Best Fuel Stabilizer for Generator in 2023 (Helpful Guide)

Whether a generator, vehicle, or other engines, including lawnmowers, motorbikes, snow blowers, etc., may require fuel drainage over time, especially when you store them in the off-season.

The reason is to keep your generator engine free from getting eroded because leaving the fuel might not be useful and lead to gas wastage which I think should be limited, but what should be the solution for this problem? Shouldn’t you opt for the best fuel stabilizer for the generator? 

Yes, it’s worth it! By opting for a fuel stabilizer, you not only provide safety to your machine but make it run efficiently, enhancing fuel economy and eliminating the need for drainage while storing your generator; using a stabilizer keeps the gas fresh for months, and with some top products over the years. 

Now that you know how necessary a fuel stabilizer is for your machinery, we have made it quite easy for you to select the best one by going through this detailed guide that will help you analyze various brands, their features, and the capability of choosing the best-desired product for your engine.

Go for the best brand to get worry-free and prevent water absorption while storing your unit during the off-season!

Are you in a hurry to skip reading the whole article? Wait! Go through our recommended pick to save your time and effort.

Given below is the comparison table showing the 10 best fuel stabilizers for generators selected for our today’s review.

Comparison Table Of Top 10 Best Fuel Stabilizers For Generators

Image	Product	Features	Price
Best Durable Fuel Stabilizer	STA-BIL Storage Fuel Stabilizer Quantity: 32 Fluid Ounces Fuel Treated Per Gallon: 1 Oz Per 2.5-Gallon Stabilizing Property: 2 Years	10	Check Price
Top Pick	Lucas Oil 10303 Quantity: 32 Fluid Ounce Fuel Treated Per Gallon: 1oz Per Gallon Stabilizing Property: 1 Year	10	Check Price
Best Concentrated Fuel Stabilizer	Star Tron Enzyme Fuel Stabilizer Quantity: 16 Fluid Ounce Fuel Treated Per Gallon: 1oz Per 16 Gallon Stabilizing Property: 2 Years	10	Check Price
Best Heavy Engine Fuel Stabilizer	Yamaha ACC-FSTAB-PL-32 Quantity: 32 Fluid Ounce Fuel Treated Per Gallon: 1 Oz Per 3 Gallons Or 1 Per 1gallon Stabilizing Property: 6 Months	10	Check Price
Best Anti Freezing Fuel Stabilizer	ISO-HEET Water Remover And Premium Fuel Line Antifreeze Quantity: 12 Fluid Ounce Fuel Treated Per Gallon: 1 Oz Per 1.6 Gallon Stabilizing Property: 1 Year	9.5	Check Price
Best Daily Use Fuel Stabilizer	STAR BRITE Star Tron Enzyme Fuel Treatment Quantity: 8 Fluid Ounce Fuel Treated: 1 Oz Per 6 Gallons Stabilizing Property: 2 Years	9.5	Check Price
Best Eco-Friendly Fuel Stabilizer	Royal Purple 11722 Max Quantity: 20 Fluid Ounce Fuel Treated Per Gallon: 1 Oz Per Gallon Stabilizing Property: Over Months	9.5	Check Price
Overall Best Fuel Stabilizer	Lucas LUC10013 Quantity: 128 Fluid Ounce Fuel Treated Per Gallon: 1 Oz Per 5 Gallon Stabilizing Property: 2 Years	9	Check Price
Best Fuel System Stabilizer	Chevron Techron Concentrate Plus Quantity: 20 Fluid Ounce Fuel Treated Per Gallon: 1 Oz Per Gallon Stabilizing Property: 1 Year	9	Check Price
Best Heavy Duty Extension Cord	STA-BIL 360 Marine Quantity: 32 Oz Fuel Treated Per Gallon: 1 Oz Per 10-Gallon Stabilizing Property: 1 Year	9	Check Price

In this article, we have selected the 10 best fuel stabilizers for generators for our today’s review. We will now go through an in-depth analysis and testing of their performance to see if they stand the manufacturer’s claim or not.

