A clean lawn mower gas tank is crucial for optimal performance and longevity. Over time, old fuel can degrade, leaving behind varnish, sediment, and rust that can clog fuel lines, carburetors, and ultimately damage your engine. Cleaning the tank isn’t difficult, but it requires some preparation and attention to detail. This guide will walk you through the process, ensuring your lawn mower runs smoothly for years to come.
Why Cleaning Your Lawn Mower Gas Tank is Important
Ignoring a dirty gas tank can lead to a host of problems. Old fuel breaks down, forming a gummy residue that sticks to the tank’s walls and floor. This residue can then contaminate fresh fuel, leading to poor combustion, difficulty starting, and reduced power. Rust can also form inside the tank, especially if it’s made of metal. These rust particles can break loose and clog the fuel filter and carburetor jets, causing further performance issues.
A clean gas tank translates to improved fuel efficiency, easier starting, and a longer lifespan for your lawn mower engine. Regular cleaning, especially after seasonal storage, is an investment in your lawn mower’s health.
Preparing to Clean Your Lawn Mower Gas Tank
Before you start, gather the necessary tools and supplies and ensure a safe working environment. Safety should always be your top priority.
Gathering Your Supplies
You’ll need a few key items to effectively clean your lawn mower gas tank:
- Safety Glasses: Protect your eyes from fuel and debris.
- Gloves: Protect your hands from chemicals and grime. Nitrile gloves are a good option.
- Fuel Stabilizer: To add to the new fuel after cleaning.
- Gas Can: To safely store old fuel.
- Funnel: For pouring fuel.
- Shop Rags: For cleaning up spills and wiping down parts.
- Screwdrivers (various sizes): To remove the gas tank.
- Wrench (if needed): For disconnecting fuel lines.
- Cleaning Solution: Choose from options like carburetor cleaner, degreaser, or a mixture of water and dish soap.
- Small Brush: A long-handled brush or bottle brush is useful for scrubbing inside the tank.
- Flashlight: To inspect the inside of the tank.
- Paper Towels: For drying components.
- Rust Remover (optional): If you find significant rust.
Safety First: Preparing Your Workspace
Work in a well-ventilated area, preferably outdoors. Gasoline fumes are flammable and can be harmful if inhaled. Avoid open flames, sparks, or smoking while working with fuel. Place a drop cloth or old newspapers beneath the lawn mower to catch any spills. Disconnect the spark plug wire to prevent accidental starting.
Step-by-Step Guide to Cleaning Your Lawn Mower Gas Tank
Now that you’ve gathered your supplies and prepared your workspace, follow these steps to clean your lawn mower gas tank:
1. Draining the Old Fuel
This is the first and most important step. Never attempt to clean the tank while it’s full of gasoline.
- If there’s fuel in the tank, use a siphon pump or carefully pour it into an approved gas can.
- Dispose of the old fuel properly. Check your local regulations for fuel disposal.
- Alternatively, you can use the old fuel (if relatively clean) in another gasoline-powered device like a car or truck if it’s not heavily contaminated.
2. Removing the Gas Tank
Carefully disconnect the gas tank from the lawn mower.
- Locate the fuel line connecting the tank to the carburetor. Use a wrench or pliers to disconnect it, if necessary.
- Some lawn mowers have a shut-off valve on the fuel line. Close this valve before disconnecting the line to prevent fuel from leaking.
- Remove any screws or bolts securing the gas tank to the mower.
- Gently lift the tank away from the mower.
3. Inspecting the Tank
Before you start cleaning, take a good look inside the tank.
- Use a flashlight to inspect the interior for rust, sediment, and varnish.
- Assess the level of contamination to determine the best cleaning approach.
- If the tank is heavily rusted, you might consider using a rust remover.
4. Cleaning the Tank
There are several methods for cleaning the inside of the gas tank. Choose the one that best suits the level of contamination.
Cleaning with Soap and Water
For lightly contaminated tanks, a simple solution of soap and water can be effective.
- Mix warm water with a few drops of dish soap.
- Pour the solution into the gas tank.
- Shake the tank vigorously to loosen any debris.
- Use a long-handled brush or bottle brush to scrub the inside of the tank.
- Rinse the tank thoroughly with clean water until all traces of soap are gone.
- Allow the tank to dry completely before reinstalling it.
Cleaning with Carburetor Cleaner or Degreaser
For tanks with more stubborn deposits, carburetor cleaner or degreaser is a better option.
- Follow the instructions on the product label.
- Typically, you’ll spray the cleaner into the tank and let it sit for a few minutes to dissolve the deposits.
