Top 5 Fuel Stabilizers for Generator: No more Engine Damage

Many people drain fuel from their generators to store them safely. When power sits in your engine and fuel tanks for long, oxidation takes place. This oxidation creates new compounds that cause damages to the engine. That is why people drain fuel from their generators to prevent stale gas issues. But do you know? You can keep your fuel fresh and free from oxidation, along with the help of a fuel stabilizer.

Problems Associated with Storing Generators with Fuels:

  • Old fuel goes into the oxidation process quickly that causes damages to the engine.
  • Environmental changes in temperature cause condensation that promote the growth of bacteria and algae in fuel tanks.
  • Generator’s fuel tank and engine catch corrosion, rust, gum, and varnish.
  • The carburetor and fuel injectors get affected by erosion.
  • Old fuel degrades the engine’s performance.
  • The oxidizing power causes starting problems.


The only solution to prevent damages caused by old fuel is to use a fuel stabilizer. It absorbs water before the fuel does it. It keeps your engine and fuel tank free from rust and corrosion and lubricates your entire fueling system. Also, a fuel stabilizer increases the performance of the machine.

Generator Fuel Stabilizer Reviews





Check Price

STA-BIL 22214 Fuel Stabilizer

  • ideal for 2-stroke/4-stroke gasoline engine

  • 32 fluid ounce/bottle

  • treats up to 80 gallons of gasoline

STA-BIL 22254 Diesel Fuel Stabilizer

  • 32/128 fluid ounce

  • treat up to 320 gallons of diesel

  • keeps generator fuel fresh up to 12 months

PRI Fuel Stabilizer

  • Ideal for 2-stroke/4-stroke gasoline engine

  • treat up to 256 gallons of gasoline

  • prevents carbon build-up

Star Tron Gas Tank and Fuel System Cleaner

  • 64 fluid ounce bottle

  • treat up to 4 gallons of diesel

  • works for gasoline/diesel

Briggs & Stratton 100118 Fuel Treatment

  • 8 fluid ounce bottle

  • treats up to 40 gallons of gasoline

  • triple antioxidant protection

1. STA-BIL 22214 Fuel Stabilizer – Overall Best

STA-Bil fuel stabilizer for generator

Size: STA-BIL 22214 fuel stabilizer comes in a 32 fluid ounce pour bottle. But you can also go for other options starting from 4 ounces to 1 gallon.

Generator Support: If you have a 2-stroke or 4-stroke gasoline engine, this fuel stabilizer is made for you.

Fuel Treatment: It treats up to 80 gallons of gasoline. Use 1 ounce of fuel stabilizer to treat up to 2.5 gallons of gasoline. For small-sized generators having 3-gallon fuel tanks, use 1 ounce of stabilizer. And for more giant tanks, add the stabilizer accordingly.

Stabilization Time: There is no need to drain fuel before storing your generator. You can keep your generator filled with fresh fuel for up to 24 months. Even after 24 months, your generator’s engine will start easily and quickly.

Effectiveness: It extends the engine’s life by protecting it from rust, corrosion, gum, and varnish. Also, it cleanses the carburetor and fuel injector and prevents corrosion by removing water.

Weight: The weight of this product is 1.9 pounds. You can carry it anywhere easily.

My Opinion:

Pros: STA-BIL 22214 is one of the best fuel stabilizers for gasoline engines. It can keep fuel fresh for up to 24 months. It is compatible with both 2 cycle and 4 cycle generator engines. Also, its fuel treat rate is a decent one.

Cons: It is not suitable for diesel fuel.

2. STA-BIL 22254 Diesel Fuel Stabilizer – Supports All Diesel Engines

STA-Bil Diesel Fuel Stabilizer

Size: Another fuel stabilizer in the list is from STA-BIL. It is available in both 32 fluid ounce and 128 fluid ounce sizes. You can go for any size to meet your needs.

Generator Support: It is safe for all diesel engines, so that you can add this stabilizer into your 2-stroke or 4-stroke diesel-powered generator. Keep in mind; it is not designed to work with gasoline.

Fuel Treatment: This 32 fluid ounce bottle can treat up to 320 gallons of diesel.

For everyday protection, use 1 ounce to treat 10 gallons of diesel. And for seasonal storage, mix 1 ounce of stabilizer into 5 gallons of diesel.

Stabilization Time: Your diesel will remain fresh in your generator for up to 12 months.

Effectiveness: STA-BIL 22254 is quite an effective fuel stabilizer that cleans and lubricates the complete fueling system. You will never find corrosion, sludge, and sediment in your diesel fuel tank and engine. Also, it diminishes the chances of oxidation. Moreover, it boosts the performance of the machine.

Weight: It weighs 2.07 pounds.

My Opinion:

Pros: STA-BIL 22254 fuel stabilizer is made for all diesel engines. Its fuel treat rate is excellent. It not only lubricates fuel injectors but also reduces oxidation of diesel.

Cons: Its bottle design is not perfect. It leaves 2-3 ounces in the bottle.

