Deciding whether to empty the gas from your lawn mower before storing it, especially for the off-season, is a common question among homeowners. The answer isn’t a simple yes or no, as several factors come into play. Understanding these factors will help you make the best decision for your lawn mower and your peace of mind. This comprehensive guide will delve into the pros and cons of emptying your lawn mower’s fuel tank, explore alternative solutions, and provide expert tips to ensure your mower starts smoothly when spring arrives.
The Case for Emptying Your Lawn Mower’s Gas Tank
Leaving gasoline in your lawn mower’s fuel tank for extended periods can lead to various problems. Gasoline, particularly modern ethanol-blended fuels, can degrade over time, leading to issues that can impact your mower’s performance and longevity.
Fuel Degradation and Gum Formation
Gasoline isn’t a stable compound. Over time, it breaks down, leading to the formation of varnish and gum deposits. These sticky substances can clog the carburetor’s tiny jets and passages, preventing the engine from starting or causing it to run poorly. This is especially true for gasoline containing ethanol, which is hygroscopic, meaning it attracts and absorbs moisture from the air.
Ethanol-blended fuel can absorb water, leading to phase separation. This occurs when the water and ethanol separate from the gasoline, forming a distinct layer at the bottom of the fuel tank. This water and ethanol mixture can corrode fuel system components and prevent the engine from receiving the proper fuel mixture. This is a significant concern for long-term storage.
Carburetor Clogging and Starting Issues
A clogged carburetor is a common culprit behind lawn mower starting problems. The small jets and passages within the carburetor are easily blocked by gum and varnish deposits. This restricts fuel flow and prevents the engine from receiving the necessary fuel for combustion. Even small amounts of residue can significantly impact performance.
When you attempt to start a lawn mower with a clogged carburetor, you might experience repeated starting failures, rough idling, or a complete inability to start. Repairing or replacing a carburetor can be costly, making preventative measures like emptying the fuel tank or using fuel stabilizers a worthwhile investment.
Corrosion and Fuel System Damage
The water absorbed by ethanol-blended fuels can also lead to corrosion within the fuel system. This corrosion can damage the fuel tank, fuel lines, and other vital components. Over time, this damage can lead to leaks and further performance problems.
Corrosion can also affect the carburetor itself, causing it to malfunction and require replacement. The cost of replacing these components can quickly add up, highlighting the importance of proper fuel management during storage. Preventing corrosion is key to extending the life of your lawn mower.
The Arguments Against Emptying the Gas Tank
While there are compelling reasons to empty your lawn mower’s fuel tank, there are also some arguments against it. Emptying the tank completely can sometimes create its own set of problems.
Potential for Rust Formation
Completely emptying the fuel tank can leave it susceptible to rust formation, particularly in older models with metal fuel tanks. The exposed metal can react with moisture in the air, leading to rust, which can then flake off and clog the fuel system.
While this is more of a concern for older mowers, it’s still a factor to consider, especially if you live in a humid environment. A small amount of fuel, treated with a fuel stabilizer, can sometimes offer better protection against rust than an empty tank.
Inconvenience and Mess
Emptying a lawn mower’s fuel tank can be a messy and inconvenient process. You’ll need a suitable container to collect the fuel, and you’ll need to dispose of it properly. Spilling gasoline can create a fire hazard and can also damage the environment.
Furthermore, some lawn mowers have fuel tanks that are difficult to drain completely. This can leave a small amount of fuel in the tank, which can still degrade and cause problems.
Alternative Solutions: Fuel Stabilizers
Rather than completely emptying the fuel tank, a more practical approach is to use a fuel stabilizer. Fuel stabilizers are additives that prevent gasoline from degrading over time. They work by inhibiting oxidation and preventing the formation of gum and varnish deposits.
How Fuel Stabilizers Work
Fuel stabilizers contain antioxidants and corrosion inhibitors that protect the fuel and fuel system components. The antioxidants prevent the gasoline from oxidizing, which is the primary cause of fuel degradation. The corrosion inhibitors protect metal parts from rust and corrosion caused by water absorption.
By adding a fuel stabilizer to your lawn mower’s fuel tank before storage, you can keep the fuel fresh and prevent it from causing problems. This eliminates the need to empty the tank and reduces the risk of rust formation. Using a fuel stabilizer is a proactive step to preserve your mower’s engine.
