The crisp air bites, leaves fall, and the lawn mower begins to gather dust. As the season changes, so does the fate of your trusty lawn care machine. But a question lingers: should you leave gas in your lawn mower over winter? This question, seemingly simple, can have significant implications for the health of your mower and its performance next spring. This article delves into the pros and cons of leaving gas in your lawn mower, offering insights to help you make the best decision for your equipment.
In short, it is generally recommended to drain the gas from your lawn mower before storing it for winter. Leaving gas in the tank can lead to the formation of gum and varnish, clogging the fuel system and hindering your mower’s performance come springtime. However, there are exceptions to this rule, particularly if you use a fuel stabilizer and have a specific type of mower. We’ll explore these nuances and provide practical tips for preparing your lawn mower for a successful hibernation.
The Case Against Leaving Gas in Your Lawn Mower
While convenience might tempt you to leave the gas in your mower, doing so can lead to a range of problems. Here’s why you should consider draining the fuel before storing your lawn mower:
Fuel Degradation and Gum Formation
Gasoline is a volatile compound that deteriorates over time, particularly when exposed to the elements. This degradation leads to the formation of gum and varnish, sticky residues that can clog the fuel lines, carburetor, and other parts of your mower’s fuel system. This can result in:
- Difficult Starting: A gummed-up fuel system can make starting your mower extremely difficult, requiring multiple pulls or even a complete overhaul.
- Reduced Power: Clogged fuel lines restrict fuel flow, leading to a decrease in engine power and overall performance.
- Fuel Leakage: Degraded fuel can leak from the carburetor or fuel lines, potentially causing damage to your mower or posing environmental hazards.
Ethanol’s Role in Fuel Deterioration
Modern gasoline often contains ethanol, a biofuel that helps reduce emissions. However, ethanol attracts moisture, accelerating the process of fuel degradation. When ethanol absorbs moisture, it forms a substance called “phase separation,” a mixture of water and ethanol that can damage your mower’s fuel system.
Preventing Ethanol-Related Issues
- Use Ethanol-Free Fuel: If you’re concerned about ethanol-related problems, consider using ethanol-free gas, often found at marinas or specialized fuel stations.
- Fuel Stabilizer: Adding a fuel stabilizer to your gas tank can help prevent the formation of gum and varnish by binding to water molecules and slowing down the degradation process.
Condensation and Corrosion
The temperature fluctuations during winter can cause condensation to form inside your mower’s fuel tank. This condensation can mix with the gas, leading to rust and corrosion within the fuel system. These corrosive effects can severely damage your mower’s components.
Keeping Condensation at Bay
- Store Mower Indoors: Storing your mower indoors in a dry environment minimizes the risk of condensation formation.
- Fuel Tank Vent: Ensure the fuel tank vent is clear and unobstructed to allow for air circulation and prevent pressure buildup that could force condensation into the tank.
The Case for Leaving Gas in Your Lawn Mower
While draining the gas is generally recommended, there are specific scenarios where leaving it in the tank might be acceptable:
Fuel Stabilizer Usage
Using a high-quality fuel stabilizer can effectively counteract the negative effects of fuel degradation. These stabilizers chemically bind to water molecules, preventing phase separation and gum formation. By using a stabilizer, you can keep your fuel usable for longer periods, potentially allowing you to store gas in your mower over winter.
Considerations for Using Fuel Stabilizer
- Type of Stabilizer: Choose a stabilizer specifically designed for gasoline engines and follow the manufacturer’s instructions carefully.
- Timeframe: Fuel stabilizers are effective for a limited time. Check the product’s label for the recommended storage duration.
- Regular Maintenance: Even with a stabilizer, it’s crucial to run your mower periodically to ensure the fuel system remains active.
Specific Mower Types
Some lawn mowers, especially those with fuel injection systems, are better equipped to handle stored fuel. Modern fuel injection systems often have a built-in mechanism that minimizes the risk of gum formation and corrosion.
Checking Your Mower’s Manual
- Fuel Injection Systems: Refer to your mower’s manual for information on its fuel system and whether it is compatible with stored fuel.
- Manufacturer Recommendations: Always prioritize the manufacturer’s guidelines for storing your specific lawn mower model.
Best Practices for Storing Your Lawn Mower Over Winter
Regardless of whether you decide to drain the gas or use a stabilizer, here are some best practices to ensure your lawn mower is properly prepped for winter:
1. Drain the Fuel
- Complete Drain: If you choose to drain the gas, make sure to completely empty the tank and fuel lines.
