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Leaving gas in your lawn mower seems like a convenient way to save time. However, it’s a practice that can lead to a host of problems. Understanding the potential consequences and knowing how to properly store your mower is crucial for maintaining its performance and extending its lifespan. This comprehensive guide will delve into the intricacies of fuel storage in lawn mowers, offering practical advice and best practices.
The Perils of Leaving Gas in Your Lawn Mower
The simple answer is: generally, no, you shouldn’t leave gas in your lawn mower for extended periods. The fuel we use today isn’t the same as it was decades ago. Modern gasoline contains ethanol, and this changes everything.
The Ethanol Factor
Ethanol is added to gasoline for several reasons, including increasing octane levels and reducing emissions. While it has benefits, it also has some significant drawbacks when it comes to small engines like those found in lawn mowers.
Water Absorption
Ethanol is hygroscopic, meaning it readily absorbs water from the atmosphere. This is a major concern for lawn mowers that sit idle for weeks or months. Water in the fuel tank can lead to several issues:
- Corrosion: Water can corrode metal parts in the fuel system, including the fuel tank, carburetor, and fuel lines.
- Phase Separation: When gasoline absorbs too much water, it can lead to phase separation. This occurs when the ethanol and water separate from the gasoline, forming a layer of water and ethanol at the bottom of the tank. This layer is highly corrosive and won’t burn properly, leading to engine starting and running problems.
- Reduced Fuel Efficiency: Water contamination dilutes the gasoline, reducing its octane rating and overall energy content. This can result in decreased fuel efficiency and poor engine performance.
Gum and Varnish Formation
As gasoline sits, it can degrade and form gum and varnish deposits. These sticky residues can clog fuel lines, jets in the carburetor, and other vital engine components. This can lead to:
- Difficulty Starting: A clogged carburetor can prevent the engine from getting the fuel it needs to start.
- Rough Running: Even if the engine does start, gum and varnish deposits can cause it to run rough, misfire, or stall.
- Engine Damage: In severe cases, gum and varnish can cause engine damage, requiring costly repairs.
The Impact of Time
How long can you leave gas in your lawn mower before problems arise? The answer depends on several factors, including the type of gasoline, the storage conditions, and the age of the mower.
Short-Term Storage (1-2 Months)
If you plan to use your lawn mower within a month or two, leaving gas in the tank may not cause significant problems, especially if you use fuel stabilizer. However, it’s still a good idea to take precautions.
Long-Term Storage (Over 2 Months)
For periods longer than two months, leaving untreated gasoline in your lawn mower is almost guaranteed to cause problems. The longer the fuel sits, the more likely it is to degrade and cause issues.
Best Practices for Fuel Storage in Lawn Mowers
Fortunately, there are several things you can do to prevent fuel-related problems and keep your lawn mower running smoothly.
Using Fuel Stabilizer
Fuel stabilizer is a chemical additive that helps to prevent gasoline from degrading and forming gum and varnish. It also helps to protect against water absorption and phase separation.
How to Use Fuel Stabilizer
Using fuel stabilizer is simple:
- Add the correct amount of stabilizer to the gasoline according to the manufacturer’s instructions.
- Run the engine for a few minutes to circulate the treated fuel throughout the fuel system.
When to Use Fuel Stabilizer
Use fuel stabilizer whenever you’re storing your lawn mower for more than a few weeks. It’s also a good idea to use it year-round, especially if you don’t use your mower frequently.
Draining the Fuel Tank
Another option is to drain the fuel tank completely before storing your lawn mower. This eliminates the risk of fuel degradation and water absorption.
How to Drain the Fuel Tank
- Allow the engine to cool completely.
- Locate the fuel shut-off valve (if your mower has one) and turn it off.
- Disconnect the fuel line from the carburetor.
- Place a container under the fuel line to catch the gasoline.
- Open the fuel shut-off valve (if applicable) and allow the fuel to drain completely.
