fuel treatment for boats

The Best Fuel Stabilizer For Boats 2019

The fuel that is left in your boats motor will evaporate and oxidize when left for a long period of time. Adding a fuel stabilizer during the winter season where you are less likely to be running the engine is highly recommended

The best fuel stabilizer is the STA-BIL 360 Marine with Vapor Technology that protects both the outboard motor and fuel system.

Leaving fuel to age whilst inside the outboard motor will eventually cause damage but it is easily avoidable. Using a marine fuel stabilizer ensures that the fuel can be safely left inside the motor for years to come.

Best Marine Fuel Stabilizer

Fuel StabilizerDuration32oz Treatment
STA-BIL 3602 Years160 Gallons
Sea Foam SF Liquid2 Years45 Gallons
PRI-G3 Years512 Gallons
Star Tron Enzyme2 Years512 Gallons
Sentry New Technology2 Years80 Gallons
Briggs & Stratton3 Years80 Gallons

The benefits of using a fuel stabilizer is not only for protection but it will also improve fuel economy, restore lost engine power, increase durability and much more. It is a cheap product to buy but comes with so many benefits for boat owners.

The magic ingredient in most marine fuel stabilizers is hydro-treated paraffinic distillate and solvent naphtha. These two elements prevent the ethanol in the gas turning to crud and clogging the fuel lines of your engine.

If you are planning on storing your boat during the winter season, it is highly recommended to use this product. Below is a list of the best fuel stabilizers to prevent stored fuel causing damage to your motor.

STA-BIL 360 Marine Fuel Stabilizer


The Sta-Bil 360 Marine stabilizer is a 5 in 1 formula that cleans the fuel system, maximizes fuel economy, prevents ethanol damage, increases engine power and removes water from the tank.

Features of the Sta-Bil 360 Marine Stabilizer include:

  • Made in the USA
  • Advanced vapor technology
  • 1 ounce treats 5 gallons of fuel
  • Stabilizes fuel for up to 2 years
  • Prevent corrosion damage
  • Available in a 8, 10 or 32 oz bottle

Unlike many other alternatives, this is suited for boat engines and other related water based engines. This is mostly due to the vapor technology that removes water from the tank and helps prevent corrosion damage.

Overall, it is the best marine fuel stabilizer you can buy and is ideal for boats, jet skies and all other watersports engines that are kept stored in the winter.

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Sea Foam Fuel Stabilizer & Treatment


The Sea Foam motor treatment is by far the most popular fuel stabilizer within this article. It is suitable for both automotive and marine motors as well as being able to treat both gasoline and diesel motors, which is fairly unique.

Other features of the Sea Foam Motor Treatment include:

  • Stabilizes fuel for up to 2 years
  • 32 oz stabilizes 45 gallons of fuel
  • Clean fuel deposits and sticky residues
  • Contains no harsh detergent or abrasive chemicals
  • Only uses petroleum based ingredients within its formula
  • Lubricates upper cylinders
  • Can be used for 2 or 4 cycle engines

Sea Foam is a multi-purpose fuel treatment that does far more than your average fuel stabilizer. This is the reason why its so popular in the US but the only drawback is that you will require a lot of the additive to stabilize a large tank of fuel.

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PRI Boat Fuel Additive For Boats

The super concentrated PRI-G fuel stabilizer is suitable for all gasoline 2 and 4 stroke motors and works effectively to prevent damaging deposits and restore lost performance. In order to get the best bang for your buck, it is recommended going for the gallon bottle of this fuel stabilizer, which will treat over 2,000 gallons of fuel.

Other features of the PRI-G Fuel Stabilizer include:

  • Contains no alcohol
  • Prevents damaging deposits
  • Ideal for E-10 gasoline
  • Will work for up to 3 years
  • Promises to improve fuel efficiency and power

PRI-G is one of very few fuel treatments that contains no alcohol. This is important as solutions that contain alcohol have a tendency to dissolve salt, which then passes through all the fuel system that can cause issues. However, there are benefits to having the alcohol as it is a more powerful treatment.

Overall, the PRI-G is the best alcohol free fuel stabilizer you can buy and works out as a one of the cheapest fuel treatments per gallon.