3. PRI Fuel Stabilizer – Highest Fuel Treatment Rate

PRI Gasoline Fuel Economy Booster

Size: It comes in a 16 fluid ounce bottle.

Generator Support: Whether you have a 2-stroke or 4-stroke gasoline engine, it works with both of them.

Fuel Treatment: It can treat up to 256 gallons of gasoline. Only 1 ounce of stabilizer will be enough to treat 16 gallons of gasoline. It means you can easily store your big-sized gasoline generator with only 1 ounce of fuel stabilizer.

Stabilization Time: Your fuel will remain stable for months without any doubt.

Effectiveness: It improves the engine’s performance and prevents carbon build-up in fuel tanks.

Weight: It weighs 2 pounds because of its bottle size.

My Opinion:

Pros: PRI 16G fuel stabilizer supports both the 2-stroke and 4-stroke gasoline engines. It improves fuel efficiency and protects fuel tanks from damaging deposits. Also, its one bottle is enough for extended use.

Cons: Its bottle is more prone to spilling.

4. Star Tron Gas Tank and Fuel System Cleaner – Supports Both Gasoline and Diesel Engines

Star Tron fuel stabilizer

Size: This Star Tron fuel stabilizer from Star Brite comes in a 64 fluid ounce bottle.

Generator Support: It works with both gasoline and diesel-powered generators.

Fuel Treatment: Its 1 ounce will treat up to 4 gallons of diesel or gasoline. And a whole bottle can treat up to 250 gallons of fuel. If your generator has a 4-gallon fuel tank, add 1 ounce of Star Tron and store it safely.

Stabilization Time: Your gasoline or diesel fuel will keep fresh for months.

Effectiveness: It will not only keep your fuel fresh but also make your old energy new again. You will not find any sludge and other fuel contaminants in your fuel tanks after adding this fuel stabilizer.

Weight: The weight of this fuel stabilizer bottle is only 1 pound.

My Opinion:

Pros: Star Tron works with both gasoline and diesel fuel tanks. It not only cleans tank walls but also adds life to the old fuel.

Cons: You can only store your generator with fuel for six months.

5. Briggs & Stratton 100118 Fuel Treatment – Highest Stabilization Time

B&S Fuel Stabilizer

Size: Briggs & Stratton 100118 comes in an eight fluid ounce bottle.

Generator Support: You can either use it to protect your 2-stroke or a four-stroke gasoline engine.

Fuel Treatment: One bottle can stabilize up to 40 gallons of gasoline.

Stabilization Time: Your fuel will remain in a stable condition for up to 3 years.

Effectiveness: It offers triple antioxidant protection to your gasoline tanks.

Weight: Its weight is 0.5 pounds.

My Opinion:

Pros: Briggs & Stratton 100118 can keep your fuel stabilize for up to 3 years. It works with both 2-stroke and 4-stroke engines and protects them from rust and corrosion.

Cons: It fails to work on diesel fuel.

Buyer’s Guide

Before buying a fuel stabilizer for your generator, make sure you have checked its various features. In this guide, we will discuss the essential elements to look at when buying a fuel stabilizer.


Your fuel stabilizer must be compatible with the engine of your generator. Some fuel stabilizers only work with gasoline-powered machines, whereas some are made to treat diesel fuel engines and tanks. Therefore, it is essential to pick a gasoline fuel stabilizer for gasoline engines and a diesel fuel stabilizer for diesel-powered engines.

Also, before purchasing, make sure your fuel stabilizer works with both 2-stroke and 4-stroke engines. It will help you to use one stabilizer for both types of machines.


Always select the fuel stabilizers of well-known brands. It will help you to get the best quality product. STA-BIL, Star Brite, Royal Purple are famous fuel stabilizer brands.

Bottle Size

Fuel stabilizers come in different bottle sizes. If you are going to use a stabilizer for your generator’s everyday protection, you must go for a 64 or 128 fluid ounce bottle. Or if you are going to use it only for seasonal storage, then an 8 or 16 fluid ounce bottle is enough for you.

Stabilization Time

Stabilization time also needs to be considered as it determines how long you can leave your generator with fuel.

The stabilization time of most of the fuel stabilizers is up to 2 years. So, it is better to go with a product that offers two years of fuel stabilization.

Ease of Use

Make sure your fuel stabilizer bottle offers easy pouring. Also, it’s mixing with fuel must be fast and easy.


Is it required to follow the mixing ratio of a fuel stabilizer?

Yes, it is much required to follow the mixing ratio. If not followed, the fuel stabilizer will damage the engine as well as make the fuel non-usable.

How long will a fuel stabilizer keep the fuel stabilized?

It depends on the type of product you are using. Most of the well-known brands keep your fuel stable for up to 12 or 24 months.

Can a fuel stabilizer make a lousy fuel reusable?

A fuel stabilizer can only keep your fuel fresh during storage. It is not linked with the conversion of second-rate energy into the right power.

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