The days are getting shorter, the leaves are changing color, and that familiar chill is in the air. This can only mean one thing: winter is coming. For many homeowners, winter’s approach signals the end of lawn care season, and that means putting away the lawn mower. But before you tuck your trusty grass-cutting companion into the garage or shed for its long winter nap, there’s an important question to address: Should you run all the gas out of your mower before winter storage? The answer isn’t as straightforward as you might think, and neglecting proper winterization can lead to frustrating starting problems next spring and potentially costly repairs.
The Gasoline Problem: Why Fuel Goes Bad
Modern gasoline isn’t what it used to be. While older formulations were relatively stable, today’s gasoline blends often contain ethanol. Ethanol is an alcohol added to gasoline for several reasons, including increasing octane levels and reducing reliance on fossil fuels. However, ethanol has a significant drawback: it’s hygroscopic, meaning it readily absorbs moisture from the air.
Ethanol’s Moisture Magnetism
This water absorption is the root of many fuel-related problems in stored engines. As ethanol-blended gasoline sits in your mower’s fuel tank over the winter, it attracts moisture. This water can separate from the gasoline, creating a layer of water at the bottom of the tank. This process is called phase separation.
The Consequences of Phase Separation
The separated water can then corrode or rust metal parts within the fuel system, including the fuel tank, fuel lines, and carburetor. Furthermore, the gasoline itself can degrade over time, forming gums and varnishes that can clog fuel passages and jets in the carburetor. Starting the mower with gummy, water-contaminated fuel can be difficult, if not impossible. In severe cases, you might need to have the carburetor professionally cleaned or even replaced. That’s an expense no one wants to deal with come spring!
The Great Debate: Empty vs. Stabilized
The question of whether to run the gas out of your mower before winter often sparks lively debate among lawn care enthusiasts. There are compelling arguments on both sides, and the best approach for you will depend on several factors.
The Case for Running the Gas Out
The primary argument for running the gas tank dry is to eliminate the potential for phase separation and gum formation altogether. By removing the fuel, you theoretically eliminate the source of the problem. Advocates of this method often suggest running the mower until it stalls and then disconnecting the fuel line to drain any remaining fuel from the carburetor bowl.
Potential Drawbacks of Running the Tank Dry
While seemingly logical, running the tank completely dry isn’t without its downsides. First, it can be difficult to ensure that absolutely every drop of fuel is removed, especially from the carburetor. Any residual fuel can still evaporate and leave behind gummy deposits. Second, running the mower dry can expose metal parts to air, increasing the risk of rust and corrosion. Empty fuel tanks are also prone to condensation, which can introduce moisture even if you’ve diligently drained the system.
The Case for Fuel Stabilizer
The alternative to running the gas out is to use a fuel stabilizer. Fuel stabilizers are additives designed to prevent fuel degradation, inhibit rust and corrosion, and keep the fuel system clean. When used correctly, a fuel stabilizer can keep your gasoline fresh and your mower’s fuel system protected throughout the winter.
How Fuel Stabilizer Works
Fuel stabilizers work by chemically bonding with the gasoline, preventing it from breaking down and forming gums and varnishes. They also contain corrosion inhibitors to protect metal parts from rust and water damage. Additionally, some fuel stabilizers contain detergents that help clean existing deposits from the fuel system.
Using Fuel Stabilizer Effectively
To use fuel stabilizer effectively, you should add it to the fuel tank according to the manufacturer’s instructions. Then, run the mower for a few minutes to allow the stabilized fuel to circulate throughout the fuel system, including the carburetor. This ensures that all the fuel in the system is treated and protected. It’s also a good idea to use fresh gasoline when adding stabilizer. Don’t try to stabilize fuel that’s already been sitting in the tank for several months.
Making the Right Choice for Your Mower
So, should you run all the gas out of your mower before winter, or should you use a fuel stabilizer? The answer depends on your individual circumstances and preferences.
Factors to Consider
Several factors can influence your decision, including:
- The age and condition of your mower: Older mowers with more complex carburetors may benefit more from fuel stabilizer, as running them dry can be difficult and may damage seals.
- The type of gasoline you use: If you consistently use non-ethanol gasoline, the risk of phase separation is significantly reduced, and you may not need to take any special precautions.
- Your storage environment: If you store your mower in a damp or humid environment, using fuel stabilizer is especially important to protect against rust and corrosion.
- Your personal preference: Some people simply prefer the peace of mind that comes with running the tank dry, while others find fuel stabilizer more convenient.
General Recommendations
Here are some general recommendations based on the factors listed above:
- If you use ethanol-blended gasoline and store your mower in a humid environment: Use fuel stabilizer. This is the safest bet for preventing fuel-related problems.
- If you use non-ethanol gasoline and store your mower in a dry environment: Running the tank dry or using fuel stabilizer are both acceptable options. The choice is largely a matter of personal preference.
- If you have an older mower with a complex carburetor: Use fuel stabilizer. Running these mowers dry can be tricky and may cause damage.
- If you are unsure: When in doubt, use fuel stabilizer. It’s a relatively inexpensive and easy way to protect your mower’s fuel system.
Beyond Fuel: Comprehensive Winterization Tips
Regardless of whether you choose to run the gas out or use fuel stabilizer, there are several other steps you should take to winterize your lawn mower properly.
Clean the Mower Deck
Before storing your mower, thoroughly clean the underside of the deck. Grass clippings and debris can trap moisture, leading to rust and corrosion. Use a scraper or putty knife to remove any caked-on grass, and then rinse the deck with a hose. Allow the deck to dry completely before storing the mower.
Sharpen the Blade
A sharp mower blade makes for a cleaner cut and reduces stress on the engine. Before storing your mower, remove the blade and sharpen it using a file or grinding wheel. Be sure to balance the blade after sharpening to prevent vibration.
