Most Craftsman lawn mowers use regular unleaded gasoline with an octane rating of 87 or higher and no more than 10% ethanol (E10). Avoid gasoline containing more than 10% ethanol unless your specific Craftsman model manual approves it.
Across the United States, homeowners commonly use Craftsman gas-powered lawn mowers to maintain residential yards through spring, summer, and fall. Choosing the correct fuel helps protect the small engine, improve starting reliability, and reduce problems caused by stale or contaminated gasoline.
The exact fuel recommendation can vary by Craftsman mower model and engine manufacturer, so the owner’s manual remains the final authority. However, most modern Craftsman lawn mowers are designed to run on fresh unleaded gasoline with an octane rating of at least 87 and limited ethanol content.
What Type of Gas Does a Craftsman Lawn Mower Take?
Most Craftsman lawn mowers take regular unleaded gasoline, similar to the fuel sold at many U.S. gas stations for cars. A gasoline grade with 87 octane is generally suitable for many Craftsman push mowers, self-propelled mowers, and riding mowers when approved by the engine manufacturer.
Gasoline should be clean, fresh, and properly stored. Using the correct fuel does not only affect power output; it also helps prevent carburetor deposits, difficult starting, and fuel system problems.
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Recommended gasoline type
Use fresh unleaded gasoline that meets the octane requirements listed in your Craftsman mower manual.
Common ethanol limit
Many small engines are designed for gasoline containing up to 10% ethanol, commonly called E10.
Fuel to avoid
Avoid diesel fuel, gasoline mixed with oil unless the engine specifically requires it, and high-ethanol blends such as E15 or E85.
Why Ethanol Content Matters in Craftsman Mowers
Ethanol attracts moisture and can contribute to fuel system corrosion or performance issues when gasoline sits unused for long periods. Small engines used seasonally, such as lawn mower engines, are especially vulnerable when fuel is stored improperly.
E10 gasoline
Gasoline containing up to 10% ethanol is commonly available and accepted by many small engines.
Ethanol-free gasoline
Ethanol-free fuel may help with long-term storage situations, but users should follow their mower manufacturer’s recommendations.
How to Choose the Right Gas for Your Craftsman Lawn Mower
Selecting mower fuel is usually simple, but several factors can affect the best choice. The engine model, storage period, local fuel availability, and mower usage schedule all influence fuel decisions.
The safest approach is to check the fuel section of the Craftsman owner‘s manual or the engine manufacturer’s instructions before changing fuel types.
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Check the octane rating
Use gasoline with the minimum octane rating specified for your mower engine.
Buy fresh fuel
Avoid using gasoline that has been sitting for extended periods without proper stabilization.
Consider storage needs
If the mower will sit unused for months, follow proper fuel storage procedures recommended for small engines.
Premium gasoline is not automatically better for a Craftsman lawn mower. Higher octane fuel is designed for engines that require resistance to knocking, and many mower engines do not benefit from premium fuel if regular unleaded already meets specifications.
Regular unleaded
Usually the practical choice when it meets the engine’s required octane rating.
Premium fuel
Only use it when recommended by the manufacturer or when it provides a specific benefit for the engine design.
Common Fuel Mistakes That Can Damage a Craftsman Lawn Mower
Many lawn mower fuel problems come from using the wrong gasoline, storing fuel incorrectly, or leaving old fuel inside the tank for too long. Understanding these mistakes can prevent unnecessary repairs.
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Using old gasoline
Gasoline can degrade over time, causing hard starts, rough running, or engine hesitation.
Using high ethanol fuel
Fuel blends with excessive ethanol may not be suitable for many small engines.
Mixing oil incorrectly
Most Craftsman four-cycle mower engines use gasoline only, while certain two-cycle engines require a gasoline-oil mixture.
Signs Your Craftsman Mower May Have a Fuel Problem
Fuel-related problems often appear as starting issues or inconsistent engine operation. Checking fuel quality is one of the simplest troubleshooting steps before inspecting more complex engine components.
Hard starting
Old or contaminated fuel may prevent the engine from starting normally.
Engine sputtering
Restricted fuel flow or poor-quality gasoline can cause uneven operation.
Loss of power
Fuel system issues may reduce engine performance during mowing.
How to Store Gas for a Craftsman Lawn Mower
Proper fuel storage helps maintain engine reliability, especially for homeowners who stop mowing during winter or long dry periods. Gasoline should be stored safely in an approved container and handled according to local safety rules.
Before long-term storage, follow the instructions in your Craftsman manual. Some manufacturers recommend draining fuel, while others recommend using fuel stabilizer and storing the mower according to engine guidelines.
Contaminated containers can introduce dirt or moisture into the mower fuel system.
Avoid long storage periods with untreated fuel
Fuel stabilizer may help preserve gasoline quality when used according to instructions.
Store safely
Keep gasoline away from heat sources, flames, and areas where fuel vapors could create hazards.
Should You Use Ethanol-Free Gas in a Craftsman Mower?
Ethanol-free gasoline can be useful for some small-engine applications, particularly when equipment is stored for longer periods. However, it is not required for every Craftsman mower. The best choice depends on the engine specifications and the manufacturer’s guidance.
Potential advantage
It may reduce ethanol-related storage concerns in some situations.
Important limitation
It may cost more or be less available depending on location.
Frequently Asked Questions
Q
Can I use regular 87 octane gas in a Craftsman lawn mower?
Yes, many Craftsman lawn mowers are designed to operate on regular unleaded gasoline with 87 octane or higher. Always verify the requirement for your specific mower model.
Q
Can I put premium gas in my Craftsman lawn mower?
Premium gasoline usually will not harm a mower if it meets the engine requirements, but it is not always necessary. A higher octane rating does not automatically improve performance in engines designed for regular fuel.
Q
Is E10 gas safe for Craftsman lawn mowers?
Many modern small engines can use E10 gasoline, which contains up to 10% ethanol. Check your owner’s manual to confirm compatibility for your specific Craftsman mower.
Q
What happens if I use old gas in my Craftsman mower?
Old gasoline can cause difficult starting, poor engine performance, and fuel system problems. Removing stale fuel and replacing it with fresh gasoline may help restore normal operation.
Q
Do Craftsman lawn mowers use mixed gas and oil?
Most Craftsman four-cycle lawn mowers use gasoline only. Some two-cycle engines require a gasoline and oil mixture, so check the engine instructions before adding oil to fuel.
✦ Wrapping Up
Conclusion
The correct type of gas for a Craftsman lawn mower is usually fresh regular unleaded gasoline with at least 87 octane and limited ethanol content. Using the recommended fuel and storing it properly can help maintain reliable engine operation.
Because Craftsman has produced many mower models with different engines, always confirm the exact fuel requirements in your owner’s manual before changing gasoline types or storage practices.
💡 Key Takeaway
Use fresh, clean unleaded gasoline that matches your Craftsman mower’s manual specifications, avoid unsuitable ethanol blends, and maintain proper fuel storage habits.
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