Choosing the Right Fuel Stabilizer
There are many different fuel stabilizers available on the market. Look for a stabilizer that is specifically designed for use in small engines. Some stabilizers are also formulated to address the problems associated with ethanol-blended fuels.
Read the product label carefully and follow the manufacturer’s instructions for proper dosage. Adding too much stabilizer can be just as harmful as not adding enough. Always adhere to the recommended dosage for optimal performance.
Proper Usage of Fuel Stabilizers
To use a fuel stabilizer effectively, add the correct amount to the fuel tank according to the manufacturer’s instructions. Then, run the lawn mower for a few minutes to allow the stabilized fuel to circulate throughout the fuel system, including the carburetor. This ensures that all components are protected.
If you’re storing your lawn mower for an extended period, consider running it until the stabilized fuel has completely replaced the old fuel in the carburetor. This will provide maximum protection against gum and varnish formation.
Best Practices for Lawn Mower Storage
Regardless of whether you choose to empty the fuel tank or use a fuel stabilizer, there are other best practices you should follow to ensure your lawn mower is properly stored for the off-season.
Cleaning the Mower Deck
Before storing your lawn mower, thoroughly clean the mower deck to remove any grass clippings or debris. Grass clippings can trap moisture and lead to rust formation on the underside of the deck. Use a scraper or a stiff brush to remove stubborn debris.
You can also use a garden hose to rinse the mower deck, but be sure to dry it thoroughly afterward to prevent rust. Consider applying a coat of rust-resistant paint to the underside of the deck to further protect it. A clean mower deck is a happy mower deck.
Changing the Oil
It’s also a good idea to change the oil before storing your lawn mower. Old oil can contain acids and contaminants that can corrode engine components over time. Changing the oil will help to protect the engine and prolong its life.
Refer to your lawn mower’s owner’s manual for the recommended oil type and change interval. Be sure to dispose of the used oil properly at a designated recycling center.
Removing the Spark Plug
Removing the spark plug and adding a small amount of oil to the cylinder can help to prevent rust and corrosion inside the engine. Pour about a teaspoon of oil into the spark plug hole, then slowly pull the starter cord a few times to distribute the oil throughout the cylinder.
Reinstall the spark plug, but do not connect the spark plug wire. This will prevent the engine from accidentally starting during storage.
Storing in a Dry Location
Store your lawn mower in a dry, sheltered location, such as a garage or shed. Avoid storing it outdoors, where it will be exposed to the elements. Moisture can lead to rust and corrosion, while sunlight can degrade rubber and plastic components.
If you must store your lawn mower outdoors, cover it with a waterproof tarp to protect it from the weather. Be sure to secure the tarp tightly to prevent it from blowing away.
Battery Care for Electric Mowers
If you own an electric lawn mower, proper battery care is essential for long-term storage. Remove the battery from the mower and store it in a cool, dry place. Avoid storing the battery in extreme temperatures, as this can damage it.
Charge the battery periodically during the storage period to prevent it from completely discharging. A fully discharged battery can be difficult or impossible to recharge. Refer to your lawn mower’s owner’s manual for specific battery care instructions. Proper battery maintenance is crucial for electric mower longevity.
Expert Tips for a Smooth Spring Start
Following these expert tips will increase the likelihood of your lawn mower starting smoothly when you’re ready to use it again in the spring.
Check the Air Filter
Before starting your lawn mower after storage, check the air filter. A dirty air filter can restrict airflow to the engine, causing it to run poorly or not start at all. Replace the air filter if it’s dirty or damaged.
Inspect the Spark Plug
Inspect the spark plug for signs of wear or damage. A fouled spark plug can also prevent the engine from starting. Clean the spark plug with a wire brush or replace it if necessary.
Use Fresh Fuel
Even if you used a fuel stabilizer, it’s a good idea to use fresh fuel when you start your lawn mower in the spring. Gasoline can still degrade over time, even with a stabilizer. Drain any remaining fuel from the tank and replace it with fresh fuel.
Prime the Engine
Most lawn mowers have a priming bulb that you can press to prime the engine before starting. Press the priming bulb several times to ensure that fuel is reaching the carburetor.
Pull the Starter Cord Firmly
When you pull the starter cord, pull it firmly and smoothly. Avoid yanking on the cord, as this can damage the starter mechanism. If the engine doesn’t start after a few pulls, check the spark plug and fuel supply.