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Star Tron Enzyme Marine Fuel Treatment


The Star Tron Enzyme is a concentrated formula that can be used with all gasoline engines on an everyday basis or for seasonal storage. Star Tron state that this solution will stabilize fuel for up to 2 years and bring the old fuel back to life.

Other features of the Star Tron Enzyme Fuel Treatment include:

  • 32 oz of the fuel stabilizer treats 512 gallons of gas
  • Stabilizes fuel for up to 2 years
  • Cure and prevents ethanol fuel problems
  • Cleans valves and injector for better performance
  • Available in a 8 or 32 oz bottle

In terms of using the Star Tron Fuel Stabililzer, it is recommended on the first dosage to use 1 ounce per 8 gallons on fuel. When refilling the tank, use 1 ounce per 16 gallons of fuel. The Star Tron formula is one of the best ethanol fuel treatments available and between this and the Sta-Bil, there is not much to split them apart.

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Sentry New Technology Fuel Treatment


Sentry is not a particular large brand in the boating industry but they produce reputable fuel treatments for a range of marine equipment. This SD formula treats gasoline engines and will eliminate water in the fuel system as well as stabilize fuel.

Other features of the Sentry Fuel Stabilizer include:

  • Stabilizes fuel for up to 2 years
  • 32 oz will treat 80 gallons of gas
  • Reduces smokes on startup
  • Cleans the fuel injectors
  • Eliminates fuel and water problems

It is suitable for all grades of small outboard motors that are 2 or 4 stroke and will increase lubrication and clean the fuel injectors at the same time. The Sentury ethanol fuel treatment is an excellent all rounder but it is slightly on the expensive side compared with the Sta-Bil and Star Tron alternatives.

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Briggs & Stratton Fuel Treatment


The Briggs and Stratton fuel treatment is the cheapest to buy within this article but it only treats 80 gallons of fuel per 16 ounces. However, this is more than adequate for boat owners storing boats with small engines.

Features of the Briggs & Stratton Fuel Treatment include:

  • Triple anti-oxidant protection
  • Dual corrosion inhibitors for metal parts
  • Stabilizles fuel for up to 3 years
  • Advanced 5-in-1 formula

The concentrated 5-in-1 formula is highly rated for gasoline engines with engine protection, easier starts and long life fuel stabilizing stated by the brand. For the low purchase cost of this fuel treatment, you cannot go wrong.

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Marine Fuel Stabilizer Buying Guide

Many boat owners when storing there boats for the winter season will forget about the leftover fuel. The ethanol that is present in gas can turn into a crud texture, which will get into the fuel system and cause issues.

Stabilizing your fuel is an essential procedure you should do before storing your boat. Luckily, as technology as improved, so have fuel stabilizers. They not only stabilize fuel but stop varnishing, lubricate the engine, remove water and so much more.

There are so many fuel stabilizers on the market that are targeted towards certain aspects, so its important to get the correct one. Below are some factors that you should consider before dumping the wrong solution into the fuel tank.

Fuel Stabilizer

How Do Fuel Stabilizers Work

After putting the magic potion in with the fuel, you are probably thinking how it works. As mentioned earlier, most fuel stabilizer uses a combination of paraffinic distillate and solvent naphtha, which produce a mixture that resists evaporation.

On top of resisting evaporation, the solution will also lubricate the fuel system and ensure all carbon deposits are removed from the surfaces. Fuel stabilizers are the go to fuel treatment for tackling ethanol problems from aged fuel left in engines.

Why Use Stabilizers

The main reason people who own boats, cars, lawnmowers and other combustion engines use fuel stabilizer is for storing fuel safely in the engine. However, the full list of benefits of using fuel stabilizers include:

  • Safely storing fuel for long periods in the engine
  • Improve fuel economy
  • Restore lost power
  • Protect against ethanol damage
  • Corrosion inhibitors
  • Lubricate vital components
  • … and much more

Considering they are cheap to buy, it would be silly not to use it before you store your boat. Many people go to the effort of putting a storage boat cover on their boat but forget to protect the engine!

Conclusion

Fuel stabilizers should be an important part of your maintenance schedule when putting your boat away in the winter. Using a high quality fuel treatment to protect against ethanol damage is highly recommended. The STA-BIL fuel stabilizer is the one to go for as an all rounder but many boat owners prefer the alcohol-free solution.

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