Change the Oil
Changing the oil before winter storage helps remove contaminants that can cause corrosion and wear. Consult your owner’s manual for the recommended oil type and change interval.
Replace the Air Filter
A clean air filter ensures that your engine runs efficiently. Replace the air filter if it is dirty or clogged.
Remove the Spark Plug
Removing the spark plug and adding a small amount of oil to the cylinder can help prevent rust and corrosion. Pour a teaspoon of oil into the spark plug hole, then slowly pull the starter cord a few times to distribute the oil. Reinstall the spark plug.
Store the Mower Properly
Store your mower in a dry, sheltered location, such as a garage or shed. Cover the mower with a tarp or cover to protect it from dust and moisture. Avoid storing the mower directly on the ground, as this can promote rust.
The Bottom Line: Preparation Prevents Problems
Winterizing your lawn mower properly is an essential part of lawn care maintenance. Taking the time to prepare your mower for storage will help ensure that it starts easily and runs smoothly when you need it next spring. Whether you choose to run the gas out, use a fuel stabilizer, or both, following these tips will help protect your investment and keep your lawn looking its best for years to come. Remember that proper maintenance extends the life of your equipment and saves you money in the long run. A little effort now will save you headaches later.
Why is it even suggested to run the gas out of my mower before winter storage?
Leaving gasoline in your lawnmower over the winter months can lead to several problems. Over time, gasoline degrades and can form a gummy residue that clogs the carburetor and fuel lines. This residue makes it difficult to start the mower in the spring and can even damage the engine. Stabilizing the fuel, draining it, or running the engine dry are all common strategies to mitigate these issues.
Modern gasoline often contains ethanol, which attracts moisture. This moisture can cause corrosion in the fuel system and lead to further degradation of the gasoline. This separation of water and fuel can significantly hinder the engine’s performance and lifespan. Therefore, preventing these issues before storing your mower for winter is vital for optimal engine health and performance in the long run.
Is it always necessary to run the gas out? What are the alternatives?
While running the gas tank completely dry is one method for winterizing your mower, it’s not the only option. A popular alternative is to use a fuel stabilizer. Fuel stabilizers prevent the gasoline from degrading and forming gum or varnish. They also help to prevent the separation of water and fuel. When used correctly, a fuel stabilizer can eliminate the need to completely drain the fuel tank.
Another option, if you prefer not to run the engine dry, is to drain the fuel tank manually. This involves siphoning the gasoline out of the tank into an approved container. This method allows you to remove the old fuel without running the engine and ensures that no fuel is left to degrade inside the mower. Be sure to dispose of the used gasoline responsibly, following local regulations.
How exactly do I run the gas out of my mower? What are the steps?
The process of running the gas out of your mower is relatively straightforward. First, ensure the mower is in a well-ventilated area. Then, start the mower and let it run until it stalls due to lack of fuel. It’s important to let it run until it quits on its own rather than manually stopping it while fuel remains in the carburetor.
After the mower stalls, attempt to start it a few more times to ensure all remaining fuel in the carburetor is used up. This prevents any residual fuel from sitting and potentially causing issues during storage. Once you are sure that the mower is completely out of gas, it is ready for winter storage.
What is a fuel stabilizer, and how do I use it properly?
A fuel stabilizer is a chemical additive designed to prevent gasoline from degrading and forming gum or varnish during storage. It works by inhibiting the oxidation process that leads to fuel deterioration. Fuel stabilizers are readily available at most hardware stores and auto parts retailers.
To use a fuel stabilizer correctly, add the recommended amount to the gasoline tank according to the product instructions. Then, run the mower for a few minutes to ensure the stabilizer is thoroughly mixed with the fuel and circulates through the engine. This ensures that the entire fuel system is protected from the harmful effects of fuel degradation during storage.
Is there any risk in running the mower completely out of gas?
While running the mower out of gas is generally safe, there is a slight risk of causing damage to the carburetor. Modern carburetors are typically designed to handle occasional fuel depletion, but prolonged periods without fuel can potentially dry out the seals and gaskets. This can lead to leaks or other carburetor issues in the long run.
To mitigate this risk, you can add a small amount of fuel stabilizer to the remaining fuel before running the mower dry. This will help to lubricate the carburetor and prevent the seals from drying out completely. Alternatively, after running the engine dry, consider spraying a fogging oil into the carburetor to provide further protection.
What if I forget to run the gas out or add a fuel stabilizer before winter? What should I do in the spring?
If you forget to winterize your mower, don’t panic. The first thing you should do in the spring is inspect the fuel system. Check the fuel tank and fuel lines for any signs of gumming or varnish. If the fuel looks dirty or has a strong odor, it’s likely degraded and needs to be drained.
If the fuel is degraded, drain it completely and clean the fuel tank. You may also need to clean or replace the carburetor, depending on the severity of the gumming. After cleaning or replacing the necessary components, add fresh gasoline and try starting the mower. If it still doesn’t start, you may need to seek professional assistance.
Does this advice apply to all types of lawnmowers?
The general principles of fuel stabilization and storage apply to most gasoline-powered lawnmowers, including push mowers, riding mowers, and lawn tractors. However, there may be slight differences in the specific procedures for each type of mower. For example, riding mowers and lawn tractors often have larger fuel tanks and more complex fuel systems, so draining the fuel manually may be a more practical option than running the engine dry.
Always consult the owner’s manual for your specific lawnmower model for detailed instructions on winterizing and storing the mower. The manual may provide specific recommendations for fuel stabilization or draining procedures. Following the manufacturer’s guidelines will ensure that you properly care for your mower and prolong its lifespan.