Removing old gas from a lawn mower is essential for its performance. Old gas can cause issues like starting problems and engine damage.
In this post, we will guide you through the simple steps to remove old gas from your lawn mower. Proper maintenance ensures your mower runs smoothly and lasts longer. Old gas can become stale and may harm the engine. It’s crucial to know how to clear out the old fuel and replace it with fresh gas.
Whether you’re a seasoned gardener or a newbie, following these steps will help keep your lawn mower in top shape. Let’s dive into the process to ensure your lawn mower stays in peak condition.
Gather Necessary Tools
Removing old gas from your lawn mower is essential for its proper functioning. The first step is to gather the necessary tools. This ensures the process is smooth and efficient. Let’s explore the tools and materials needed and the safety gear required.
Tools And Materials Needed
To remove old gas from your lawn mower, you will need specific tools. These tools help you do the job correctly and safely. Here is a list of what you will need:
- A siphon pump or a turkey baster
- A gas can or container
- A clean rag or paper towels
- Fuel stabilizer (optional)
- Funnel
These items are easy to find at any hardware store. They will make the task much easier.
Safety Gear
Safety is crucial when working with gasoline. Proper gear protects you from harm. Here is what you should wear:
- Safety goggles to protect your eyes
- Rubber gloves to protect your hands
- Long sleeves and pants to protect your skin
Wearing the right gear keeps you safe and reduces the risk of accidents. Always prioritize safety first.
Prepare Lawn Mower
Before you start the process of removing old gas from your lawn mower, it’s important to prepare the machine properly. This will ensure safety and efficiency. Follow these steps for a smooth experience.
Move To A Well-ventilated Area
First, move your lawn mower to a well-ventilated area. This helps to prevent inhaling harmful fumes. Choose an open space like a garage with the door open or an outdoor area. Good ventilation is crucial for safety.
Disconnect The Spark Plug
Next, disconnect the spark plug. This is an essential step to prevent accidental starts. Locate the spark plug wire, which is usually a thick black wire. Gently pull it off the spark plug.
With these steps, your lawn mower is now ready for gas removal. Always prioritize safety during this process.
Drain Old Gas
Old gas in your lawn mower can cause many issues. It can lead to poor performance, or it may prevent the mower from starting. Removing the old gas is essential. Follow these steps to drain the old gas from your lawn mower efficiently.
Locate Fuel Tank
The first step is to find the fuel tank. The fuel tank is usually at the back of the mower. Look for a cap that you can unscrew. This is where you will access the gas.
Use A Siphon Pump
A siphon pump is an effective tool to remove old gas. Insert the pump into the fuel tank. Then, start pumping to draw the gas out. This tool makes the process quick and clean.
Empty Gas Into Container
Once the gas is siphoned, you need a container. Make sure the container is safe for holding fuel. Transfer the old gas into the container. Be careful not to spill any fuel. Dispose of the old gas properly, according to local guidelines.

Clean Fuel Tank
To keep your lawn mower running smoothly, it’s vital to clean the fuel tank regularly. Old gas can cause engine issues and reduce performance. Follow these steps to ensure your lawn mower’s fuel tank is clean and free from residue.
Remove Residual Gas
First, you need to remove any remaining gas in the tank. Use a siphon pump to drain the fuel. Place the pump’s tube into the tank and the other end into a container. Pump until all the gas is out.
Check the fuel lines and filters for clogs. Clean or replace them if needed. This ensures no old gas remains in the system.
Wipe Inside Of Tank
Once the tank is empty, it’s time to wipe the inside. Use a clean cloth or paper towels. Reach into the tank and wipe down the sides and bottom.
For hard-to-reach areas, use a long brush. Ensure all residue is removed to prevent contamination of new fuel.
| Tools Needed | Purpose |
|---|---|
| Siphon Pump | Remove gas |
| Clean Cloth | Wipe the tank |
| Long Brush | Reach inside the tank |
After cleaning, inspect the tank for damage. Look for cracks or leaks. If any, repair or replace the tank.
Once the tank is clean and dry, add fresh gas. This will keep your lawn mower running efficiently.
Replace Fuel Filter
To keep your lawn mower running smoothly, you need to remove old gas and replace the fuel filter. Over time, a dirty filter can block fuel flow. This can make your mower hard to start or cause it to run poorly. Changing the fuel filter is an easy task. Follow these steps to ensure your lawn mower runs like new.
Locate Fuel Filter
First, you need to find the fuel filter. It is usually located between the fuel tank and the engine. Check your lawn mower’s manual for the exact location. If you don’t have the manual, look for a small, cylindrical part connected to the fuel line. It might be made of plastic or metal.
Install New Filter
Once you have located the fuel filter, it’s time to replace it. Follow these simple steps:
- Turn off the lawn mower and let it cool down.
- Use a pair of pliers to remove the clamps holding the old filter in place.
- Take out the old filter carefully, making sure not to spill any fuel.
- Place the new filter in the same position as the old one.
- Secure the new filter with the clamps.
- Check for any leaks and ensure the filter is securely in place.
Your new fuel filter is now installed. This will help your lawn mower run efficiently.

