Marine Fuel Additives

Improve Performance & Protect Your Engine with Marine Fuel Additives

Keep your boat’s fuel system running clean and efficient with marine fuel additives from The Outdoor Warehouse. These specialized treatments stabilize fuel, remove water, and prevent ethanol-related issues that can damage marine engines.

Also known as fuel stabilizers, ethanol treatments, injector cleaners, or fuel conditioners — all essential for protecting 2-stroke and 4-stroke marine engines from corrosion and poor combustion.

Why Use Marine Fuel Additives?

  • Prevents Ethanol Damage: Stops phase separation and corrosion caused by E10 fuel blends.
  • Improves Performance: Cleans injectors and carburetors for smoother starts and consistent power.
  • Extends Fuel Life: Stabilizes gasoline and diesel fuel during seasonal storage.
  • Protects Against Moisture: Removes condensation and water buildup in tanks and lines.

Types of Marine Fuel Additives

Type Purpose Key Benefits
Fuel Stabilizers Storage protection Keeps fuel fresh for 12+ months, prevents varnish & phase separation
Ethanol Treatments Daily protection Prevents corrosion and moisture buildup from ethanol-blended fuels
Injector Cleaners Fuel system cleaning Removes carbon deposits, improves throttle response
Octane Boosters Performance enhancement Raises octane for cleaner, more efficient combustion
Diesel Additives Diesel engines Improves cetane, lubricity, and cold weather performance

How to Choose the Right Marine Fuel Additive

Select a formula based on your engine type, fuel, and usage:

  • Seasonal boaters: Use a stabilizer before storage to prevent phase separation.
  • Frequent boaters: Add ethanol treatment every fill-up to control moisture and corrosion.
  • High-performance boats: Choose an injector cleaner or octane booster for better throttle response.
  • Diesel engines: Look for additives that increase cetane and lubricity for smoother operation.

Reminder

Always mix fuel additives according to manufacturer dosage instructions. Over-treatment can lead to buildup or fouling. Shake bottles before use and add directly to the tank before refueling for best mixing results.

Frequently Asked Questions

Do I need fuel stabilizer if I use my boat often?
Yes. Even in regular use, marine fuel additives help prevent ethanol corrosion and moisture buildup that occur in humid or coastal environments.
How much additive should I use?
Follow the label’s dosage instructions—typically 1 oz per 10 gallons of fuel. Always add the additive before fueling to ensure full mixing.
Can I use automotive fuel additives in a boat?
No. Use marine-specific fuel additives rated for ethanol and saltwater environments. Automotive formulas may lack corrosion inhibitors for marine engines.
Do fuel additives work with both gas and diesel?
Yes, but use the correct formula for your engine. Gasoline stabilizers and diesel conditioners are not interchangeable.

Why Buy Marine Fuel Additives from The Outdoor Warehouse?

  • Curated selection of marine fuel stabilizers, ethanol treatments, and injector cleaners.
  • Top brands: STA-BIL, Star Tron, Sea Foam, Yamaha, Mercury, and CRC.
  • All formulas are marine-rated and ethanol-safe.
  • Fast shipping and expert marine support nationwide.

Shop Marine Fuel Additives today at The Outdoor Warehouse — clean, protect, and optimize your boat’s performance.