It will be helpful to opt for a powerful fuel stabilizer to keep your engine clean, prevent rust, and reduce fuel costs.

We know STA-BIL will be a good choice that’s already America’s top choice when required to store the generator to preserve leftover fuel. 

Features:

STA-BIL keeps the generator fuel fresh for two years; this is really good functionality for all gasoline generators, including ethanol-blended ones.

So if you want to store your generator, especially in winter when you require much less, you don’t need to drain the fuel; all you need is to add some stabilizer to keep gas fresh and clean over the years. 

The procedure to add the stabilizer is easy and simple. Just measure the desired quantity according to your fuel quantity and add it to keep the fuel fresh and avoid condensation over the storage period.

You can easily treat up to 80 gallons with STA-BIL and for 1 oz. i.e., 30ml of the stabilizer can treat up to 2.5gal gasoline. 

Let me give you a small tip; once you add the stabilizer to the fuel tank, operate the unit for almost five minutes so that you treat your whole generator engine before getting it stored.

A good fuel stabilizer offers a high shelf life, and you can carry its usage for years. For that purpose, STA-BIL comes with a shelf life of two years.

With amazing features, STA-BIL Storage Fuel Stabilizer also has limitations that may vary from user to user because some users find it a bit costly, and its measuring system is a bit hassle for some and easy for others. 

Verdict:

Have you noticed that over time if you keep gasoline generators undrained, the gasoline starts to break down and may affect your unit engine by the formation of rust and corrosion?

For that, LUCAS came into the market and made the user eliminate all the issues with its best fuel stabilizing capability for all kinds of gasoline engines.

Features:

Lucas fuel stabilizer maintains different units; for instance, you can use it in fuel pumps, injectors, compression rings, and fuel tanks.

Its long stabilizing capacity of 1 year (12 months) keeps all the parts and fuel fresh and lubricated. 

It comes in versatile quantity and size that depends upon your usage; for now, we rely on a single unit that contains one quart. 

For treating your gasoline generator, you are required to use one oz per gallon.

It requires a concentrated one, which I guess is a bit costly compared to other brands, but there is no need to worry; its action is long-lasting, and you will get rid of all the issues when your generator is stored.

Most of the users always ask what kind of engines Lucas fuel stabilizer suits. So despite your engine, whether a 02-stroke or a 04-strokes, it’s compatible with both.

You can easily use it to stop gasoline degradation and eliminate the need for fuel drainage before storing your generator. 

Lucas Oil 10303 stabilizer is also a good option for all kinds of engines, but it has a limitation of higher concentration requirement that makes it costly per usage. 

Verdict:

To maintain your generator or vehicle engine, enhance the fuel economy, keep the old gasoline fresh over years of storage and eliminate harmful emissions from your generator.

The Star Tron fuel stabilizer is the best like STA-BAL as it offers a two-year stabilizing capability making your units free from corrosion, rust, gum, and varnishes for the period of storage so the next time you opt for the engine, it will easily start without any hassle. 

Features:

Star Tron is manufactured by the various enzyme combination best suited for E-10 engines to deal with ethanol problems and enhance your engine mpg and HP.

In terms of concentration, you can easily opt for long-term usage, like you can use a single oz for 16 gallons that making a total of 256 gallons with a single Star Tron container. 

Remember that the first usage may require double the amount because it needs to stabilize the old gasoline that isn’t treated yet; once your unit is treated, then at the next stage, it will require a standard treatment to keep gasoline fresh for years. 

Star Tron Enzyme Fuel Stabilizer is among the best brand specifically designed for ethanol fuel, but it also has a limitation that may cost you; along with that, the container is not of that aesthetic design, and easy usage have some difficulty while pouring the right amount of the product.

As you know, this fuel is for gasoline and ethanol, so if you own a diesel generator, you can go for another few stabilizers that your diesel generator or engine uses. 

