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How to Siphon Gas from Lawn Mower: Easy Steps to Follow

Have you wondered how to remove gas from your lawn mower safely? We can guide you. Our detailed instructions will walk you through the process. With our expertise, you’ll be able to handle this task confidently.

How to siphon gas from a lawnmower, step by step:

Use a siphon pump to extract gasoline from the fuel tank. Insert the intake hose into the tank and pump it to drain from the cap. Run the engine to use the remaining fuel and clean the carburetor. Properly dispose of old gasoline.

Don’t let the task of siphoning gas from your lawnmower intimidate you. Our comprehensive guide will make it a breeze. With our help, you’ll tackle this task like a pro. Let’s explore further!


● Siphoning Gas from a Lawnmower, Step-by-Step:

Using a siphon pump is the cleanest and fastest way to extract bad gasoline from the fuel tank. It can be used both for riding lawnmowers and for pushing lawnmowers. You can buy a siphon pump conveniently by visiting a car parts dealer for as little as $10.

– Riding lawnmowers:

On the rear left side, the gas tank is often below the seat when riding lawnmowers—theme time. You may need to lift the seat to access the fuel cap for specific versions.

● Step 1: Insert the hoses in the tank:

To pump the gasoline, open the cap and insert the siphon pump’s top hose so that it is completely submerged in the tank. A siphon pump comprises two hoses.

The top hose is placed from where the fuel needs to be drained. Conversely, the bottom hose brings the drained fuel into a secondary container.

● Step 2: Use a plastic container:

Handle any plastic cylinder or bottle to store the fuel removed from the tank. Avoid using a metal container, as the gas flow can generate a static charge, which may create a spark in the presence of metal. This condition cannot be afforded since we are dealing with gas.

● Step 3: Siphon the fuel:

Pump the siphon with your hand to drain the fuel from the tank and shift it to the plastic container. Remove any tangles or curls in the siphon hose for quick drainage. Keep siphoning the gasoline until the fuel tank is empty.

In my 20 years of experience, I’ve always emphasized the importance of safety when siphoning gas from a lawn mower. Always work in a well-ventilated area, away from open flames or sparks, and never forget to wear protective gloves and eyewear. Remember, never siphon by mouth; always use a proper siphon pump.

-Walk-behind lawnmowers:

The approach is the same for walk-behind lawnmowers, except that the gas tank is more accessible to identify since it is externally on the device’s top. Remove the cap and connect the siphon hose to drain the gas.

● Additional Methods for Gasoline Removal:

If a siphon pump isn’t available, you can try additional methods to remove gasoline from your lawnmower. These methods involve the manual removal of gas from the tank.

1. Detaching the fuel line:

This method can be applied to both riding and walk-behind lawnmowers. The fuel line that carries gas from the tank to the carburetor is emptied using this method.

– Step 1: Locate the carburetor:

The first step is to locate the carburetor on your lawnmower. The carburetor is right next to the air filter for walk-behind mowers and is visible externally. You must lift the mower deck for riding mowers and remove the air filter assembly to grasp the carburetor and the engine.

– Step 2: Place the fuel-catching container:

Once you have located the carburetor, use a rag to clean the fuel line from any gas. Place a fuel-catching container right underneath the fuel line. After that, a pair of nose pliers were used to detach the clamp holding the line and allow all of the gasoline coming from the tank to be collected in the container.

– Step 3: Dispose of the old fuel:

With the tank emptied, please dispose of the old gasoline by taking it to an automotive parts dealer. It is also better to open your carburetor and clean it with WD-40 to remove any deposits formed due to old gas. It might unclog some restricted jets and improve the starting of your engine.

2. Tilting the lawnmower:

Tilting the lawnmower can only be possible in walk-behind mowers since they are compact enough to be tilted. For riding lawnmowers, this method cannot be applied.

– Step 1: Tilt the mower correctly:

The first step is to tilt the mower correctly with the air filter pointing upwards. It ensures that the engine oil doesn’t flow into the fuel lines of the carburetor. Also, remove the spark plug wire as a precautionary measure.

– Step 2: Arrange a container:

Place a container or bowl to collect the gas with the mower tilted. Open the fuel cap and collect the gasoline entirely in the container.

– Step 3: Dump the old fuel:

Dispose of the old gasoline in the container. Clean the lawnmower carburetor and reattach the spark plug wire.