Conclusion: Make an Informed Decision
Ultimately, the decision of whether to empty the gas from your lawn mower before storage is a personal one. Weigh the pros and cons carefully and consider your individual circumstances. If you’re unsure, using a fuel stabilizer is generally a safe and effective approach.
By following these guidelines and best practices, you can help to ensure that your lawn mower is properly stored and ready to use when spring arrives. A little bit of preventative maintenance can save you time, money, and frustration in the long run. Choose the approach that best suits your needs and enjoy a hassle-free lawn mowing season.
Why should I consider emptying the gas from my lawn mower?
Emptying the gas tank of your lawn mower before storing it for an extended period, especially during the off-season, is highly recommended. Gasoline, over time, can degrade and become stale. This stale fuel can lead to starting problems and poor engine performance the next time you try to use your mower.
Furthermore, as gasoline degrades, it can leave behind gummy deposits and varnish in the carburetor and fuel lines. These deposits can clog the fuel system, requiring costly repairs or even rendering the mower unusable. Emptying the tank and running the engine until it stalls helps prevent these issues and extends the lifespan of your lawn mower.
What are the potential consequences of leaving gas in a lawn mower for too long?
Leaving gasoline in your lawn mower’s tank for an extended duration can have several negative effects. The fuel can begin to separate and oxidize, forming a sticky residue that can damage the fuel system components. This residue can block fuel lines, jets in the carburetor, and even gum up the valves.
This gunk buildup can lead to hard starting, rough idling, and reduced engine power. In severe cases, it can prevent the mower from starting altogether, requiring professional cleaning or replacement of the carburetor. Moreover, old gasoline can lose its octane rating, further impacting engine performance and potentially causing damage.
How long is too long to leave gas in a lawn mower?
Generally, gasoline begins to degrade noticeably after about 30 days, but problems might not be significant until after a few months. However, to be on the safe side, it’s best to consider emptying the fuel tank if the mower will be stored for more than one month. Factors like fuel quality and storage conditions can also affect how quickly the gas deteriorates.
For optimal engine health and ease of starting next season, plan to remove the fuel or add a fuel stabilizer if the lawn mower will be stored for more than a month or two. Fuel stabilizers can extend the lifespan of the fuel, but it’s still a good idea to drain the tank if the storage period is very long, such as over the winter.
What are the different methods for emptying the gas from a lawn mower?
There are a few common methods for emptying the gas tank of your lawn mower. One method is to siphon the fuel out using a siphon pump or a hose. Another approach is to simply run the engine until all the fuel is used up. The method you choose depends on your comfort level and the tools you have available.
Additionally, some lawn mower models have a fuel drain valve located on the carburetor or fuel tank. This valve allows you to drain the fuel more easily and cleanly. Always consult your owner’s manual for specific instructions related to your particular mower model and safety precautions.
Is it better to use fuel stabilizer instead of emptying the gas tank?
Using a fuel stabilizer is a good alternative to completely emptying the gas tank, especially if you only plan to store the mower for a few months. Fuel stabilizers work by preventing the gasoline from breaking down and forming gum and varnish. They also help to protect the fuel system from corrosion.
However, for long-term storage, such as over the winter months, it’s generally better to empty the gas tank completely. While fuel stabilizer can extend the life of the fuel, it’s not a foolproof solution. Over very long periods, even stabilized fuel can degrade and cause problems.
What safety precautions should I take when emptying gas from a lawn mower?
Safety is paramount when dealing with gasoline. Always work in a well-ventilated area, away from open flames or sources of ignition. Gasoline fumes are flammable and can be explosive. Wear appropriate safety glasses and gloves to protect yourself from spills and splashes.
When emptying the tank, use a proper fuel-safe container to collect the gasoline. Avoid spilling any fuel, and if a spill does occur, clean it up immediately with absorbent materials like rags or paper towels. Dispose of the used gasoline and cleaning materials properly, following local regulations for hazardous waste disposal.
What should I do with the old gasoline I removed from the lawn mower?
Proper disposal of old gasoline is crucial for environmental safety. Never pour gasoline down the drain, into the sewer, or onto the ground. These practices can contaminate water sources and harm the environment.
The best option is to take the old gasoline to a local hazardous waste collection facility or recycling center. Many communities offer programs for collecting and disposing of hazardous household waste, including gasoline. Contact your local waste management authority for information on disposal options in your area.