Verdict:

To get a combined stabilization and conditioning formula, the Yamaha brand is the one you should try out.

Its compatibility with E-10 gasoline engines and two-stroke and four-stroke engines it’s a better option to eliminate your engine from getting rust and eroding along with preventing them from phase separation problems to reduce them up to a minimum.

Features:

Yamaha is an alcohol-free fuel stabilizer and conditioner that comes in a single can of 32 oz, enough to stabilize the older gas in your fuel tank and keep it fresh over months.

The overall shelf life of the Yamaha stabilizer is two years, while its capability to keep gas fresh is limited to 6 months.

If you want to store your generator for a short period, you need to use 1oz per 3 gallons, but if the storage lasts for two months, then you need to use 01 oz per gallon to maintain the unit, and upon usage, it starts without hassle.

When you store your generator without a stabilizer and run it after a month, it will do cranks and chugging, making it difficult to start it at once.

Still, with the Yamaha fuel stabilizer, the engine remains lubricated, and fuel remains fresh to make the unit run in a single start-up.

Yamaha ACC-FSTAB-PL-32 is considered a good option for stabilizing your fuel and health in your engine life.

Still, the capacity it offers is less than other brands as others may offer up to years, unlike Yamaha, which provides just six months. But it can be a good option for those who want to store their units for the off-season. 

Verdict:

You might have observed that all the gasoline fuel stabilizers are not suitable for diesel engines, but it’s not the case with ISO-HEET.

It’s a premium fuel stabilizer with water removal and injector cleaning capability and keeps the gas and diesel fresh in the tank and engine. 

Features:

The ISO- HEET is not limited to gasoline but also can be opted for diesel engines and because of its versatility has made it is a good option and can be used to treat frozen gas tank parts.

You can opt-in for all kinds of machines, both 02-troke and 04- stroke, without any issues with removing water and keeping the engine free from rust and corrosion. 

Its use depends upon the weather; if you want to store it during winter, you need to use the stabilizer; a single bottle is used to treat up to 20 gallons of the fuel, but if you want to keep gas fresh in summer, you have to add the stabilizer after every 5000 miles for enhancing the injector cleaning and remove water that causes condensation in wet weather. 

You can easily use ISO-HEET Water Remover And Premium Fuel Line Antifreeze because of its easy-to-use 12-ounce bottle, and its anti-freezing action keeps your engine and tank fuel from getting frozen or dispersed.

The gas will remain fresh for a year without the formation of gum and varnishes.

What makes ISO-HEET unique from others is that it claims to absorb up to 5 times more than the standard regular gas line anti-freezers. 

Verdict:

Storing a generator in the off-season may require you to drain the fuel because leaving it may cause problems with the engine and the fuel tank.

Still, the Star Brite fuel treatment keeps the gas fresh without compromising on the generator engine during storage.

Features:

It eliminates the need for fuel which leads to zero wastage.

All you need is to add the formula to all your gasoline engines and generators that will free the machine from getting rest and eroded with the fuel and remain clean without the formation of gum and varnishes.

For treating your fuel, you may require desired concentration for desired gal. 6 Gal needs 01 oz of the Star Brite treatment. The formula is manufactured in an 8 oz bottle with which you can treat up to 64 gallons. 

Besides the use in storage conditions, Star Brite treatment also help the generator to be as efficient as it was before storage; when opting for storing your generator the next time you update it in the right season will make it start and run very quickly without the hassle by keeping high mpg and lower emissions. 

The treatment is formulated to provide fuel treatment for almost two years without any rust and corrosion in your generator, and I guess that’s the best part that we expect from a good fuel stabilizer.

With STAR BRITE Star Tron Enzyme Fuel Treatment, you clean your unit injector to keep them safe from getting varnishes and gum formations.

Whether you have a four-stroke engine or a two-stroke engine, it doesn’t matter; use this treatment to keep them long-lasting and effective and trust issues, but it does not come with a measuring unit to measure the desired quantity for adding in the tank. 