- Once the tank is empty, reconnect the fuel line.
Running the Carburetor Dry
After draining the fuel tank, it’s a good idea to run the carburetor dry. This will help to remove any remaining fuel from the carburetor and prevent gum and varnish deposits from forming.
- Start the engine and let it run until it stalls.
- Try to start the engine a few more times to ensure that all the fuel is used.
Using Ethanol-Free Gasoline
Ethanol-free gasoline is a great option for lawn mowers and other small engines. Since it doesn’t contain ethanol, it’s not susceptible to water absorption and phase separation.
Finding Ethanol-Free Gasoline
Ethanol-free gasoline can be found at some gas stations, marinas, and small engine repair shops. It’s often labeled as “premium” or “recreational” gasoline. You can also use online resources to find stations that sell ethanol-free fuel in your area.
Proper Storage Conditions
Storing your lawn mower in a dry, sheltered location can also help to prevent fuel-related problems.
Avoid Moisture
Moisture can accelerate fuel degradation and corrosion. Store your lawn mower in a garage, shed, or other covered area to protect it from rain, snow, and humidity.
Temperature Fluctuations
Extreme temperature fluctuations can also contribute to fuel degradation. Avoid storing your lawn mower in direct sunlight or in areas where temperatures fluctuate widely.
Additional Maintenance Tips for Lawn Mower Fuel Systems
In addition to proper fuel storage, there are several other maintenance tasks you can perform to keep your lawn mower’s fuel system in good condition.
Cleaning the Carburetor
A dirty carburetor can cause a variety of engine problems. Cleaning the carburetor periodically can help to prevent these problems.
When to Clean the Carburetor
Clean the carburetor if you notice any of the following symptoms:
- Difficulty starting
- Rough running
- Stalling
- Poor fuel efficiency
How to Clean the Carburetor
Carburetor cleaning usually involves disassembling the carburetor and soaking the parts in carburetor cleaner. Consult your lawn mower’s owner’s manual for specific instructions.
Replacing the Fuel Filter
The fuel filter prevents dirt and debris from entering the carburetor. A clogged fuel filter can restrict fuel flow and cause engine problems.
When to Replace the Fuel Filter
Replace the fuel filter annually or more often if you use your lawn mower frequently or if you notice any signs of fuel starvation.
Inspecting Fuel Lines
Inspect the fuel lines regularly for cracks, leaks, and other damage. Replace any damaged fuel lines immediately.
The Bottom Line: Protecting Your Lawn Mower Investment
Leaving gas in your lawn mower for extended periods is a risky practice that can lead to a variety of problems. By following the tips outlined in this guide, you can protect your lawn mower’s fuel system and keep it running smoothly for years to come. Using fuel stabilizer, draining the fuel tank, using ethanol-free gasoline, and storing your mower in a dry location are all effective ways to prevent fuel-related problems. Regular maintenance, such as cleaning the carburetor and replacing the fuel filter, can also help to keep your lawn mower in top condition. Remember, a little preventative maintenance can save you a lot of time and money in the long run.
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Can I leave gas in my lawn mower over the winter?
Leaving gasoline in your lawn mower over the winter is generally not recommended. Gasoline can degrade over time, especially when exposed to air and moisture. This degradation can lead to the formation of gum and varnish deposits in the carburetor and fuel lines, potentially causing starting problems and reduced engine performance when you try to use the mower again in the spring.
Furthermore, old gasoline can lose its combustibility and octane rating, which can also affect how efficiently your engine runs. Stale fuel can also attract water, which can lead to rust and corrosion within the fuel system. It’s best to either drain the fuel tank completely or add a fuel stabilizer to the gasoline before storing your mower for the winter to prevent these issues.
What happens if I leave gas in my lawn mower for a long time?
Leaving gasoline in your lawn mower for an extended period, such as several months during the off-season, can have several negative consequences. The fuel can begin to break down and oxidize, leading to the formation of sticky residue that clogs the carburetor jets and fuel lines. This can make starting the mower difficult or impossible and may necessitate a costly carburetor cleaning or replacement.
