The warm summer sun is shining, and your lush green lawn is beckoning you to enjoy the outdoors. But before you fire up your trusty riding lawn mower, you might be wondering: what type of gas should you be putting in it? Choosing the right fuel for your mower is crucial for its performance, longevity, and even your own safety. This guide will delve into the intricacies of gasoline for riding lawn mowers, exploring different fuel types, additives, and best practices for ensuring your mower runs smoothly and reliably season after season.
The Short Answer: Unleaded Gasoline
The simple answer is: use unleaded gasoline in your riding lawn mower. However, there are nuances within this category that can significantly impact your mower’s performance and lifespan. We’ll break down the various types of unleaded gasoline and explain why some are better suited for your needs than others.
Unraveling the Fuel Options: Unleaded 87, 89, and 91 Octane
The most common gasoline grades available are 87, 89, and 91 octane. These numbers indicate the fuel’s resistance to knocking, which is a premature combustion that can damage your engine. While any of these grades could work in your mower, understanding their differences is key:
87 Octane: The Most Common Choice
- Pros: Generally the most affordable option, widely available.
- Cons: May not provide optimal performance in high-performance engines or under heavy loads.
- Suitable for: Most riding mowers with standard engines that don’t require high-octane fuel.
89 Octane: A Middle Ground
- Pros: Offers a balance between affordability and performance.
- Cons: Might be slightly more expensive than 87 octane.
- Suitable for: Mowers with larger engines or those that experience frequent heavy use.
91 Octane: High Performance
- Pros: Provides the best protection against knocking, ensuring smooth operation.
- Cons: Typically the most expensive option, may not be necessary for all mowers.
- Suitable for: High-performance engines, mowers operating in extreme conditions, or situations demanding maximum power.
The Importance of Fuel Stability: Avoiding Stale Gas
Gasoline is a highly volatile substance that degrades over time. When gasoline sits in your mower’s tank for prolonged periods, it can lose its volatility and begin to form deposits and gums. This can lead to:
- Engine trouble: The build-up of deposits can clog fuel lines and injectors, preventing proper fuel flow and causing engine misfires.
- Hard starting: Stale gas can make it difficult to start your mower.
- Reduced performance: The decreased volatility can result in a loss of power and efficiency.
To prevent these issues:
- Use fuel stabilizers: Adding a fuel stabilizer to your gas tank helps prevent the formation of gums and deposits, extending the shelf life of the fuel.
- Store fuel properly: Store gasoline in airtight containers in a cool, dry place.
- Avoid prolonged storage: If possible, drain your mower’s tank before storing it for an extended period.
Additives: Friend or Foe?
The market is flooded with various gas additives that promise to enhance engine performance and prevent problems. While some additives can be beneficial, it’s crucial to approach them with caution:
Helpful Additives:
- Fuel stabilizers: As mentioned earlier, these are essential for preserving fuel quality and preventing degradation.
- Octane boosters: Can be helpful for engines that require higher octane fuel but are running on lower-octane gas.
Potentially Harmful Additives:
- Engine cleaners: While they claim to clean engine components, they can sometimes cause more harm than good. They may contain harsh chemicals that can damage engine parts.
- Lubricating additives: Most modern gasoline engines don’t need these. They can actually increase the risk of spark plug fouling and engine problems.
Important Tip: Always consult your mower’s owner’s manual for specific recommendations on fuel and additives. Using the wrong additives can void your warranty and cause damage to your engine.
Fueling Up Your Riding Lawn Mower: Best Practices
1. Choosing the Right Fuel
- Read your owner’s manual: Your mower’s manual will specify the recommended fuel type and octane rating.
- Use fresh fuel: Always use fresh gasoline. Avoid using gas that has been sitting for more than 30 days.
- Don’t top off the tank: Overfilling the tank can lead to fuel spills and potential damage to the mower.
2. Storing Your Mower
- Drain the tank: Empty your mower’s gas tank before storing it for long periods.
- Add a fuel stabilizer: If you cannot drain the tank completely, add a fuel stabilizer to prevent gas degradation.
3. Regular Maintenance
- Clean the fuel lines and filter: Regularly check and clean your mower’s fuel lines and filter to prevent clogs and ensure optimal fuel flow.
- Service the carburetor: Schedule regular carburetor servicing to keep it in good working condition.
Final Thoughts: The Power of Proper Fuel
Choosing the right type of gas for your riding lawn mower is an essential aspect of keeping your machine running smoothly and efficiently. By understanding the nuances of fuel types, recognizing the importance of fuel stability, and following best practices for fueling and maintenance, you can ensure your mower provides reliable performance for years to come.
Remember, consult your mower’s owner’s manual for specific recommendations and avoid using unnecessary additives that could potentially harm your engine. With the right fuel and proper care, you’ll be able to enjoy a beautiful, healthy lawn and countless hours of outdoor bliss.
FAQs
What type of gas should I use in my riding lawnmower?
The type of gasoline you use in your riding lawnmower is important for its performance and longevity. Most manufacturers recommend using regular unleaded gasoline with an octane rating of 87 or higher. Avoid using gasoline with ethanol, as it can damage the engine and fuel system. You should also always use fresh gasoline, as old gasoline can gum up the engine and cause problems.
How often should I change the gas in my riding lawnmower?
It is best to change the gas in your riding lawnmower every 30 days, or sooner if you notice any signs of deterioration. Old gasoline can lose its volatility, making it difficult to ignite and causing problems with your engine. You should also drain the gas tank before storing your mower for the winter.
Can I use ethanol-free gasoline in my riding lawnmower?
Using ethanol-free gasoline in your riding lawnmower is generally a good idea. Ethanol can attract moisture, which can lead to corrosion and other problems in your engine and fuel system. Ethanol-free gasoline is also more stable and less likely to deteriorate over time.
What is the difference between regular and premium gasoline?
Regular gasoline has a lower octane rating than premium gasoline, which means it is less resistant to knocking or pinging. Most riding lawnmowers do not require premium gasoline and will perform fine with regular unleaded. However, if you are experiencing knocking or pinging, you may want to try using premium gasoline.
Can I use diesel fuel in my riding lawnmower?
No, you should never use diesel fuel in a riding lawnmower. Diesel engines are designed to burn diesel fuel, which has a different chemical composition than gasoline. Using diesel fuel in a gasoline engine can cause serious damage and is not recommended.
What are the signs of bad gas in my riding lawnmower?
Bad gas can cause a variety of problems in your riding lawnmower, including difficulty starting, rough running, and reduced power. You may also notice a decrease in fuel efficiency or a change in the color or smell of the gasoline. If you suspect that you have bad gas in your mower, it is best to drain the tank and replace it with fresh gasoline.
What should I do if I accidentally put the wrong type of gas in my riding lawnmower?
If you accidentally put the wrong type of gas in your riding lawnmower, do not start the engine. Immediately drain the tank and refill it with the correct type of gasoline. You may also want to run the engine for a few minutes to clear any remaining fuel from the system. If you are unsure how to do this, it is best to consult your owner’s manual or a qualified mechanic.