Verdict:

When the fuel in the tank gets old, it causes various harmful emissions from the engine operation, including nitrogen oxide, carbon monoxide, and hydrocarbons which you need to eliminate.

For that purpose, we suggest an eco-friendly CARB and EPA-compliant Royal purple Max fuel stabilizer that cleans your fuel system and prevents harmful emissions.

Features:

The product claims to be efficient in terms of increasing the fuel economy up to 3.2 % and HP to 2.6 % while reducing the emissions of about 12% for hydrocarbons, 18% for carbon monoxide, and 13% for nitrogen oxide.

There can be variations in the claimed percentages, but it is for sure that they help reduce emissions and enhance the above functionalities. 

Users have found it useful, and it is considered a worthy and eco-friendly option for your generator and vehicles and other small engines comprising gasoline and diesel engines.

To keep your fuel tank and fuel up to date, you need to add the whole bottle to a nearly empty tank and then go for refueling it. 

As the bottle city of 20 is used to treat 20 gallons, one oz will treat 1 gallon. If you had a two-stroke engine, 01 oz for 02 gallons, measure accordingly and add it to the fuel tank.

After adding, it goes deep into your fuel engine, injectors, carburetor, valves, and combustion chambers to lubricate it while enhancing fuel economy and fewer the chances of getting rust and corroded parts after off-season storage. 

The Royal Purple 11722 Max treatment is a good option for your vehicles and generator but shows versatility in having multiple limitations.

Some might find it useful at the start, and some might find it useful after numerous refills.  

Verdict:

The next on the list of best fuel stabilizer for generator include another LUCAS brand that is opted for treating fuel and keeping it fresh for years, but what makes it different from other LUCAS treatment is that it’s formulated with multiple additives that best suits both gasoline and diesel generators making it a versatile option for all your engines. 

Features:

Its formulation comprises a blend of oil slicks, additives, and a high amount of detergents to make the generator efficient and clean over storage.

Besides fuel stabilization, it also cleans the other parts, including the carburetor and injectors of the engine, to enhance the fuel economy and increase HP. 

Coming to its treatment capability, let me tell you that it shows that it can treat 400 Gal but let me correct you that for one oz, it treats up to 5 gallons, so the product comes with a 128 fluid oz capacity that will be able to treat almost 640 gallons higher than the claimed so what are you waiting go and grab yours to keep your engine free from rust corrosion and other deposits.  

For those curious about their engine’s safety, let me tell you that the Lucas LUC10013 product is free from harmful additives and alcohol and is safe to use while keeping the fuel fresh despite the engine you own.

Besides this, it also neutralizes the effects of ultra-low sulfur diesel fuel, enhancing safety. Lowering the concentration from 5 gallons to 3 or 4 can achieve the claimed 400 gallons per 128 oz capacity. 

Verdict:

You might come across various fuel stabilizers that clean up and preserve the gasoline in the fuel tank and engine, but what if you get a brand new stabilizer that is an overall package for the whole fuel system, including carburetors, combustion chamber, and fuel injectors? Wouldn’t that be amazing?

Yes, the chevron Techron concentrate fuel stabilizer is considered the best that comes with a 20 oz capacity for cleaning and maintaining 20 gallons of the tank. 

Features:

It is formulated using additives and scent-free ingredients and makes your power generator safe without causing rust and corrosion during storage.

Upon restoring your power, it will kick start with a single operation and enable you to run your generator back on time. After the off-season, when you update, it will not reduce the fuel economy and acceleration. 

Whether your unit has an older engine on a modern one, the stabilizer is compatible with both maximizes the fuel economy, and prevents carbon deposits on the machines.

If you opt for it for your vehicles, you need to add the desired amount once every 3000 miles are achieved, which will keep it clean and efficient working and run the car on fuel economy mode. 

Most people think it will maintain a worn-out fuel system part, but it’s not the case; Chevron Techron Concentrate Plus will only clean it or remove any deposits.