- Run the Engine: After draining, run the engine for a few seconds to ensure all fuel is consumed.
- Proper Disposal: Dispose of the drained gas responsibly. Do not pour it down the drain. Contact your local waste management facility for guidance on safe disposal.
2. Clean the Mower
- Thorough Cleaning: Clean your mower thoroughly, removing all debris and grass clippings.
- Sharpen Blades: Sharpen the blades to ensure a clean cut next spring.
- Lubricate Parts: Lubricate moving parts, like the wheels, bearings, and engine.
3. Store in a Dry Environment
- Indoor Storage: Ideally, store your mower indoors in a dry, well-ventilated space.
- Covering: If outdoor storage is necessary, use a breathable cover to protect your mower from moisture and debris.
4. Replace Air Filter
- Clean or Replace: Clean or replace the air filter before storing your mower.
- Proper Filtration: A clean air filter ensures optimal engine performance and prevents dust and dirt from entering the engine.
5. Remove Battery (if applicable)
- Charging: Fully charge the battery before storing.
- Storage: Store the battery in a cool, dry place, or remove it entirely and store it separately.
Conclusion: Making the Right Choice
The decision of whether to leave gas in your lawn mower over winter ultimately depends on your specific circumstances and your level of comfort with potential risks. While draining the gas is generally the safest and most recommended approach, using a high-quality fuel stabilizer in a fuel-injection equipped mower can be a viable alternative. Remember to always refer to your mower’s manual for specific instructions and recommendations. By following proper storage practices and taking preventive measures, you can ensure your lawn mower is ready to tackle your next spring landscaping project.
FAQ
Why should I empty the gas from my lawn mower for the winter?
Leaving gas in your lawn mower over the winter can cause several problems. Gasoline degrades over time, especially in cold temperatures. This degradation leads to the formation of varnish and gum, which can clog fuel lines, carburetor jets, and other engine components. Additionally, the ethanol in modern gasoline attracts moisture, which can also freeze and block fuel flow.
These problems can make it difficult or impossible to start your lawn mower in the spring. You may need to spend time and money cleaning or replacing parts, or even worse, your lawn mower might require major repairs.
Can I use a fuel stabilizer to prevent these problems?
While fuel stabilizers can help slow down the degradation of gasoline, they don’t eliminate the problem entirely. Stabilizers can also be less effective in extreme cold temperatures. The best approach is to empty the gas tank and run the engine until it runs out of fuel before storing your lawn mower.
How do I drain the gas from my lawn mower?
To drain the gas, first, disconnect the spark plug wire to prevent the engine from starting accidentally. Then, locate the fuel shut-off valve and turn it to the off position. Next, find the drain plug on the bottom of the gas tank, and use a wrench or socket to loosen it. Allow the gas to drain into a container that you can properly dispose of. Finally, tighten the drain plug back up.
What about the gas in the carburetor?
After draining the gas tank, you can also drain the gas from the carburetor. This will help to prevent varnish and gum build-up in the delicate carburetor jets. To do this, start by removing the fuel line from the carburetor. Then, carefully tilt the carburetor to drain any remaining gas into a container. Once drained, replace the fuel line.
What if I can’t drain the gas before storing my lawn mower?
If you can’t drain the gas tank before storing your lawn mower for the winter, there are some things you can do to minimize the risk of problems. First, add a fuel stabilizer to the gas tank according to the instructions on the bottle. Then, run the lawn mower for a few minutes to distribute the stabilizer throughout the fuel system. This will help to prevent the gas from degrading and forming varnish.
Can I use a gas-powered lawn mower in cold weather?
Gas-powered lawn mowers can be used in cold weather, but they may not perform as well as they do in warmer temperatures. The engine may start more slowly, and the mower may not run as smoothly. Additionally, the cold weather can cause the oil in the engine to thicken, leading to increased wear and tear. You may want to consider using a different type of lawn mower, like an electric model, in the colder months.
How often should I check my lawn mower’s gas tank for moisture?
It’s a good idea to check your lawn mower’s gas tank for moisture at least once a month, even during the winter months. You can do this by simply looking for any condensation inside the tank. If you see any moisture, you should drain the gas and add fresh, stabilized gasoline. If your lawn mower is stored in a heated garage, you’ll likely have fewer problems with condensation.