2 Best Fuel Additives (Fuel Stabilizers) for Jet Skis

Do you want to make your jet ski more fuel efficient and reduce the amount of pollutants that your jet ski emits into the water? The best fuel additive for jet skis will do just that. They help reduce carbon emissions and and can save you a lot of money on gas.

What is a fuel additive and fuel stabilizer for jet skis?

A Fuel Additive, also known as Fuel Stabilizer is a chemical or substance which you add to gasoline, diesel or other fuels in order to:

  • Increase engine’s energy output
  • Improve combustion and burn oil cleaner
  • Clean out existing deposits in engine
  • Lubricate the engine
  • Help prevent a flooded jet ski

The ethanol in gas can separate from the rest of the fuel. Since ethanol can take in humidity and liquid from the air, it can cause the fuel tank to corrode and create particles to build up. Fuel additive helps prevent ethanol from separating and keeps your tank clean and efficient. 

Best Fuel Additive and Fuel Stabilizer For Jet Skis

The best fuel additive for jet skis is the Fuel Ox Marine Winter Shock and the STA-BIL 360 Marine Ethanol Treatment and Fuel Stabilizer. Both fuel stabilizers are high quality and affordable.

Fuel Ox Marine Winter Shock

The Fuel Ox Marine Winter Shock is a great choice for fuel additive for a jet ski. One 16 ounce bottle costs $50, and will treat close to 1,000 gallons of fuel. It treats both gas and diesel engines (if you want to use it for a different machine). 

The Fuel Ox can stabilize the fuel in your jet ski for up to two years. It helps keep fuel compact and prevents ethanol from separating form the rest of the fuel. It also helps remove any sort of condensation or liquid that has built up in your tank. This is really important because buildup of water in your tank can make your engine inefficient, and is bad for the environment because it emits more toxins into the air. 

The Fuel Ox is also a great lubricant for you engine. It will help clean out any sludge build up in your tank, which greatly helps reduce corrosion. 

Best of all, there is a 100% money back guarantee if you are not satisfied with the product.  

STA-BIL 360 Marine Ethanol Treatment and Fuel Stabilizer

If you don’t want to spend $50, the STA-BIL 360 is another great option for a fuel stabilizer for your jet ski. You can buy a 10 ounce bottle for $15, which should be able to treat around 100 gallons. The bottle has a very long neck which makes it easy to pour into your jet ski gas tank. 

If you plan to store your jet ski in a humid area, STA-BIL is a great choice. It specializes in removing and preventing water build up, which prevents corrosion in your tank. This greatly helps improve fuel efficiency as your engine doesn’t have to work as hard to burn the water. It can also help fix your jet ski if your jet ski isn’t starting.

While this additive is usually used in ethanol based fuels, it can also be used in engines that use non-ethanol mixed fuel. It can stabilize gas for up to 1 year. 

This fuel additive also has a 100% money back guarantee. 

When do you use fuel additive for jet skis?

You typically put fuel additive in a jet ski when you plan on storing it for a long period of time. You should put the fuel additive into the tank the very last time you fill up your tank. That way the fuel additive can run through the engine and spread a little before you put up the jet ski for the winter. For more tips, you can check out my article on how to winterize a jet ski.

While it is usually used for when you plan to store your jet ski for an extended period of time, you can use fuel additive in-season. Along with fuel additive, you should also use an anti corrosion spray for your jet ski.

How do you add fuel stabilizer to jet ski?

You should put fuel additive in your jet ski right before you fill up your jet ski fuel tank. Pour the additive directly into your jet ski fuel tank before you fill it up with gas. You should only put new gas into the jet ski when you have fuel additive in it.

After your gas tank is filled, you should run your engine. The additive should be well-dispersed through your tank after 5 minutes. 


The last thing you want is for you jet ski to have starting issues when you bring it back onto the water in the beginning of the summer. Fuel additives are a great way to keep your jet ski gas tank and engine safe while it is stored. While it is not mandatory, I strongly suggest you put some fuel additive in your tank right before you store it for the winter. 

If you are interested in other ways to keep your engine healthy, check out my article on The Best 2 Stroke Oil for Jet Skis.
cheap jet ski supplies