How to Clean Gas Tank on Lawn Mower

To clean the gas tank on a lawn mower, empty the tank, remove any debris, flush with clean fuel and reinstall. Now you can enjoy a clean and efficient lawn mower.

Text Example

Must-Have Cleaning Essentials For Every Home (Recommended):

Calyptus 45% Pure Super Concentrated Vinegar | Dilutes to 18 Gallons | 9x Power Concentrate Vinegar | 2 Gallons
  • Consistently delivers the same smell, color, and results - every time. For superior and safer cleaning performance, in and around your home.
Baking Soda
Milliard 5lbs Baking Soda / Sodium Bicarbonate USP - 5 Pound Bulk Resealable Bag
  • Great household product for anything that needs a bright new look! Use it as a cleansing booster with your laundry or dish detergent, as a pH buffer in swimming pools, or for cleaning kitchen surfaces.
Microfiber Cleaning Cloth
MR.SIGA Microfiber Cleaning Cloth, Pack of 12, Size:12.6
  • Ultra-soft, highly absorbent, durable, lightweight, non-abrasive microfiber cleaning cloths. Great for cleaning windows, kitchenware, cars, bathrooms, mirrors, or other delicate surfaces. Perfect dish rags that don't smell.
This post may have affiliate links and as an Amazon Associate we earn from qualifying purchases.

Having a clean gas tank is essential for optimal performance and longevity of your lawn mower. Over time, dirt, debris, and sediment can accumulate in the tank, resulting in clogged fuel lines and reduced engine efficiency. Regularly cleaning the gas tank helps to maintain your lawn mower’s functionality and ensures a clean fuel supply.

We will provide you with a simple step-by-step guide on how to clean the gas tank on your lawn mower, allowing you to keep your equipment in top-notch condition.

1. Signs Of A Dirty Gas Tank

A dirty gas tank can significantly affect the performance and efficiency of your lawn mower. Over time, debris, sediment, and old fuel can accumulate in the gas tank, leading to various problems that can hinder your mower’s performance. By being aware of the signs indicating a dirty gas tank, you can address the issue promptly and ensure your lawn mower runs smoothly. Below are a few key signs to look out for:

Difficulty Starting The Lawn Mower

A dirty gas tank can make starting your lawn mower a frustrating and time-consuming task. When debris and sediment clog the fuel line or the carburetor in the gas tank, it restricts the flow of fuel to the engine. As a result, the engine may struggle to start or not start at all. If you find yourself pulling the starter cord repeatedly or using starting fluid more frequently, it’s likely an indication of a dirty gas tank that needs cleaning.

Engine Stalling Or Running Rough

An engine that stalls frequently or runs rough and unevenly is another telltale sign of a dirty gas tank. When debris accumulates in the fuel tank, it can find its way into the engine, clogging the fuel lines or getting stuck in the carburetor. This restricted fuel flow can cause the engine to stall or run erratically, resulting in a choppy and unreliable performance. If you notice your lawn mower’s engine stuttering, stalling, or producing strange noises, it’s time to investigate and clean the gas tank.

Fuel Filter Becoming Clogged

A dirty gas tank often leads to a clogged fuel filter. The fuel filter is responsible for trapping debris and impurities before they reach the engine. However, when the gas tank is dirty, sediment and contaminants can accumulate and clog the fuel filter quickly. A clogged fuel filter can hinder the proper flow of fuel, resulting in inadequate fuel supply to the engine. If you notice that the fuel filter requires frequent replacement or your lawn mower is experiencing fuel-related problems, it’s a strong indication of a dirty gas tank that needs attention.

Decreased Engine Performance

Finally, a dirty gas tank can cause a significant decrease in engine performance. As debris, sediment, and old fuel accumulate in the gas tank, they can mix with fresh fuel, diluting its potency. This dilution can affect the fuel-to-air ratio, resulting in incomplete combustion and reduced engine power. If you notice that your lawn mower is not operating at its optimal capacity, struggles to cut grass efficiently, or exhibits reduced overall performance, it’s highly likely that a dirty gas tank is to blame.

2. Preparing For Gas Tank Cleaning

Before you start cleaning the gas tank on your lawn mower, it’s important to gather the necessary tools and materials.

