A lawn mower needs the right type of gas to work well. Generally, most lawn mowers use regular unleaded gasoline.
But, there are some details to keep in mind. Using the right gas ensures your lawn mower runs smoothly. Regular unleaded gasoline, with an octane rating of 87 or higher, is usually the best choice. Some newer models might need fuel with no ethanol or a mix of gas and oil.
The type of gas you use can affect your mower’s performance and lifespan. Over time, using the wrong gas can damage the engine. It’s important to know what your mower needs to keep it in good shape. This guide will help you choose the right fuel for your lawn mower and keep it running efficiently.
Types Of Lawn Mower Engines
When choosing the right gas for your lawn mower, understanding the types of engines is crucial. Lawn mowers generally come with either two-stroke or four-stroke engines. Each type has different fuel requirements and maintenance needs.
Two-stroke Engines
Two-stroke engines are lightweight and powerful. They use a mix of gasoline and oil. This mixture lubricates the engine as it runs. Two-stroke engines are common in smaller, handheld lawn mowers. They require less maintenance but can be noisier.
Four-stroke Engines
Four-stroke engines are more fuel-efficient and run quieter. They use gasoline only, with oil in a separate compartment. This type of engine is found in most walk-behind and riding lawn mowers. Four-stroke engines need regular oil changes but offer a smoother performance.

Recommended Gasoline Types
Choosing the right gasoline for your lawn mower is essential. It ensures your machine runs efficiently and lasts longer. In this section, we’ll cover the two most recommended gasoline types for lawn mowers: regular unleaded gasoline and ethanol-free gasoline.
Regular Unleaded Gasoline
Most lawn mowers can run on regular unleaded gasoline. This type of gasoline is widely available and generally inexpensive. It usually has an octane rating of 87, which is suitable for most small engines. However, make sure to avoid gasoline with more than 10% ethanol.
- Octane rating of 87
- Widely available
- Inexpensive
Ethanol-free Gasoline
Ethanol-free gasoline is another excellent option for lawn mowers. Ethanol can attract moisture, which may cause engine problems over time. Using ethanol-free gasoline reduces the risk of corrosion and extends the life of your engine.
- Does not attract moisture
- Reduces risk of corrosion
- Extends engine life
Gasoline Type | Benefits | Considerations |
---|---|---|
Regular Unleaded Gasoline | Widely available, inexpensive | Avoid high ethanol content |
Ethanol-Free Gasoline | Reduces corrosion, extends engine life | May be less available |
Impact Of Ethanol On Lawn Mowers
Ethanol in gasoline can affect your lawn mower’s performance. Many fuels contain ethanol, which is a type of alcohol. This component can lead to various issues if not managed well. Understanding the impact of ethanol is vital for maintaining your mower.
Ethanol Blends
Most gasoline sold today has some ethanol. Common blends include E10, which contains 10% ethanol. Some areas might offer E15 or higher blends. These higher ethanol contents can create more problems for small engines. Your lawn mower might not run as smoothly with these blends.
Potential Damage
Ethanol can attract moisture. This moisture can cause corrosion in your fuel system. Over time, this leads to rust and other damage. Ethanol can also break down rubber and plastic parts. This can cause leaks and other issues.
Using ethanol-blended fuel can also reduce engine efficiency. Your lawn mower might consume more fuel than usual. This means more trips to refuel, which can be a hassle. It’s important to choose the right fuel to keep your mower running well.
Fuel Additives And Stabilizers
Fuel additives and stabilizers play a crucial role in maintaining the performance of your lawn mower. Over time, gasoline can degrade, causing problems like starting issues and engine damage. Using additives and stabilizers can help prevent these issues and keep your lawn mower running smoothly.
Benefits Of Additives
Fuel additives offer several benefits to your lawn mower:
- Improves fuel efficiency: Additives help your engine run more smoothly.
- Prevents corrosion: They protect metal parts from rust.
- Reduces emissions: Cleaner fuel means fewer pollutants.
Using additives can extend the life of your lawn mower. They help keep the engine clean and efficient.
How To Use Stabilizers
Using stabilizers is easy. Just follow these steps:
- Add the stabilizer to your fuel tank before filling it with gasoline.
- Use the recommended amount as per the product instructions.
- Run the engine for a few minutes to mix the stabilizer with the gasoline.
Stabilizers help keep your fuel fresh. They prevent it from breaking down over time. This is especially useful if you store your lawn mower for long periods.
Consider using a stabilizer during the winter months. It ensures the mower starts easily in the spring.
Feature | Benefit |
---|---|
Improves fuel efficiency | Better engine performance |
Prevents corrosion | Longer engine life |
Reduces emissions | Cleaner air |
Keeps fuel fresh | Reliable starts |
Incorporate fuel additives and stabilizers into your lawn mower maintenance routine. It can save you time and money in the long run.
