment
• Why red line - Established in 1979, red line products perform & protect better than any on the market. No compromises

Red Line

• Complete fuel system cleaner improves performance across the fuel system
• Uses PEA (polyether amine) to effectively remove carbon deposits other products can't
• Conditions fuel to fight corrosion, extending the life of key engine parts
• Reduces friction and wear in the upper cylinder, improving horsepower and fuel economy
• Cleans direct and indirect fuel injectors, intake valves and ports, piston tops, cylinder heads, and combustion chamber

Gumout