- Use a brush to scrub the inside of the tank.
- Rinse the tank thoroughly with clean water.
- Allow the tank to dry completely.
Using a Rust Remover
If the tank is heavily rusted, you’ll need to use a rust remover.
- Follow the instructions on the rust remover product label.
- Some rust removers require soaking the tank for several hours or even overnight.
- After using the rust remover, rinse the tank thoroughly with clean water.
- Consider using a fuel tank sealer to prevent future rust formation.
Using Vinegar
Vinegar is a natural and effective rust remover.
- Fill the tank with white vinegar.
- Let it soak for 24-48 hours.
- Shake the tank periodically.
- Rinse thoroughly with water.
- Dry completely.
5. Drying the Tank
It’s crucial to ensure the tank is completely dry before reinstalling it. Water can cause rust and corrosion, undoing your cleaning efforts.
- Allow the tank to air dry in a well-ventilated area.
- You can use a clean cloth or paper towels to wipe out any remaining moisture.
- A hairdryer on a low setting can help speed up the drying process.
6. Reinstalling the Gas Tank
Once the tank is completely dry, you can reinstall it on the lawn mower.
- Reconnect the fuel line to the carburetor.
- Secure the tank with the screws or bolts you removed earlier.
- Ensure all connections are tight and secure.
7. Adding Fresh Fuel and Fuel Stabilizer
Now it’s time to add fresh fuel to the tank.
- Use a funnel to pour the fuel into the tank.
- Add a fuel stabilizer to the fuel to prevent it from degrading. Fuel stabilizer is especially important if you plan to store the lawn mower for an extended period.
- Reconnect the spark plug wire.
Preventing Future Buildup
Taking preventive measures can significantly reduce the need for frequent gas tank cleanings.
- Use Fuel Stabilizer: Always add fuel stabilizer to your gasoline, especially before storing your lawn mower for the off-season. This will prevent the fuel from breaking down and forming deposits.
- Drain the Fuel Tank: If you’re storing your lawn mower for a long period, drain the fuel tank completely.
- Use Fresh Fuel: Avoid using old or stale gasoline. Fresh fuel burns cleaner and is less likely to cause problems.
- Regular Maintenance: Perform regular maintenance on your lawn mower, including changing the air filter and spark plug.
- Consider Ethanol-Free Fuel: Ethanol-free fuel can help prevent moisture absorption and fuel degradation.
Troubleshooting Common Issues
Even after cleaning your gas tank, you might encounter some issues. Here are a few common problems and how to address them:
- Lawn mower still won’t start: Check the spark plug, fuel filter, and carburetor. They may need cleaning or replacement.
- Lawn mower runs rough: The carburetor may need adjusting or cleaning.
- Fuel leaks: Check the fuel lines and connections for leaks. Replace any damaged parts.
Choosing the Right Cleaning Solution
Selecting the appropriate cleaning solution depends on the severity of the contamination and the type of material the gas tank is made from.
- Soap and Water: Suitable for light contamination and general cleaning. Safe for all types of tanks.
- Carburetor Cleaner: Effective for dissolving varnish and gum deposits. Use with caution on plastic tanks, as it can damage some plastics.
- Degreaser: Good for removing oily residues. Similar precautions to carburetor cleaner.
- Rust Remover: Necessary for heavily rusted tanks. Follow the product instructions carefully and consider using a fuel tank sealer afterward.
- Vinegar: A natural alternative for rust removal. Safe and effective, but may require a longer soaking time.
When to Seek Professional Help
While cleaning a lawn mower gas tank is a manageable task for most homeowners, there are situations where professional help is recommended.
- Heavily Rusted Tank: If the tank is severely rusted, professional cleaning or replacement might be necessary.
- Damaged Tank: If the tank is cracked or damaged, it should be replaced.
- Carburetor Issues: If you’re not comfortable working on the carburetor, seek professional assistance.
- Complex Engine Problems: If you’ve cleaned the gas tank and are still experiencing engine problems, it’s best to consult a qualified mechanic.
By following these steps and taking preventive measures, you can keep your lawn mower gas tank clean and your engine running smoothly. Remember to prioritize safety and take your time to ensure a thorough cleaning.
Why is it important to clean the gas tank of my lawn mower?
Cleaning the inside of your lawn mower’s gas tank is crucial for maintaining its optimal performance. Over time, old fuel can degrade and leave behind deposits like varnish, gum, and rust particles. These contaminants can clog fuel lines, carburetor jets, and filters, leading to starting problems, reduced power, and even engine damage. Ignoring this buildup can significantly shorten the lifespan of your lawn mower and result in costly repairs.
