fuel treatment for boats

5 Best Fuel Stabilizer For Boats 2019

The fuel that is left in your boats engine will evaporate and oxidize when left for a long period of time. Adding a fuel stabilizer for 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 engine and fuel system.

Leaving fuel to age whilst inside the engine will eventually cause damage but this damage is easily preventable. Using a fuel stabilizer ensures that the fuel is safe inside the engine for years to come.

Best Fuel Stabilizer For Small Engines

Fuel StabilizersDuration32oz Treatment
STA-BIL 3602 Years160 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 the engine.

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.

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.

It is a US made solution that stabilizes fuel to ensure it is kept fresh when the boat is stored. Usage of the Sta-Bil is recommended at every fill up and 1 ounce treats up to 5 gallons of fuel.

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.

Check it Out

PRI Boat Fuel Stabilizer

The super concentrated PRI-G fuel stabilizer can treat up to 512 gallons of fuel from just 32 ounces. It is suitable for all gasoline 2 and 4 stroke engines and works effectively to prevent damaging deposits and restore lost performance.

Although it is a similar price to the Sentury alternative, the impressive 512 gallon of fuel it treats cannot be matched by any other fuel stabilizer. So in actual fact, it works out as the cheapest fuel stabilizer per gallon of fuel.

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 cheap fuel treatment per gallon.

Check it Out

Star Tron Enzyme 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 benefits of this marine fuel treatment are cleaning of the valves and injectors, increased fuel efficiency and reduced emissions. It is a popular method of curing and preventing ethanol fuel problems that many engines suffer from.

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, use 1 ounce per 16 gallons of fuel, although these are rough guidelines and overdosing will not cause any harm.

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.

Check it Out

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.

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. Each 32 ounce bottle will treat up to 80 gallons of fuel and it is perfect for the marine environment.

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.

Check it Out

Briggs & Stratton Fuel Treatment

The Briggs and Stratton fuel treatment is the cheapest to buy in 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.

It targets ethanol problems head on with triple anti-oxidant protection and corrosion inhibitors. In terms of stabilizing, it is the longest as it stabilizes fuel for up to 3 years.

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

Check it Out

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.

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!


Fuel Stabilizers are an important part of maintenance 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.

Leave a Reply

Your email address will not be published. Required fields are marked *