Water in gasoline is a common problem for lawn mower owners, especially after periods of inactivity or improper storage. The presence of water can significantly impact your mower’s performance, and in severe cases, it can indeed cause serious damage. Let’s delve into the reasons why water in gas is detrimental, the signs to look for, and how to prevent and fix this issue.
Why Water and Gasoline Don’t Mix: Understanding the Chemistry
Gasoline and water are inherently incompatible. They don’t mix due to their differing chemical properties. Gasoline is a non-polar hydrocarbon, while water is a polar molecule. This difference in polarity prevents them from forming a homogeneous solution. Instead, they separate into distinct layers, with water settling at the bottom of the fuel tank due to its higher density.
This separation is the root of many problems. When your lawn mower draws fuel, it’s more likely to draw water from the bottom of the tank, especially if the water accumulation is significant.
The Impact on Combustion
Internal combustion engines, like those in lawn mowers, are designed to burn gasoline, a highly flammable substance. Water, on the other hand, is not flammable and actually inhibits combustion. When water enters the combustion chamber, it disrupts the controlled explosion that powers the engine.
This disruption leads to a variety of performance issues, including:
- Rough idling: The engine may sputter and struggle to maintain a consistent idle speed.
- Misfiring: The engine may skip or hesitate during operation.
- Reduced power: The engine may lack the power needed to effectively cut grass.
- Stalling: The engine may completely shut down, especially under load.
Corrosion and Rust: A Long-Term Threat
Beyond the immediate performance problems, water in gas can also lead to long-term damage to your lawn mower’s engine. Water is a primary catalyst for corrosion and rust, especially in the presence of metal components.
Fuel tanks, carburetors, and other engine parts are susceptible to rust when exposed to water. Rust can clog fuel lines, damage carburetor jets, and even weaken the structural integrity of the fuel tank itself. This corrosion can lead to costly repairs or even the need for a complete engine replacement.
Recognizing the Signs: Is Your Lawn Mower Suffering?
Identifying water in gas early can help you prevent significant damage. Here are some common signs that your lawn mower might be suffering from this problem:
- Difficulty Starting: One of the first and most noticeable signs is difficulty starting the engine. The water interferes with the ignition process, making it harder to get the engine running.
- Sputtering or Uneven Running: Once started, the engine might sputter, cough, or run unevenly. This is caused by the inconsistent fuel supply as the engine tries to burn both gasoline and water.
- Visible Water in the Fuel Tank: In some cases, you might be able to visually inspect the fuel tank and see a layer of water settled at the bottom. This is a clear indication of contamination.
- Rust or Corrosion: Check the fuel tank and surrounding components for signs of rust or corrosion. This indicates that water has been present for some time.
- White or Milky Appearance in the Fuel: Sometimes, the water can emulsify with the gasoline, creating a milky or cloudy appearance.
Prevention is Key: Keeping Water Out of Your Gas
Preventing water from entering your lawn mower’s fuel system is the most effective way to avoid problems. Here are some preventative measures you can take:
- Proper Fuel Storage: Store gasoline in airtight containers that are specifically designed for fuel storage. Ensure the containers are properly sealed to prevent moisture from entering. Avoid storing fuel in direct sunlight or extreme temperatures, as this can cause condensation to form inside the container.
- Use Fresh Fuel: Gasoline can degrade over time, especially when exposed to air and moisture. Purchase fresh gasoline regularly and avoid using fuel that has been stored for extended periods (more than 30 days). Consider using fuel stabilizers to extend the shelf life of gasoline.
- Fuel Stabilizers: Fuel stabilizers are additives that help prevent gasoline from degrading and absorbing moisture. Add a fuel stabilizer to your gasoline whenever you store it for more than a few weeks.
- Proper Ventilation: Store your lawn mower in a well-ventilated area to minimize condensation. Avoid storing it in damp or humid environments.
- Regular Maintenance: Perform regular maintenance on your lawn mower, including checking the fuel tank for signs of water or corrosion. Drain and clean the fuel tank periodically to remove any accumulated water or debris.
- Avoid Filling Up in Humid Conditions: Try to avoid filling up your gas can or your lawn mower’s fuel tank on very humid days. The air contains more moisture on those days, which can then condense inside the tank.
Remediation: What to Do if Water is Already Present
If you suspect that water has already contaminated your lawn mower’s fuel system, here are the steps you can take to address the problem:
- Drain the Fuel Tank: The first step is to drain the fuel tank completely. This will remove the contaminated fuel and any accumulated water. Dispose of the fuel properly according to local regulations.
- Clean the Fuel Tank: After draining the fuel tank, clean it thoroughly to remove any remaining water or debris. You can use a clean cloth or a fuel tank cleaner to scrub the inside of the tank.
- Check and Clean the Fuel Lines: Inspect the fuel lines for any signs of clogs or corrosion. If necessary, disconnect the fuel lines and clean them with compressed air or a fuel line cleaner.
- Clean the Carburetor: The carburetor is a critical component of the fuel system and is often affected by water contamination. Remove the carburetor and disassemble it carefully. Clean all the jets and passages with carburetor cleaner. Reassemble the carburetor and reinstall it on the engine.
- Replace the Fuel Filter: The fuel filter is designed to trap contaminants before they reach the engine. Replace the fuel filter to ensure that only clean fuel enters the carburetor.
- Use a Fuel Dryer Additive: After cleaning the fuel system, add a fuel dryer additive to the gasoline. These additives help to absorb any remaining water and prevent it from causing further problems.
