10 Best Fuel Additive For Outboard Motors of December 2025

• Great for cleaning up existing deposits in untreated fuel lines, tanks, carburetors, injectors, intake valves, and spark plugs
• Keeps your fuel fresh for up to three months
• Can be used in all 2 and 4 cycle carbureted and fuel-injected gasoline engines
• Use one ounce to treat every 10 gallons of fuel.

MERCURY

• Improves power and efficiency in two and four stroke engines
• Removes and prevents carbon and varnish deposits from injectors, carburetors, intake valves, intake ports and combustion chambers
• Fights corrosive elements of sulfur in Ethanol blended fuels
• Use with Yama lube Fuel Stabilizer and Conditioner PLUS to prevent any harmful effects

YAMAHA

• Cures and prevents ethanol fuel problems; helps prevent phase separation
• For everyday use and seasonal storage; stabilizes fuel for up to 2 years and can help rejuvenate old, sub-spec fuel
• Makes engines start easily and run smoothly; improves fuel economy and reduces emissions
• Cleans valves and injectors of carbon deposits, gums and varnish for maximum performance, increased fuel efficiency and reduced emissions
• Concentrated formula #930XX is economical to use in large and small applications; safe for use in all engines (including 2-cycle pre-mix)

STAR BRITE

• Helps prevent corrosion above and below the fuel line where no other additive can
• Ultimate treatment and protection against Ethanol blended fuels
• Helps clean fuel system to improve performance
• Stabilizes fuel up to 12 months
• Helps increase power and fuel efficiency

STA-BIL

• Cleans injectors, carb jets and passageways
• Cleans and lubricates intake valves, pistons and cylinders
• Dissolves and cleans fuel residue in fuel systems
• Dissolves oil deposits in crankcase
• Clean timing chain tensioners and VVT actuators, quiet noisy lifters
• 100 percent pure petroleum
• EPA registered product
• Liquefies gum and varnish deposits or internal engine contaminants
• Special Shipping Information: This item cannot be returned and has additional shipping restrictions
• Special Shipping Information: This item cannot be returned and has additional shipping restrictions

Sea Foam

• New

YAMAHA

• Quickleen For use as needed throughout the boating season
• Aggressive cleaners work to quickly and thoroughly remove carbon deposits from carburetors and injectors, intake valves, spark plugs, piston crowns, and cylinder heads
• Prevents engine knocking and piston seize-up as well as Extends spark plug life
• This product does not contain fuel stabilizers. Use with Quickare to prevent fuel breakdown and oxidation.
• 1 ounce treats 5 gallons - 12 ounce bottle treats 60 gallons

Mercury Marine Mercruiser

• 【DURABLE MATERIAL】 HIDEA fuel tank is made of high-density polyethylene as the base material and anti-static additives, featuring in anti-ultraviolet, anti-aging, impact resistance, corrosion resistance and acid resistance. It can naturally rebound without permanent deformation after encountering an impact. In addition, electric sparks will not be generated during friction and impact to cause explosion.
• 【SUPERIOR DESIGN】 The three-dimensional texture surface not only increases the aesthetics of the gas can, but also optimizes the feeling of holding a hand, making the force is even and the hand is not restrained. Equipped with an I-shaped lifting handle, which is more ergonomic, convenient and fast, easy to carry and store.
• 【SELF-VENTING SPOUT】 With a screw-in cover with a breather hole, it can automatically vent, which helps to form a smooth fuel flow, thereby minimizing leakage. A filter is built into the air inlet of the fuel tank to prevent dust and foreign matter from entering.
• 【EXQUISITE DETAILS】 The integrated design of the fuel tank cap and the intake valve makes it more convenient to use. The air inlet and the oil outlet are separated to prevent oil from spilling out. Moreover, the pure copper interface has a more complete process and a longer service life. An oil volume indicator allows you to clearly understand the changes in the oil tank and the remaining oil volume and replenish it in time.
• 【LARGE CAPACITY】 Gas tank size: 19.82 x 13.50 x 9.16 in. Large-capacity: 6 gallon (24L). Comply with EPA and CARB (California Air Resources Board) regulations. It can provide fuel for a variety of power equipment, such as lawn mowers, chain saws, yard appliances, recreational vehicles, motorcycles, outboard motor, etc.

Hidea

• ✔ INCREASES FUEL ECONOMY : Fuel Ox Marine contains a patented combustion catalyst that provides a more complete combustion. This allows for more productive burn of fuel.
• ✔ PROTECTS AGAINST ETHANOL : Fuel Ox Marine coats fuel tank and system to prevent corrosion from ethanol found in gasoline.
• ✔ REMOVES WATER : Fuel Ox Marine is a demulsifier for the water that is in fuel. It will separate the water suspended in gas or diesel and filter out through your boat's or watercraft's racors, separators, or filters. It prevents water from passing through engine and significantly slows the process of phase separation.
• ✔ BOOSTS POWER : Fuel Ox Marine contains a patented combustion catalyst that provides a more complete combustion. This more complete burn allows for more BTUs to be burned increasing octane two points and increasing the power of the boat or watercraft.
• ✔ 1OZ TREATS UP TO 80 GALLONS OF GAS OR DIESEL : Fuel Ox Marine has a highly concentrated formula that treats both gas or diesel for a small and convenient inventory.

The Fuel Ox

• Cures and prevents ethanol fuel problems
• Helps prevent phase separation
• Makes engines start easily, run smooth
• Stabilizes gasoline for up to 2 years
• This item is not for sale in Catalina Island

STAR BRITE