Additionally, the fuel’s volatility decreases, making it harder for the engine to ignite properly. Water can also condense within the fuel tank, causing rust and corrosion. This contamination can damage the fuel system and require extensive repairs. Therefore, it’s wise to address the fuel situation before long-term storage.
How can I prevent gas from going bad in my lawn mower?
The best way to prevent gasoline from going bad in your lawn mower is to use a fuel stabilizer. Fuel stabilizers contain additives that prevent oxidation and keep the fuel fresh for an extended period. Simply add the recommended amount of stabilizer to the fuel tank according to the product instructions, run the engine for a few minutes to circulate the treated fuel throughout the fuel system, and then store the mower.
Another effective method is to completely drain the fuel tank and carburetor before storing the mower. This eliminates the potential for fuel degradation and the formation of deposits. When draining, ensure you dispose of the gasoline properly according to local regulations. Either method will protect your mower’s fuel system during periods of inactivity.
Is it better to drain the gas or use a fuel stabilizer?
Whether it’s better to drain the gas or use a fuel stabilizer depends on your preference and how long you plan to store the lawn mower. Draining the fuel tank and carburetor completely eliminates the risk of fuel degradation and deposits, providing a clean slate for the next season. This is a reliable method, particularly if you’re comfortable performing the task and have a safe way to dispose of the old fuel.
Using a fuel stabilizer is often more convenient, especially if you don’t want to deal with draining and disposing of gasoline. A good stabilizer will keep the fuel fresh and prevent it from damaging the fuel system. It’s a simple and effective option for those who prefer a less hands-on approach. Ultimately, both methods are viable and can protect your lawn mower from fuel-related problems.
What type of fuel stabilizer should I use?
When selecting a fuel stabilizer for your lawn mower, look for a product specifically designed for small engines or outdoor power equipment. These stabilizers often contain additional additives to protect against corrosion and moisture, which are particularly important for lawn mower engines that may be exposed to the elements. Read the product label carefully to ensure it is compatible with the type of fuel you use in your mower (e.g., regular unleaded or ethanol-blended fuel).
Reputable brands such as STA-BIL, Sea Foam, and Lucas Oil offer fuel stabilizers that are widely used and trusted by lawn mower owners. Consider the size of your fuel tank and how long you plan to store the mower when choosing the right amount of stabilizer to purchase. Follow the manufacturer’s instructions for the correct dosage and application to ensure optimal protection for your mower’s fuel system.
How do I properly drain the gas from my lawn mower?
To properly drain the gas from your lawn mower, first ensure the engine is cool and that you are working in a well-ventilated area away from any open flames or sparks. Locate the fuel shut-off valve (if your mower has one) and turn it to the “off” position. Then, disconnect the fuel line from the carburetor and direct it into a suitable container, such as a gasoline can, to catch the draining fuel.
If your mower doesn’t have a fuel shut-off valve, you may need to use a siphon or a fuel-transfer pump to remove the gasoline from the tank. Once the fuel tank is empty, start the engine and let it run until it stalls to ensure that any remaining fuel in the carburetor is used up. Dispose of the used gasoline properly according to your local regulations.
Can I use old gas from my lawn mower in my car?
Using old gasoline from your lawn mower in your car is generally not advisable. While it might seem like a way to avoid waste, the degraded fuel could cause problems in your car’s engine. Gasoline that has sat for an extended period can lose its octane rating and form gum and varnish deposits that can clog fuel injectors and other sensitive components of your vehicle’s fuel system.
Modern car engines are designed to run on fuel with specific properties, and using old or contaminated gasoline can lead to reduced performance, misfires, and potentially even damage to the engine. It’s best to dispose of old lawn mower fuel properly and use fresh gasoline in your car to ensure optimal performance and longevity.