Gather Necessary Tools And Materials

To ensure a smooth and efficient cleaning process, gather the following items:

  • Safety gloves: Protective gloves will keep your hands safe from any harmful chemicals or debris.
  • Socket wrench: This tool will be needed to disconnect the gas tank and remove it from the lawn mower.
  • Clean cloth: A soft cloth will come in handy for wiping surfaces and removing any dirt or residue.
  • Gas can: You will need a gas can to safely drain and store the remaining fuel in the gas tank.
  • Fuel stabilizer (optional): If your lawn mower has old fuel or you want to prevent future fuel-related issues, using a fuel stabilizer can be beneficial.
  • Cleaner solution: Depending on the condition of your gas tank, you may need a cleaner solution specifically designed for removing rust, debris, or other contaminants.

Turn Off The Lawn Mower And Remove The Spark Plug

Prior to cleaning the gas tank, it’s crucial to ensure the safety of the process. Here’s what you need to do:

  1. Turn off the lawn mower: Locate the on/off switch and turn off the lawn mower completely.
  2. Remove the spark plug: By disconnecting the spark plug, you eliminate the risk of accidental ignition. Unscrew the spark plug using a socket wrench, carefully detach the wire, and set it aside in a safe place.

Safely Drain The Remaining Fuel From The Gas Tank

Before proceeding with the cleaning, you’ll need to drain the fuel from the gas tank:

  1. Locate the gas tank: Depending on the model of your lawn mower, the gas tank can usually be found either on the top or the side of the mower.
  2. Disconnect the gas line: Use a socket wrench to loosen the clamp securing the gas line to the tank, and carefully detach the line.
  3. Prepare the gas can: Position the gas can below the gas tank to catch the fuel while draining. Make sure the gas can is clean and free from any contaminants.
  4. Drain the fuel: Tilt the lawn mower, allowing the fuel to flow from the gas tank into the gas can. Allow all the fuel to drain completely.

Disconnect The Gas Line And Remove The Gas Tank

To access and clean the gas tank properly, you’ll need to disconnect it from the lawn mower:

  1. Disconnect the gas line: Carefully remove the gas line from the gas tank, ensuring that no fuel spills occur. Use a clean cloth to wipe away any fuel residue.
  2. Remove the gas tank: Using a socket wrench, loosen and remove the screws or bolts that hold the gas tank in place. Lift the tank away from the lawn mower and set it aside.

3. Removing Dirt And Debris

When it comes to maintaining your lawn mower, cleaning the gas tank is an essential task that should not be overlooked. Over time, dirt, debris, and rust can accumulate inside the gas tank, leading to clogged fuel lines and poor engine performance. In this section, we will take you through the necessary steps to remove dirt and debris from your lawn mower’s gas tank, ensuring a clean and efficient fuel system.

H3inspect The Gas Tank For Dirt, Debris, And Rust/h3

The first step in cleaning your lawn mower’s gas tank is to inspect it for any dirt, debris, or rust that may have accumulated over time. Use a flashlight to get a clear view of the interior of the tank. Look for any visible signs of dirt or debris, such as sediment or particles floating in the fuel. Additionally, check for any rust spots or corrosion on the tank’s walls. If you notice any of these issues, it’s important to address them before proceeding with the cleaning process.

H3thoroughly Clean The Gas Tank Exterior/h3

Before tackling the interior of the gas tank, it’s crucial to give the exterior a thorough cleaning. Start by removing the gas tank from the lawn mower, following the manufacturer’s instructions. Once removed, use a soft cloth or sponge soaked in warm soapy water to wipe down the exterior of the tank. Pay close attention to areas where dirt and grime might have accumulated, such as the cap and the fuel outlet. Rinse the tank with clean water and dry it completely before moving on to the next step.

H3use A Fuel System Cleaner To Dissolve Built-up Deposits/h3

Now it’s time to tackle the interior of the gas tank. In order to dissolve any built-up deposits and debris, we recommend using a fuel system cleaner. These cleaners are specifically designed to break down and remove harmful deposits that can hinder your lawn mower’s performance. Follow the manufacturer’s instructions on the fuel system cleaner bottle to ensure you use the correct amount. Pour the cleaner into the gas tank and swish it around gently to cover all surfaces. Let it sit for the recommended amount of time to allow the cleaner to work its magic.

H3rinse The Gas Tank With Water To Remove Loosened Debris/h3

After the fuel system cleaner has had enough time to dissolve deposits, it’s time to rinse the gas tank thoroughly. Use a hose or a bucket of clean water to flush out the tank. Pour the water into the tank and swish it around, ensuring it reaches all corners. This will help wash away any loosened debris and residue left behind by the fuel system cleaner. After rinsing, carefully pour out the water and ensure that no debris remains inside the tank. Keep rinsing until the water runs clear and there are no signs of debris.

