The warm weather has arrived, and you’re ready to tackle your lawn. You pull out your trusty lawn mower, give it a few pulls, and… nothing. Frustration sets in as you realize your lawn mower won’t start. Is it the fuel? You haven’t used it in a while, and you suspect old gas might be the culprit. But is old gas really the culprit? In this article, we’ll explore the potential problems old gas can cause, the signs to look for, and what you can do to get your lawn mower running smoothly again.
The short answer is yes, old gas can definitely be a major culprit in a lawn mower’s failure to start. Over time, gasoline deteriorates, losing its volatility and ability to combust efficiently. This deterioration can lead to a range of issues, from difficulty starting to complete engine failure.
Understanding the Impact of Old Gas on Your Lawn Mower
Gasoline is a complex blend of hydrocarbons, and when exposed to air and sunlight, it begins to break down. This process, known as oxidation, creates gums, varnishes, and other deposits that can clog fuel lines, carburetor jets, and even fuel filters.
How Old is Too Old?
While gasoline can technically last for years in sealed containers, its quality deteriorates significantly after just a few months. Here’s a general guideline:
- 3 months: You might start to notice some performance issues, such as difficulty starting or a loss of power.
- 6 months: Gums and varnishes begin to form, potentially clogging fuel lines and carburetor jets.
- 1 year: Gasoline becomes increasingly unstable and may not be able to ignite properly.
The Signs of Old Gas Trouble
The symptoms of old gas trouble can vary depending on the severity of the deterioration. However, here are some common signs:
- Difficulty Starting: Your lawn mower might crank but fail to start, or it might sputter and die shortly after starting.
- Loss of Power: The mower may seem sluggish and lack its usual power.
- Engine Stalling: The engine might suddenly stall or cut out while mowing.
- Backfiring or Knocking: You might hear unusual noises coming from the engine, such as backfiring or knocking.
Troubleshooting Old Gas Issues
If you suspect old gas is the culprit, there are a few steps you can take to diagnose and resolve the issue:
1. Empty the Gas Tank
The first step is to empty the old gasoline from the tank. You can do this by draining it into a suitable container, such as a gas can, or by using a siphon pump.
2. Clean the Fuel System
Once the tank is empty, it’s important to clean the fuel system to remove any gum and varnish deposits. This may involve:
- Cleaning the Fuel Lines: Use a fuel line cleaning kit or a dedicated fuel line cleaner to flush out any deposits.
- Cleaning the Carburetor: Disassemble the carburetor and clean it thoroughly using a carburetor cleaning kit and compressed air.
- Replacing the Fuel Filter: The fuel filter traps debris and sediment, and it should be replaced regularly, especially if you suspect old gas is the problem.
3. Use Fresh Gasoline
Once you’ve cleaned the fuel system, fill the tank with fresh, high-quality gasoline. Be sure to use fuel that is specifically designed for small engines and is free of ethanol, which can accelerate fuel deterioration.
4. Start and Test
After refilling the tank with fresh gasoline, try starting the lawn mower. If it starts smoothly and runs well, then old gas was likely the problem.
Taking Preventative Measures: Avoiding Old Gas in the Future
The best way to avoid old gas problems is to prevent them in the first place. Here are some preventative measures you can take:
- Use Fresh Gasoline: Always use fresh gasoline for your lawn mower.
- Store Fuel Properly: If you won’t be using your lawn mower for a few weeks or more, store the gasoline in a sealed, airtight container in a cool, dry place.
- Add Fuel Stabilizer: Fuel stabilizer helps prevent gum and varnish formation and can extend the shelf life of gasoline for up to two years.
- Run the Engine Regularly: If you have a seasonal lawn mower, start it up and run it for a few minutes every few weeks to prevent the fuel from degrading.
Conclusion
Old gas can indeed cause a lawn mower to not start, but it is a common problem that can be easily avoided. By following the tips outlined in this article, you can ensure that your lawn mower is ready to go when you need it, and you can enjoy a healthy and well-maintained lawn all season long. Remember, using fresh fuel and storing it properly will save you headaches and keep your lawn mower running smoothly for years to come.
Frequently Asked Questions
Why does old gas make my lawnmower hard to start?
Old gas deteriorates over time, leading to a buildup of gum and varnish in the fuel system. This residue can clog the carburetor, fuel lines, and fuel filter, preventing the engine from receiving the necessary fuel to start. The fuel may also lose its volatility, making it difficult for the engine to vaporize and ignite properly.
How long does gas last in a lawnmower?
The shelf life of gasoline can vary depending on factors such as storage conditions, fuel additives, and the type of gasoline. However, it is generally recommended to use gasoline that is less than 3 months old.
What are the signs of bad gas in my lawnmower?
Bad gas in your lawnmower can manifest in various ways. You may experience difficulty starting the engine, sputtering or stalling, reduced power, or even a complete engine shutdown. The engine may also produce smoke or have a different smell.
Can I use old gas in my lawnmower?
While using old gas in your lawnmower may be tempting to save money, it is generally not recommended. Old gas can cause engine damage, leading to costly repairs. It’s always best to use fresh gasoline to ensure optimal performance and longevity of your lawnmower.
How do I fix a lawnmower with old gas?
If you suspect old gas is the culprit for your lawnmower troubles, start by draining the old fuel from the tank. Then, clean the carburetor, fuel lines, and fuel filter to remove any accumulated gum and varnish. Once cleaned, refill the tank with fresh, high-quality gasoline.
How can I prevent my gas from going bad?
To prevent your gas from going bad, store it in a clean, airtight container in a cool, dry place. You can also use fuel stabilizers, which are additives that help slow down the deterioration process and extend the shelf life of gasoline.
What should I do with old gas?
Dispose of old gas responsibly. Do not pour it down the drain or into the ground. Local waste disposal facilities may accept old gas for proper disposal. You can also mix it with absorbent materials such as kitty litter or sawdust to create a safe disposal option.