Proper Fuel Storage
Properly storing fuel for your lawn mower ensures its performance and longevity. Correct storage can prevent fuel degradation and keep your equipment running smoothly. Let’s dive into the essentials of proper fuel storage.
Storage Containers
Choosing the right storage container is crucial. Use a container made of approved materials, like metal or plastic. Ensure it is designed to store fuel. This helps prevent leaks and contamination.
- Use approved containers with tight seals.
- Store in a cool, dry place away from direct sunlight.
- Keep containers out of reach of children.
Shelf Life Of Gasoline
Gasoline has a limited shelf life. Over time, it degrades and loses effectiveness. Typically, gasoline lasts about three to six months.
Here is a quick guide on gasoline shelf life:
Type of Gasoline | Typical Shelf Life |
---|---|
Regular Gasoline | 3-6 months |
Stabilized Gasoline | 1-3 years |
Using stabilizers can extend the shelf life of gasoline. Follow the manufacturer’s instructions for best results.
Signs Of Fuel Problems
Understanding the signs of fuel problems in your lawn mower is crucial. The right fuel keeps your mower running smoothly. Incorrect fuel can lead to issues. Two common signs are engine performance problems and starting difficulties.
Engine Performance Issues
Does your lawn mower’s engine run rough? This can indicate a fuel issue. Poor quality gas can cause this problem. Your engine might sputter or misfire. It can also lose power while mowing. You might notice black smoke. This can signal unburned fuel in the exhaust.
Starting Problems
Struggling to start your lawn mower? This is a common sign of fuel trouble. Stale or contaminated gas can cause this. Fresh gas is essential for smooth starts. Your mower might crank but fail to start. Or it starts but stalls soon after. Regularly checking and replacing fuel can help. Clean fuel filters and lines are also important.
Maintenance Tips
Proper maintenance of your lawn mower ensures its longevity and efficiency. Regular upkeep keeps your mower running smoothly. Below are some essential tips to help you maintain your lawn mower effectively.
Regular Fuel System Checks
Regularly check the fuel system to prevent issues. Start by inspecting the fuel lines for cracks or leaks. Replace damaged lines promptly to avoid fuel leaks. Ensure the fuel cap is secure to prevent contamination.
Use fresh gasoline. Old fuel can clog the fuel system, causing poor performance. Store gasoline in a clean, sealed container. Label it with the purchase date to track its age.
Consider using a fuel stabilizer. It helps keep the gasoline fresh longer. This is especially useful if you don’t use the mower often.
Cleaning The Carburetor
The carburetor mixes fuel with air for combustion. A dirty carburetor can cause starting problems and poor performance.
First, locate the carburetor on your lawn mower. Consult the user manual for its exact location. Turn off the fuel valve and remove the air filter. This provides access to the carburetor.
Use a carburetor cleaner spray to clean the carburetor. Spray it into the carburetor to remove dirt and deposits. Allow the cleaner to dry before reassembling the parts.
If the carburetor is very dirty, consider removing it for a thorough cleaning. Soak it in a carburetor cleaning solution. Use a brush to scrub off stubborn dirt.
Reassemble the carburetor and air filter. Make sure all parts are securely in place.
Maintenance Task | Frequency |
---|---|
Check Fuel System | Monthly |
Clean Carburetor | Every 3 Months |
Following these maintenance tips helps keep your lawn mower in top condition. Regular checks and cleaning ensure efficient performance and extend the mower’s lifespan.

Frequently Asked Questions
What Type Of Gas For Lawn Mower?
Use unleaded gasoline with an octane rating of 87 or higher. Avoid ethanol blends over 10%.
Can I Use Regular Gas In My Lawn Mower?
Yes, regular unleaded gasoline with an octane rating of 87 is suitable for most lawn mowers.
Is Ethanol-free Gas Better For Lawn Mowers?
Ethanol-free gas can reduce engine deposits and prevent fuel system damage. It’s a good choice for lawn mowers.
How Long Can Gas Sit In A Lawn Mower?
Gasoline can degrade after 30 days. Use a fuel stabilizer to extend its life up to 12 months.
Conclusion
Choosing the right gas for your lawn mower is crucial. It ensures smooth operation and extends the mower’s life. Always use fresh, clean fuel. Check the mower’s manual for specific fuel recommendations. Avoid ethanol-blended fuels if possible. Regular maintenance and proper storage of fuel also help.
Following these guidelines keeps your lawn mower running efficiently. Enjoy a well-manicured lawn with minimal effort. Remember, the right gas makes a big difference. Keep your mower in top shape with the correct fuel. Happy mowing!