- Refill with Fresh Fuel: Fill the fuel tank with fresh, high-quality gasoline. Consider adding a fuel stabilizer to prevent future contamination.
- Start the Engine and Monitor: Start the engine and let it run for a few minutes to allow the fresh fuel to circulate through the system. Monitor the engine for any signs of sputtering or uneven running. If the problem persists, you may need to repeat the cleaning process or seek professional assistance.
Dealing with a Severely Corroded Fuel Tank
In severe cases, the fuel tank may be so badly corroded that it needs to be replaced. If the tank is leaking or structurally damaged, replacing it is the safest and most reliable solution.
When to Seek Professional Help
If you’ve tried cleaning the fuel system and the problem persists, or if you’re not comfortable working on the engine yourself, it’s best to seek professional help from a qualified lawn mower mechanic. They have the expertise and tools to diagnose and repair more complex fuel system problems.
The Importance of Regular Maintenance
Regular maintenance is crucial for keeping your lawn mower running smoothly and preventing problems like water in gas. By following a regular maintenance schedule, you can identify potential issues early and address them before they cause significant damage.
Here are some essential maintenance tasks to include in your routine:
- Oil Changes: Change the engine oil regularly to ensure proper lubrication and prevent engine wear.
- Air Filter Cleaning: Clean or replace the air filter regularly to maintain optimal air flow to the engine.
- Spark Plug Replacement: Replace the spark plug periodically to ensure proper ignition.
- Blade Sharpening: Sharpen the lawn mower blade regularly to improve cutting performance.
- Fuel System Inspection: Inspect the fuel system for leaks, corrosion, or other problems.
By taking these preventative measures and performing regular maintenance, you can significantly reduce the risk of water in gas and keep your lawn mower running smoothly for years to come. Remember, a little prevention is worth a pound of cure when it comes to lawn mower maintenance.
While this article provides comprehensive advice, always consult your lawn mower’s owner manual for specific instructions and recommendations. Proper maintenance and care will extend the life of your lawn mower and ensure it performs optimally.
FAQ 1: What actually happens when water gets into my lawn mower’s gas tank?
Water is denser than gasoline, so it will sink to the bottom of the fuel tank. When you try to start the mower, the engine will attempt to draw fuel from the bottom of the tank, drawing in water instead of gasoline. This can lead to the engine sputtering, failing to start, or running erratically.
Furthermore, water can cause corrosion and rust within the fuel system, including the carburetor and fuel lines. This corrosion can lead to long-term damage and necessitate costly repairs, potentially shortening the lifespan of your lawn mower.
FAQ 2: How can I tell if there’s water in my lawn mower’s gas?
One of the most common signs is difficulty starting the lawn mower. It might crank, but not fully turn over or it might start, run roughly for a short period, and then die. Another indication is the engine sputtering or running inconsistently, experiencing periods of rough idling or sudden stalls.
You might also notice visual signs. Look for rust or corrosion around the fuel cap or within the fuel tank itself. Additionally, if you drain a small amount of fuel into a clear container, you might see distinct layers separating, with water settling at the bottom due to its density.
FAQ 3: Can water in the gas tank cause permanent damage to my lawn mower?
Yes, if left unaddressed, water in the gas tank can cause significant and potentially permanent damage. The corrosion and rust it causes can affect critical engine components, such as the carburetor jets, fuel lines, and even the internal engine parts if the water makes its way that far.
Continued operation with water in the fuel system will only exacerbate the problem. The engine may struggle to run efficiently, leading to increased wear and tear on its components. In severe cases, major engine repairs or even complete engine replacement might become necessary.
FAQ 4: What’s the best way to remove water from my lawn mower’s gas tank?
The most effective method is to completely drain the fuel tank. Ensure the engine is cool and disconnect the spark plug wire for safety. Then, using the fuel drain valve (if your mower has one) or by carefully tipping the mower, drain all the fuel into a suitable container.
After draining, consider adding a fuel stabilizer specifically designed to absorb water. Pour a small amount of the stabilizer into the empty tank, swirl it around to coat the interior, and then add fresh, high-quality gasoline. This helps to remove any residual water and prevent future problems.
FAQ 5: Are there any fuel additives that can help prevent water from accumulating in the gas tank?
Yes, fuel stabilizers are designed to prevent the breakdown of gasoline and also contain ingredients that help absorb moisture. These additives help prevent water from separating and settling at the bottom of the tank, where it can cause problems.
Using a fuel stabilizer regularly, especially during periods of infrequent use or when storing the lawn mower for the off-season, can significantly reduce the risk of water accumulation and its associated problems. Make sure to follow the product’s instructions for proper dosage.
FAQ 6: How does water even get into the lawn mower’s gas tank in the first place?
One common way water enters the gas tank is through condensation. Temperature fluctuations can cause moisture to condense inside the tank, especially if it’s not completely full. This is more prevalent in humid environments or during seasonal changes.
Another way water can enter is through contaminated gasoline. If the gasoline itself was exposed to water during storage or transportation, it could introduce moisture into your lawn mower’s fuel system. Additionally, rainwater can enter if the fuel cap is loose or damaged.
FAQ 7: How often should I drain the gas tank of my lawn mower, especially if I’m not using it frequently?
If you’re storing your lawn mower for more than 30 days, it’s highly recommended to drain the fuel tank. This prevents the gasoline from breaking down and forming gum or varnish, which can clog the carburetor and fuel lines.
Even if you use your lawn mower sporadically, draining the tank at the end of the mowing season is a good practice. Alternatively, using a fuel stabilizer and running the mower for a few minutes to circulate the treated fuel through the system can provide similar protection.