Top 10 Best Fuel Additive For 4 Stroke Outboard In [2022]

1. YAMAHA ACC-RNGFR-PL-12 Yamalube Ring-Free Fuel Additive

  • 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

2. STA-BIL Storage Fuel Stabilizer – Guaranteed To Keep Fuel Fresh Fuel Up To Two Years – Effective In All Gasoline Including All Ethanol Blended Fuels – For Quick, Easy Starts, 4 fl. oz. (22205)

  • Keeps fuel fresh for up to 24 months during storage
  • Eliminates the need to drain fuel prior to storage
  • Ensures quick, easy starts after storage
  • Prevents gum and varnish build-up
  • Effective in all gasoline, including Ethanol blends

3. STAR BRITE Star Tron Enzyme Fuel Treatment SEF Gasoline Formula – 1 oz. Treats 6 Gallons – 1 OZ Twin Pack (14301)

  • 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
  • Small Engine/Automotive Formula 143XX is easy to mix in fuel tanks under 48 gallons; safe for use in all engines (including 2-cycle pre-mix)

4. Mercury Marine Quickleen Engine and Fuel System Cleaner, 12 Ounces 92-8M0047931

  • 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

5. Quicksilver 8M0058681 Quickleen Engine and Fuel System Cleaner – 32 Ounce Bottle

  • Maximizes engine performance by eliminating carbon deposits
  • Prevents engine knocking
  • Extends spark plug life
  • 32 ounce bottle
  • For use in all 2‐ and 4‐cycle carbureted and fuel‐injected gasoline engines

6. Mercury Marine Quickare Fuel Treatment, 12 Ounces 92-8M0047930

  • SKU: 92-8M0047930
  • Sold Each
  • Please verify your own fitment

7. STA-BIL 360 Marine Ethanol Treatment and Fuel Stabilizer – Prevents Corrosion – Helps Clean Fuel System For Improved In-Season Performance – Treats Up To 80 Gallons, 8 fl. oz. (22239) , Black

  • STA-BIL 360 Marine 8 fl. oz.
  • Enhanced water removal properties; perfect for Marine environments
  • Prevents fuel system corrosion. Helps clean fuel system for improved in-season performance. Keeps fuel fresh for up to 12 months.
  • Helps increase engine power and gas mileage

8. Yamaha Outboard Ring Free Plus Fuel Additive Quart (32 ounce) ACC-RNGFR-PL-32

  • Synthetic PLUS formula provides superior deposit control, cleaning fuel injectors, carburetors, intake valves, intake ports, and combustion chambers
  • Featuring metal filmers, it also protects silver solder, copper, aluminum, and steel in a fuel system from the corrosive affects of ethanol sulfate salt.
  • Yamalube Oils
  • Yamalube

9. STAR BRITE Star Tron Enzyme Fuel Treatment – Concentrated Gasoline Formula – 1 oz. Treats 16 Gallons – 16 OZ (093016SS)

  • 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)

10. STA-BIL Fast Fix – Small Engine Treatment, Cleans Carburetors and Injectors, Fixes Rough Running Engines, Eliminates Water, Treats Up to 20 Gallons, 8oz (22304)

  • FIXES ROUGH RUNNING ENGINES – STA-BIL Fast Fix eats away at gum and varnish that cause rough starts and no starts in your small engine equipment. This easy-to-use fuel additive combats the effects of ethanol blended gasoline.
  • ELIMINATES WATER – This fuel injector cleaner helps to remove water that may get into your fuel system. Penetrating deep into the fuel line, this simple fuel additive prevents the need to disassemble the engine. The 8 oz. bottle of this alcohol-free fuel additive treats up to 20 gallons of fuel.
  • VERSATILE – Compatible with all small engines, adding STA-BIL Fast Fix to your 2-cycle or 4-cycle small engine cleans carburetors and injectors while acting as a water remover. Use this product in your lawn mower, chainsaw, trimmer, snow blower, generator, and more.
  • DIRECTIONS – For rough running engines use 1 oz. of STA-BIL Fast Fix per 2.5 gallons of fuel. Fill with fresh gas. Start the engine and allow to run for 15 minutes to allow the additive to work its way through the fuel system. If the engine does not start, attempt to turn it over a few times so the additive makes its way through the fuel system and allow to sit overnight. Attempt to start again, if problems persist you may need to have it looked at by a mechanic.
  • SHELF LIFE – All STA-BIL branded products are good for use up to 2 years after the bottle was opened. Be sure to mark the date you opened the bottle on the back of your package! Proudly made in the USA by a family-owned company in Chicago, Illinois.

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