Refill With Fresh Gas
Refilling your lawn mower with fresh gas can improve its performance. Old gas can cause engine problems. Follow these steps to refill with new gas and keep your mower running smoothly.
Choose The Right Gasoline
Select fresh gasoline for your lawn mower. Check the owner’s manual for specific gas recommendations. Use gasoline with an octane rating of 87 or higher. Avoid gas with more than 10% ethanol.
Pour New Gas Into Tank
Ensure the mower is on a flat surface. Open the gas cap carefully. Use a funnel to pour the gasoline into the tank. Fill the tank slowly to avoid spills. Do not overfill the tank.
Secure the gas cap tightly. Ensure there are no leaks. Your lawn mower is now ready to use with fresh gas. Enjoy a smooth mowing experience!
Reassemble Lawn Mower
After removing the old gas from your lawn mower, it’s time to reassemble it. This step is crucial for ensuring your lawn mower runs smoothly. Follow these steps carefully.
Reconnect Spark Plug
First, locate the spark plug wire. It’s usually near the engine. Reconnect it firmly to the spark plug. This step ensures the engine will start.
Check For Leaks
Next, inspect the fuel system. Look for any leaks around the tank and fuel lines. Tighten any loose connections. Ensure there are no visible cracks or damages.
If you notice any leaks, fix them before using the mower. Leaks can be dangerous and cause the mower to malfunction.
| Component | Action |
|---|---|
| Spark Plug | Reconnect |
| Fuel System | Inspect for leaks |
| Connections | Tighten |
Test Lawn Mower
Testing your lawn mower after removing old gas is crucial. This ensures everything runs smoothly with fresh fuel. You want to make sure the engine starts properly and maintains good performance. Follow these steps to test your lawn mower effectively.
Start The Engine
First, press the primer bulb a few times. This helps get the fuel into the carburetor. Then, pull the starter cord firmly. Listen for any unusual sounds. If the engine struggles to start, there might be remaining old gas.
Run For A Few Minutes
Once the engine starts, let it run for a few minutes. Observe the mower’s behavior. It should run smoothly without sputtering. Check for any smoke or strange smells. Running the engine helps clear out any leftover residue. This ensures the fresh gas circulates properly.

Frequently Asked Questions
How Do I Know If My Lawn Mower Has Old Gas?
Check for difficulty starting, rough idling, or a sour smell. Old gas can cause these issues.
Is It Necessary To Remove Old Gas From A Lawn Mower?
Yes, old gas can damage the engine. It’s essential to remove it for optimal performance.
What Tools Do I Need To Remove Old Gas?
You need a siphon pump, a gas can, and gloves. These tools help you safely remove the old gas.
How Long Can Gas Sit In A Lawn Mower?
Gas can sit for about 30 days before it starts degrading. After that, it can cause problems.
Conclusion
Removing old gas from your lawn mower is essential for its performance. Follow the steps carefully to ensure your mower runs smoothly. Regular maintenance helps extend the life of your equipment. Always use fresh fuel and store it properly. Dispose of old gas safely and responsibly.
This simple task can save you from future headaches. Keep your lawn mower in top shape with these tips. Happy mowing!