A clean gas tank ensures a steady and consistent fuel supply to the engine. This, in turn, leads to smoother operation, improved fuel efficiency, and easier starting, especially after periods of storage. Regular cleaning, as part of your lawn mower’s maintenance routine, helps prevent these issues and keeps your machine running reliably for years to come. It’s a simple task that can save you a lot of headaches in the long run.
How often should I clean my lawn mower’s gas tank?
The frequency of cleaning your lawn mower’s gas tank largely depends on how often you use it and the quality of fuel you use. Generally, it’s recommended to clean the tank at least once a year, ideally before storing the lawn mower for the off-season (winter). If you notice signs of fuel degradation, such as difficulty starting, rough idling, or reduced power, it’s a good idea to inspect and clean the tank even if it hasn’t been a full year.
If you frequently leave fuel in the tank for extended periods or use gasoline that contains ethanol, which attracts moisture and can accelerate the formation of deposits, you may need to clean the tank more frequently, perhaps every six months. Using a fuel stabilizer can help prevent fuel degradation and extend the intervals between cleanings. Consistent use of fresh fuel is also a beneficial practice.
What tools and materials do I need to clean the gas tank?
To effectively clean your lawn mower’s gas tank, you’ll need a few essential tools and materials. First, you’ll require safety glasses and gloves to protect yourself from fuel and debris. You’ll also need a siphon or fuel pump to remove the old fuel, a container to store the fuel, and a wrench or socket set to detach the fuel tank from the mower.
For the actual cleaning, you’ll need a suitable cleaning solution, such as a commercial fuel tank cleaner or a mixture of warm water and dish soap. You may also need a long-handled brush, a shop towel, or even a handful of clean nuts or bolts to help dislodge stubborn deposits. Finally, have some fresh fuel and a fuel filter (if applicable) ready to replace the old components once the tank is clean and dry.
Can I use gasoline to clean the gas tank?
While gasoline might seem like a convenient cleaner since it’s readily available, it’s generally not recommended for cleaning your lawn mower’s gas tank. Gasoline itself can contribute to the buildup of deposits over time. Also, using gasoline as a cleaner presents significant safety risks due to its highly flammable nature.
Instead of gasoline, opt for a dedicated fuel tank cleaner or a safer alternative like warm, soapy water. These cleaners are specifically designed to dissolve fuel residue and varnish without posing the same flammability hazards. Remember to thoroughly rinse the tank after cleaning with soapy water to remove any soap residue before refilling it with fresh fuel.
How do I dispose of the old fuel safely?
Proper disposal of old fuel is essential for environmental protection and safety. Never pour old gasoline down the drain, onto the ground, or into a storm sewer, as this can contaminate soil and water sources. Instead, check with your local waste management authorities for designated collection sites or hazardous waste disposal programs.
Many communities offer specific days or locations for collecting household hazardous waste, including gasoline. You can also contact local auto parts stores or service stations, as some may accept used fuel for recycling or proper disposal. Always store the old fuel in a tightly sealed, properly labeled container until you can dispose of it responsibly and in accordance with local regulations.
What if I can’t remove the gas tank from the lawn mower?
If you’re unable to remove the gas tank from your lawn mower due to its design or rust issues, you can still clean it effectively in place. First, siphon out as much of the old fuel as possible. Then, carefully introduce your cleaning solution into the tank, ensuring it reaches all areas. You may need to gently rock the mower or use a flexible tube to agitate the solution.
After allowing the solution to soak for a while, siphon it out as well, and repeat the process several times until the drained solution is clear. Finally, add a small amount of fresh fuel to the tank and swish it around to absorb any remaining moisture or residue. Siphon out the fresh fuel, and let the tank air dry thoroughly before refilling it completely. Consider using a fuel stabilizer to prevent future buildup.
What are some signs that my gas tank needs cleaning?
Several telltale signs indicate that your lawn mower’s gas tank needs cleaning. One of the most common symptoms is difficulty starting the engine, especially after the mower has been sitting idle for a while. You may also notice the engine running roughly, sputtering, or lacking power, particularly under load. These issues often stem from clogged fuel lines or carburetor jets caused by contaminants from the tank.
Another sign is visible rust or debris inside the tank when you inspect it. If the fuel filter is frequently clogged or discolored, it suggests that the gas tank is likely contributing to the problem. Additionally, if you notice a strong, stale odor emanating from the fuel tank, it’s a clear indication that the fuel has degraded and the tank needs cleaning to restore optimal performance and prevent further engine problems.