Last spring, my lawnmower sputtered to a stop mid-mow. I figured it was just out of gas, but after refilling, it still wouldn’t start. This got me thinking – can gas go bad in a lawn mower? This post will explore that very question, helping you understand how long gas lasts, the signs of bad gas, and how to prevent this frustrating problem from happening to you. You’ll learn how to extend the life of your fuel, troubleshoot starting issues, and save money on repairs and replacement fuel.
Gasoline Storage and Degradation
This section examines how gasoline deteriorates over time and the factors that influence its lifespan. Understanding these factors will help you take preventative measures and avoid problems with your lawnmower.
Factors Affecting Gasoline Quality
- Exposure to Air: Gasoline is highly volatile and reacts with oxygen in the air. This oxidation process creates gums and varnishes that clog fuel systems. The longer gas is exposed to air, the faster it degrades. Properly sealing your fuel container is crucial.
- Temperature Fluctuations: Extreme temperatures, both hot and cold, accelerate the degradation process. Heat speeds up chemical reactions, while cold can cause condensation that contaminates the fuel. Storing gasoline in a stable temperature environment is recommended.
- Ethanol Content: Most gasoline sold today contains ethanol, which attracts water. Water in your fuel tank can cause corrosion and damage to your engine’s components. The higher the ethanol content, the shorter the shelf life of the fuel.
How Long Does Gasoline Last?
The shelf life of gasoline depends heavily on storage conditions. Under ideal conditions (cool, dark, airtight container), gasoline can remain usable for up to 3 months. However, in less ideal conditions, this time can be significantly reduced.
- 3 Months (Ideal Conditions): Cool, dark, airtight container. Minimal exposure to air and temperature fluctuations.
- 1-2 Months (Typical Conditions): Stored in a somewhat airtight container, exposed to moderate temperatures and some air.
- Less than 1 Month (Poor Conditions): Exposed to sunlight, high temperatures, or stored in a poorly sealed container.
Signs of Bad Gas in a Lawn Mower
This section details the common indicators that your lawn mower’s fuel has gone bad, helping you diagnose the problem and avoid unnecessary repairs.
Difficulty Starting
One of the most common signs of bad gas is difficulty starting your lawn mower. The degraded fuel may not ignite properly, leading to sputtering, hesitation, or failure to start entirely.
- Engine sputtering: The engine may try to start, but only sputters and coughs before dying.
- Hesitation or uneven running: The engine might run, but not smoothly. You might experience stalling or irregular speed.
- No start at all: In some cases, the engine won’t start at all due to the fuel being completely unusable.
Poor Engine Performance
Even if the engine starts, bad gasoline can severely impact its performance. You may notice reduced power, poor acceleration, and overall inefficiency.
- Reduced power: The mower may struggle to cut thick grass or climb inclines.
- Poor acceleration: The engine may take longer to respond to the throttle.
- Increased fuel consumption: Your mower may use more gas than usual due to inefficient combustion.
Fuel System Issues
Over time, bad gasoline can leave behind deposits and residues that clog the fuel filter, carburetor, or fuel lines. This can lead to a range of problems, from poor performance to complete engine failure.
- Clogged fuel filter: This will restrict fuel flow to the engine, resulting in poor performance or no start.
- Clogged carburetor: The carburetor is a crucial part of the fuel system; a clogged carburetor will prevent proper fuel-air mixing, making the engine run poorly or fail to start.
- Damaged fuel lines: The degraded fuel can damage the rubber fuel lines over time leading to leaks and further problems.
Preventing Bad Gas in Your Lawn Mower
This section provides practical tips and strategies for extending the life of your gasoline and avoiding the problems associated with degraded fuel.
Using Fuel Stabilizers
Fuel stabilizers are additives designed to prevent the deterioration of gasoline by reducing oxidation and water absorption. They can significantly extend the shelf life of gasoline, allowing you to keep a small supply on hand without worrying about it going bad.
- Extended shelf life: Fuel stabilizers can extend the usable life of gasoline by several months, even under less-than-ideal storage conditions.
- Improved engine performance: By preventing gum and varnish formation, fuel stabilizers can help maintain the optimal performance of your engine.
- Reduced maintenance: By keeping your fuel system clean, fuel stabilizers help reduce the frequency of maintenance and repairs.