By following these steps to remove dirt and debris from your lawn mower’s gas tank, you can ensure that your fuel system remains clean and efficient. Regular maintenance and cleaning will extend the life of your lawn mower and keep it performing at its best, allowing you to maintain a beautifully manicured lawn with ease.

4. Cleaning The Fuel System

To clean the gas tank on your lawn mower, it is essential to follow a systematic approach to cleaning the fuel system. By carefully performing this task, you can ensure optimal performance and longevity of your equipment.

Chapter 4: Cleaning The Fuel System

When it comes to maintaining your lawn mower, cleaning the fuel system is an essential task that ensures the smooth operation of your machine. Over time, debris and particles can accumulate in the fuel system, leading to clogs and poor performance. In this section, we will discuss the key steps to effectively clean the fuel system and keep your lawn mower running efficiently.

Inspect The Fuel Filter For Clogs And Replace If Necessary

The fuel filter plays a crucial role in keeping your lawn mower’s engine clean by filtering out impurities from the fuel. However, over time, the filter can become clogged with dirt and debris, affecting fuel flow and engine performance. To inspect the fuel filter, follow these steps:

  1. Locate the fuel filter, which is usually positioned between the fuel tank and the carburetor.
  2. Carefully remove the fuel filter, taking note of its position and direction of flow.
  3. Examine the filter for any signs of clogging or discoloration. If it appears dirty or clogged, it is advisable to replace it with a new filter.
  4. Install the new filter by reversing the removal process, ensuring it is securely positioned and aligned with the directional flow.

Regularly inspecting and replacing the fuel filter will help prevent fuel flow issues and maintain optimal engine performance.

Clean Or Replace The Fuel Pump If Needed

The fuel pump is another critical component of the fuel system that ensures the proper supply of fuel to the carburetor. Over time, it can become clogged or damaged, leading to fuel delivery problems and engine issues. Follow these steps to clean or replace the fuel pump:

  1. Locate the fuel pump, which is typically positioned between the fuel tank and the carburetor.
  2. If the fuel pump is externally mounted, carefully detach it from its mounting bracket using the appropriate tools.
  3. Inspect the fuel pump for any signs of clogs, damage, or wear. If it is dirty or damaged beyond repair, it is recommended to replace it with a new pump.
  4. If the fuel pump is internally located within the carburetor, refer to your lawn mower’s manual for specific instructions on how to clean or replace it.
  5. Once the pump is cleaned or replaced, reassemble it according to the manufacturer’s instructions and ensure it is securely mounted.

Regular maintenance of the fuel pump is essential for proper fuel flow and engine longevity.

Use A Brush Or Compressed Air To Clean The Carburetor

The carburetor is responsible for mixing fuel and air to create the combustible mixture that powers your lawn mower. Over time, it can accumulate residue, varnish, and other deposits that can hinder its performance. Follow these steps to clean the carburetor:

  1. Locate the carburetor, which is usually attached to the side of the engine.
  2. Using a brush or compressed air, carefully remove any visible dirt or debris from the carburetor’s exterior.
  3. Disassemble the carburetor according to the manufacturer’s instructions, taking care to document the order of parts and their positions for reassembly.
  4. Clean the individual components of the carburetor using a carburetor cleaner and a brush.
  5. Inspect the small passages and jets for any signs of clogs, using a fine wire or a needle to clear any obstructions.
  6. Once all the components are thoroughly cleaned and cleared of debris, reassemble the carburetor in the reverse order, ensuring each part is properly positioned.

Cleaning the carburetor regularly will help maintain proper fuel mixture and ensure optimal engine performance.

Flush The Fuel Lines To Remove Any Remaining Debris

Even after cleaning the fuel filter, pump, and carburetor, there may still be residual debris in the fuel lines. Flushing the fuel lines will help eliminate any remaining particles and ensure smooth fuel flow. Follow these steps to flush the fuel lines:

  1. Locate the fuel lines, which connect the fuel tank to the carburetor.
  2. Disconnect the fuel lines from both the fuel tank and the carburetor, ensuring a catch pan is in place to collect any fuel spills.
  3. Using compressed air or a designated fuel line flush kit, blow air or cleaner through the fuel lines in the opposite direction of fuel flow.
  4. Continue flushing until clear fluid or air is expelled from the lines, indicating that all debris has been removed.
  5. Reconnect the fuel lines securely to the fuel tank and the carburetor.

