The warm weather is finally here, and it’s time to get your lawn mower out of storage. But before you fire it up, you might be wondering: what kind of gas should I be using? You might have heard whispers about different gas grades, additives, and even the potential for damaging your engine. This article will guide you through the intricacies of choosing the right fuel for your lawn mower, so you can get your lawn looking pristine and avoid any unnecessary repairs.
In a nutshell, the answer is simple: regular unleaded gasoline is the best choice for most lawn mowers. However, there are a few important factors to consider, including your mower’s age, engine type, and the type of gas available in your area.
Understanding Gasoline Grades
Gasoline is graded based on its octane rating, which is a measure of its resistance to knocking or pinging during combustion. Higher octane fuel is designed for high-performance engines that operate under high compression and high temperatures. Here’s a breakdown of the common grades:
Regular Unleaded (87 Octane)
- Most common and affordable option.
- Suitable for most lawn mowers, especially older models and those with smaller engines.
Mid-Grade Unleaded (89 Octane)
- Offers slightly better performance and knock resistance.
- May be necessary for some newer lawn mowers with larger engines.
Premium Unleaded (91+ Octane)
- Designed for high-performance engines, often found in cars and some high-end power equipment.
- Generally not necessary for standard lawn mowers. Using premium gas in a mower designed for regular gas will not improve performance and could even waste money.
Why Unleaded?
Using leaded gasoline in a lawn mower is strongly discouraged. Lead can build up in the engine over time, leading to:
- Spark plug fouling: Lead deposits can interfere with the spark plug’s ability to ignite the fuel mixture.
- Engine damage: Lead can cause wear and tear on moving parts, reducing engine efficiency and lifespan.
- Environmental concerns: Lead is a harmful pollutant that can damage the environment and human health.
Fuel Additives: Are They Worth It?
Fuel additives can be a bit of a minefield. While some claim to improve fuel efficiency, reduce emissions, and clean the engine, many are simply gimmicks.
Ethanol
Ethanol is a common fuel additive that is blended into gasoline to reduce dependence on fossil fuels. However, it can have negative effects on lawn mower engines:
- Corrosion: Ethanol can attract moisture, which can lead to corrosion in the fuel system.
- Fuel line issues: Ethanol can degrade fuel lines and other components over time, causing leaks and performance problems.
- Phase separation: Ethanol can separate from gasoline, leaving a gummy residue in the fuel tank and lines.
If you live in an area with high ethanol content (10% or more), consider using fuel stabilizers to minimize its negative effects.
Fuel Stabilizers
Fuel stabilizers are designed to prevent fuel from degrading and becoming stale over time. They are particularly useful for storing lawn mowers during the off-season.
Recommended for:
- Long-term storage: If you plan to store your lawn mower for several months, using a fuel stabilizer is highly recommended.
- Areas with high ethanol content: Stabilizers can help protect your fuel system from the corrosive effects of ethanol.
Finding the Right Gas for Your Lawn Mower
Here’s a simple guide to choosing the right gasoline for your lawn mower:
- Check your owner’s manual: Your manual will specify the recommended fuel type and octane rating for your mower.
- Age and engine type: Older mowers with smaller engines typically run well on regular unleaded gasoline. Newer models with larger engines might require mid-grade.
- Ethanol content: If you live in an area with high ethanol content, consider using fuel stabilizers or finding a gas station with lower ethanol blends.
Storing Gasoline: Best Practices
Proper storage is crucial for maximizing the lifespan of your gasoline and preventing engine problems.
Fuel Storage Tips
- Use a clean container: Store gasoline in a clean, airtight container specifically designed for fuel.
- Label the container: Clearly label the container with the date and type of fuel.
- Store in a cool, dry place: Avoid storing gasoline in direct sunlight or extreme temperatures.
- Avoid long-term storage: If you must store gasoline for an extended period, add a fuel stabilizer to prevent degradation.
- Dispose of old gas properly: Never pour old gasoline down the drain or into the ground. Contact your local waste management facility for proper disposal methods.
Troubleshooting Fuel-Related Issues
If you’re experiencing problems with your lawn mower that could be related to fuel, here are some common issues to consider:
Engine won’t start:
- Empty fuel tank: The most obvious issue! Check the fuel level and refill if necessary.
- Stale fuel: Old fuel can clog the fuel lines and carburetor. Try using fresh gas or adding a fuel stabilizer.
- Spark plug issues: A fouled spark plug can prevent the engine from igniting the fuel. Check the spark plug and replace it if necessary.
Engine runs poorly or stalls:
- Clogged fuel filter: A dirty fuel filter can restrict fuel flow to the engine. Replace the filter if it appears dirty or clogged.
- Carburetor problems: A dirty carburetor can affect the fuel-air mixture, leading to performance issues. Consider cleaning or rebuilding the carburetor if necessary.
Conclusion
Choosing the right gas for your lawn mower is essential for maintaining its performance and longevity. While regular unleaded gasoline is generally the best option, it’s important to check your owner’s manual for specific recommendations. By following the tips outlined in this article, you can ensure that your lawn mower runs smoothly and efficiently, allowing you to enjoy a lush, green lawn all season long.
FAQs
What type of gas should I use in my lawn mower?
The type of gas you should use in your lawn mower will depend on the specific model and its requirements. Most modern lawn mowers are designed to run on regular unleaded gasoline, which is typically 87 octane. Check your owner’s manual for specific recommendations. It is important to note that using a higher octane fuel than recommended will not improve performance and may even cause problems.
Can I use gasoline with ethanol in my lawn mower?
While most modern lawn mowers can handle gasoline with a small amount of ethanol (typically up to 10%), it’s best to avoid it if possible. Ethanol can attract moisture and can cause problems like fuel line clogging and engine corrosion over time. If you are concerned about using gasoline with ethanol, you can purchase ethanol-free gasoline at some gas stations.
Can I use diesel fuel in my lawn mower?
No, you should never use diesel fuel in a gasoline-powered lawn mower. Diesel engines are designed to run on diesel fuel, which has a different chemical composition than gasoline. Using diesel fuel in a gasoline engine will damage the engine and can cause a fire.
What is the best way to store gasoline for my lawn mower?
If you are storing gasoline for your lawn mower, it is important to use a gas stabilizer to prevent the fuel from degrading. Store the gas in a tightly sealed container in a cool, dry place. It’s also recommended to drain the gas tank and carburetor at the end of the season to prevent fuel from going bad.
How often should I change the gasoline in my lawn mower?
It’s generally a good idea to change the gas in your lawn mower every 30 days, even if you haven’t used it. Gasoline can deteriorate over time, even if it is stored properly. If you are storing your lawn mower for an extended period, it is best to drain the gas tank completely.
Can I use a fuel additive in my lawn mower?
Using a fuel additive in your lawn mower can be beneficial if you are using gasoline with a high ethanol content or if you are storing your lawn mower for an extended period. However, it is important to choose a fuel additive that is specifically designed for small engines. Always follow the manufacturer’s instructions when using a fuel additive.
Why does my lawn mower run poorly after using old gas?
If you have been using old gasoline in your lawn mower, it is likely that the fuel has deteriorated and is no longer providing the proper combustion. This can lead to a number of problems, including poor performance, hard starting, and engine stalling. To prevent this, always use fresh gasoline and store your gasoline properly.