Proper Fuel Storage
Storing gasoline correctly is crucial to preventing its degradation. This involves using appropriate containers, storing them in a cool, dry place, and avoiding exposure to sunlight and extreme temperatures.
- Use approved containers: Use only containers specifically designed for storing gasoline, typically made of metal or plastic approved for fuel storage.
- Keep it cool and dry: Store gasoline in a cool, dark, and well-ventilated area away from ignition sources.
- Keep it sealed: Ensure the container is tightly sealed to prevent evaporation and exposure to air.
Regularly Emptying the Fuel Tank
If you won’t be using your lawnmower for an extended period, it’s best to empty the fuel tank to prevent gasoline from degrading and causing problems. This is particularly important if you live in an area with fluctuating temperatures.
- Drain the tank completely: Use a siphon pump or carefully drain the fuel tank into a suitable container.
- Dispose of fuel properly: Never pour gasoline down a drain or into the ground. Take it to a local recycling center or auto parts store for proper disposal.
- Clean the tank (if necessary): After draining, consider cleaning the tank to remove any residue or debris that may have accumulated.
Troubleshooting Lawn Mower Starting Issues
This section focuses on practical steps for diagnosing and resolving common starting problems that may be related to bad gasoline.
Inspecting the Fuel System
Start by visually inspecting the fuel system for any obvious signs of problems, such as leaks, clogs, or damage. This can provide valuable clues about the source of the starting difficulties.
- Check the fuel lines: Examine the fuel lines for cracks, kinks, or other damage. Replace any damaged lines.
- Inspect the fuel filter: Check if the fuel filter is clogged. Replace it if necessary.
- Examine the carburetor: If you have experience, you may inspect the carburetor for clogs or debris. If you are not comfortable with this, take your mower to a professional.
Draining and Refilling with Fresh Gasoline
If you suspect the gas is bad, the easiest solution is to drain the old fuel and refill the tank with fresh, high-quality gasoline. This is a simple fix that can often resolve starting issues.
- Drain the tank completely: Use a siphon pump or carefully drain the fuel tank into a suitable container.
- Add fresh fuel: Fill the tank with fresh, high-quality gasoline.
- Try starting the engine: Attempt to start the lawnmower to see if the problem is resolved.
Seeking Professional Help
If you’ve tried the above steps and your lawnmower still won’t start, it’s time to seek professional help. A qualified mechanic can diagnose and repair more complex problems related to the fuel system or other engine components.
FAQ
Can I use old gas from my car in my lawnmower?
It’s generally not recommended. Car fuel often contains additives that may not be suitable for a lawnmower engine. It’s best to use fresh, small-engine gasoline specifically designed for lawnmowers.
How do I dispose of old gasoline properly?
Never pour old gasoline down the drain or onto the ground. Contact your local waste management facility or a recycling center for instructions on proper disposal methods. Many auto parts stores also accept used motor oil and gasoline.
My lawnmower is hard to start, but it runs once it’s going. Is it bad gas?
It could be. Hard starting can be a sign of bad gas, especially if the engine runs poorly or inconsistently once it’s started. However, other factors could also be involved, so further investigation is warranted.
What are the signs of a clogged fuel filter?
A clogged fuel filter will usually lead to difficulty starting, poor engine performance, and potentially sputtering or stalling. It may also affect the engine’s ability to reach full speed.
How often should I change the gas in my lawn mower?
It’s best to use fresh gasoline for every mowing session. If you won’t use it for a few months, use a fuel stabilizer or drain the tank to prevent gasoline from going bad.
What happens if I use bad gas in my lawn mower?
Using bad gas can cause a variety of issues, including difficulty starting, poor engine performance, clogged fuel lines, carburetor damage, and ultimately, significant engine damage requiring costly repairs.
Can I store gasoline in a plastic container?
Only use plastic containers specifically designed and labeled for gasoline storage. Improper containers may crack or leak, posing a safety hazard. Metal containers are generally preferred.
Final Thoughts
Understanding whether can gas go bad in a lawn mower is crucial for maintaining your equipment. By following the tips provided in this guide – using fuel stabilizers, storing fuel properly, and regularly checking for signs of bad gas – you can significantly extend the lifespan of your gasoline and avoid costly repairs. Remember, preventative maintenance is key to keeping your lawn mower running smoothly and efficiently for years to come. Don’t hesitate to address any fuel-related issues promptly to prevent more serious problems down the line.