Regularly flushing the fuel lines will help prevent clogs and ensure uninterrupted fuel flow to the engine.

5. Reassembling And Refilling

To clean the gas tank on your lawn mower, start by reassembling and refilling it. This process helps ensure that your mower runs smoothly and efficiently, allowing for optimal performance and a lush, well-maintained lawn.

Reinstall The Gas Tank And Reconnect The Gas Line

Once you have thoroughly cleaned the gas tank of your lawn mower, it’s time to reassemble everything and get it ready for action. Start by reattaching the gas tank to the lawn mower. Make sure it is securely fastened in its proper place. Then, locate the gas line that was disconnected earlier and reconnect it to the gas tank.

Fill The Gas Tank With Fresh, Clean Fuel

With the gas tank securely reinstalled, it’s time to fill it up with fresh, clean fuel. Make sure you have a container of gasoline that is clean and free of any debris. Before pouring the fuel, check for the proper fuel-to-oil ratio recommended by the manufacturer. Take your time while pouring the fuel to avoid any spills or overflows. It’s always a good idea to use a funnel to pour the fuel, as it reduces the risk of spillage.

Reattach The Spark Plug And Start The Lawn Mower

With the gas tank filled with fresh fuel, it’s time to reattach the spark plug to its socket. Make sure it is connected securely but avoid overtightening. Once the spark plug is in place, give it a quick inspection to ensure there is no visible damage. Now, it’s time to start up your lawn mower and test it to see if it’s working properly.

Test The Lawn Mower For Proper Functioning

Start your lawn mower and let it run for a few minutes to ensure it starts smoothly and without any issues. Listen for any unusual noises or vibrations that may indicate a problem. Engage the blades and check if they are spinning correctly. Test the mower on different terrains and angles to ensure it is functioning properly. If everything seems to be working fine, you can proceed to the final step.

Tips For Maintaining A Clean Gas Tank And Preventing Future Issues

  1. Regularly clean the gas tank of your lawn mower to prevent debris and sediments from causing clogs.
  2. Consider using a fuel stabilizer to keep the fuel fresh and prevent it from deteriorating over time.
  3. Store your lawn mower in a clean and dry area to prevent moisture and rust from affecting the gas tank.
  4. Check for any signs of damage or leaks in the gas tank and address them immediately to prevent further issues.
  5. Follow the manufacturer’s recommendations for fuel type and fuel-to-oil ratio to ensure optimal performance of your lawn mower.

By following these tips and regularly maintaining your lawn mower’s gas tank, you can ensure its longevity and keep it running smoothly for years to come.

How To Clean Gas Tank On Lawn Mower


Frequently Asked Questions On How To Clean Gas Tank On Lawn Mower

What Is The Best Way To Clean The Inside Of A Gas Tank?

The best way to clean the inside of a gas tank is by using a specialized cleaner and fuel additive. Add the cleaner to the tank, then fill it with fuel and let the mixture sit for a few hours.

After that, start the engine and drive around to help clean the tank’s interior.

How Do You Flush Gas Out Of A Lawn Mower?

To flush gas out of a lawn mower, first, turn off the engine and disconnect the spark plug wire. Then, empty the fuel tank by either siphoning or removing the drain plug. Next, remove and clean the spark plug. Finally, refill the tank with fresh gasoline and reconnect the spark plug wire.

Can I Put Carb Cleaner In My Lawn Mower Gas Tank?

No, it’s not recommended to put carb cleaner in your lawn mower gas tank. It can damage the engine and other components. It’s best to use the appropriate fuel and follow the manufacturer’s instructions for maintenance and cleaning.

What Are The Symptoms Of Bad Gas In A Lawn Mower?

Symptoms of bad gas in a lawn mower are hard starting, engine stalling, sputtering, and running rough.


To ensure a smooth and efficient operation of your lawn mower, cleaning the gas tank is essential. By following the step-by-step process outlined in this guide, you can remove any dirt, debris, or old fuel that may be clogging the tank.

Regular maintenance of your lawn mower’s gas tank will not only extend its lifespan but also improve its performance. So, take the time to clean your gas tank and enjoy a beautifully manicured lawn all season long.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top