Some experienced bottle leaks when delivered, so before purchasing, contact the seller to send you the package in tight packaging. 

Verdict:

The last in the list of best fuel stabilizers for generators include STA-BIL 360 marine, which improves not only the off-season storage requirement but also enhances the in-season performance of your engine by preventing rust and corrosion along with removing carbon deposits, varnishes, and gum formation leading to keep the gas fresh over the years without any issues. 

Features:

STA-BIL 360 Marine fuel stabilizer is formulated with high-quality additives and comes in a 32 Oz bottle comprising blue color that can treat up to 320 gal gasoline.

It protects ethanol-blended fuel and eliminates the need for drainage while storing your generator for the off-season, making you worry-free.  

The product is best for the Marine harsh environment to keep the engine running efficiently and fuel fresh without discarding the old gas. You may have gone through other STA-BIL products.

But this one offers a treatment capability of one year, unlike the other that provides two years, but I guess it’s ok if the other features are compatible with your engine; you can opt for it.

Regarding stability and shelf life, the product lasts two years from the date you opt for it.

To use it, you need to open the cap; after that, you need to squeeze the bottle; once it is pressed, the small unit placed above the container that is calibrated will start to fill, and the product will run through it once you achieve desired quantity stop squeezing it and pour it into the generator fuel tank. 

Some users might find it a hassle to use it properly to measure the desired quantity for keeping your gas fresh over the year.

Verdict:

Buying Guide-Best Fuel Stabilizer For Generator

To make it easy for you, we developed an inclusive buying guide to help you select the best fuel stabilizer for the generator.

To opt for the one, you need to go through this buying guide to check various factors responsible for making the product the best concerning its features, treatment capability, size, and measurements required to treat gas.

What is keeping you waiting? Let’s get on board to select the best compatible formula for your generator and other operatable engines.

Stabilizing Property (Treatment Length):

The first factor you need to consider is the treating capability of the product to preserve gas over time. Various products are available that provide months of treatment while some for years. Suppose you want to store the engine for a short period.

In that case, you require a product that is capable of preserving your fuel for months, like six months or a season, while if you require the machinery to be kept safe for a year without compromising on the gas in your tank, you need to offer for a product that has a treatment time of 2 years.

We have mentioned the products whose time length ranges from 6 months to 2 years, and the Lucas LUC10013 is considered the best, with a treatment length of 2 years, making it easy for long-term storage.

Per Gal Requirements:

As you know, the product comes in a concentrated form that needs dilution according to the gallon you need to treat. Some products opt for 5 gallons; that is, 01 oz of formula will treat 5 gallons of gasoline.

All products are formulated with desired concentration ranges and the desired measurements to be used in the fuel tank.

The best formula on the list is Star Tron Enzyme Fuel Stabilizer, which can treat 16 gals for a single ounce for up to 2 years.

Quantity:

Each formulated stabilizer is added to a predefined size bottle with desired quantity keeping your fuel fresh for year’s products. Most listed products came in 32, 8, 20, and 128 fluid ounces.

The amounts above or below 20 need to be diluted according to the gallons required for treating but not with the case of 20 fluid oz. Use the whole bottle in a 20-gallon tank without any measurements or calculations.

Fuel Type:

We have different kinds of fuel that the generator opts for its running, including;

• Gasoline-powered 
• Ethanol blended fuels 
• Diesel-powered 

The best-used stabilizer suits gasoline and diesel engines Lucas LUC10013 with dual fuel compatibility features. The fuel stabilizers are formulated while keeping the type of fuel it needs to treat.

Some fuel stabilizers may only be compatible with gasoline or blended ethanol fuels, while others are compatible with gas and diesel engines.

Those only compatible with gasoline are not used for diesel engines, so if you own a diesel generator, you must check the specifications that contain uses for gasoline and diesel everyday usage and off-season treatment.

Easy To Use:

Before purchasing the best fuel stabilizer, check for its use because some might be a hassle and require a proper method to pour it into the generator.

Some are easy to use; you must take the bottle and pour it into the generator tank to preserve the fuel.

After the off-season generator starts within seconds, some may require proper measurements and calibrations for the desired dilution for treating the gas.

Shelf Life:

You not only require an efficient and high-performance product that keeps your fuel preserved for years, but you also require a product with a long shelf life to use for years for the desired purpose. We suggest using the STA-BIL Storage Fuel Stabilizer.

That stabilizes by aiming for a shelf life of 2 years from the date you opted for your generator, vehicle, or other engines.

Engine Type:

Fuel stabilizers have made it easy for all engines, including four-stroke and two-stroke.

The only difference and point of concern you need to check is how much dilution will require both the four-stroke strokes may require different dilution compared to 2 strokes.

Additional Features:

Prevent Gum, Varnishes, and Carbon Deposits:

Besides the important factors, there are other important features that you should know before purchasing the best fuel stabilizer for a generator; once you select a product that has the desired concentration, treatment time, and ease of use, then you need to check that whether the product can lubricate your machinery or not?

Is the product worth it for removing deposits, varnishes, gum formation, or any other issues related to overtime storage of gasoline in the tank? 

Water Removal:

The best products are quality: they prevent water absorption in the fuel tank from rust and corrosion.

So we suggest a product containing this property to avoid rusting engine and fuel system parts. 

Full Fuel System Cleaning and Lubrication:

Despite preserving fuel, your product must be able to clean fuel system parts like the carburetor, combustion chamber, and valves. They must also be able to get benefited from the stabilizer.

This feature may or may not be available with the various brand, but to select the best, you need to check these features to count on the maximum of them in your product before choosing them.

The higher the feature number and the better the compatibility, the more worth the product to purchase!

Budget And Cost:

After discussing all the features and prime factors to be considered before purchasing, we hope you may have the best product in your mind that needs to be clarified for making the final purchase.

Different stabilizing formulas come with different costing ranges from low to high, and price depends upon the features they are rated with, procedure, and purpose for a specific fuel type.

The cost may vary for a low and high-quantity fuel stabilizer. We suggest going for the one that best suits your generator and doesn’t get tricked by the low-quality stabilizer because it will be just a waste of money.

The expensive ones include STA-BIL Storage Fuel Stabilizer.

FAQs (Frequently Asked Questions)

What Kind Of Fuel Stabilizer Do You Use For A Generator?

You can use gasoline and diesel-compatible fuel stabilizers depending on the generator type. The best fuel stabilizer is compatible with all engines and fuel types.

If you own gasoline, go for the formula that is gasoline specific in treating your gas and preserving the fuel over the off-season. 

Do I Need A Fuel Stabilizer In My Generator?

You require a fuel stabilizer for your generator to preserve the fuel rather than draining it before storage or overtime usage.

The fuel stabilizer will enhance the engine life, clean and ensure a water-free gas tank, reduce deposits, gums, and varnishes, increase fuel economy, reduce maintenance costs, and prevent fuel waste. 

When Should I Add A Fuel Stabilizer To My Generator?

If you want to keep your generator stored for off-season so, before storing, add the desired amount of fuel stabilizer depending on the fuel quantity in your tank, but for running, units add after a specified run time and then refuel to the max so that the older gas gets stabilized with the new without messing with the engine.

Can I Add A Fuel Stabilizer For The Generator?

Yes, you can add a fuel stabilizer for the generator because it eliminates the wastage and need for draining the old fuel rather than keeping your gas fresh over months and years of storage. 

Can You Put Too Much Fuel Stabilizer In Gas?

You can put too much stabilizer, but the results aren’t noticeable. If you accidentally add too much, then there is no need to worry about that. It will all go to waste.

The measurement is carried out because a specific gallon requires a particular amount; higher than that won’t be effective; rather, you will waste your money and the product. 

Conclusion:

See More:

Best 3000/3500 Watt Inverter Generators
Best 8000/8500 Watt Generator

Video Help:

If you want to know more then watch this video.