● Some Recommendations for better performance:

Once the fuel tank has been emptied, additional steps should be performed to ensure that old gasoline has been completely removed from the lawnmower.

– Run the mower for a while:

Start your lawnmower’s engine and allow it to run for a while. The engine runs due to some fuel remnants and the carburetor left in the fuel lines. Once the fuel has been consumed, the engine shuts down by itself.

Over the years, I’ve noticed that lawnmowers can be hard to start, run rough, or won’t start at all when the gas needs to be replaced. It’s crucial to pay attention to these signs as they indicate old or contaminated gas.

– Clean the carburetor:

It is suggested that if fuel quality has degraded and the tank has been emptied, you should clean the carburetor, too. This shall unclog some jets blocked by fuel deposits and improve the engine’s flow of air-fuel charge.

To clean the carburetor, loosen the bowl nut and remove the bowl. Spray a carburetor cleaner liquid on the interiors of the carburetor thoroughly. Spray some fluid on the bowl nut as well.

An air compressor spray might also clear some debris formed inside the carburetor if available. Once cleaned, connect all the parts back and fill the tank with fresh gas. You will notice much better engine performance after taking these steps.

Related Questions:

1. What is the best lawnmower gas?

For small engines, some general guidelines regarding ideal gasoline are as follows:

  • The fuel should be unleaded and clean
  • It should have a minimum octane number of 87 or RON of 91.
  • Ideally, it should have 10% ethanol and 15% MTBE (methyl tertiary butyl ether)

2. Do I need to drain the gasoline from my lawnmower?

If you plan to store your lawnmower for long, it is better to drain the gasoline from it. Unused gas left in the fuel tank can get stale with time. It causes choking of the carburetor by forming sticky deposits. It also invites rust. Hence, it is better to drain the fuel tank.

Otherwise, you can add a fuel stabilizer to the tank and allow the mower to run for some time. This running of the engine distributes the fuel stabilizer evenly across the fuel lines and prevents the gasoline from becoming stale.

3. How long does gasoline last with a stabilizer?

Typically, gasoline stabilized with a fuel stabilizer lasts 1-3 years. However, this only works for fresh fuel. Fuel stabilizers aren’t very effective on fuels whose quality has already been degraded. Or the fuels that have been contaminated with impurities.

4. Will harmful gas cause a lawnmower not to start?

Lousy quality fuel might have gummed the carburetor and other parts, such as the fuel filter. First, drain the old fuel from the tank to start your lawnmower with lousy fuel, preferably using a hand siphon.

Once the tank is emptied, clean the carburetor thoroughly using a carb cleaner spray. After that, add fresh fuel to the tank and rerun your engine. If it still doesn’t start, consider replacing the fuel filter.

Some other causes of an engine not starting are:

  • Faulty spark plug
  • Weakened battery
  • Faulty voltage regulator/starter motor in riding lawnmowers
  • Broken flywheel key
  • Insufficient fuel

Over the years, I’ve seen people make common mistakes when siphoning gas from a lawn mower, such as not taking proper safety precautions, using inappropriate tools for siphoning, and improper disposal of old gas.


Siphoning the gas from your lawn mower can be performed easily. We strongly advise that while carrying out the fuel drainage, be very careful due to gasoline’s explosive nature.

Always perform the drainage in your driveway where electrical connections are far, and the sunlight is not directly falling. Lighters, cigarettes, and matchboxes must be kept away. To prepare your lawn mower for the process, first set it up on a flat and stable surface. 

Disconnect the fuel line from the lawn mower’s gas tank and hold the funnel over a container to catch the gasoline. Next, a mower with a siphon pump starts the gas flow into the pan. Be sure to monitor the process to prevent overflow or spillage.

• The Imyou’vece of Draining Gas from Your Lawn Mower

Once you’ve drained the gas from your lawn mower, some residue may be left in the tank. Why is it important to do this? Leaving old gas in your lawn mower can create a varnish-like substance that clogs the carburetor and prevents the engine from working.

After you’ve drained the gas, run the mower to use up any remaining gas in the carburetor. Then, you can reconnect the wire and run the mower until it stops to ensure all the gas has been used. Furthermore, we recommend that the gasoline be recycled appropriately by taking it to the agent.

Using a fuel stabilizer in your tank is a perfect practice as it maintains the fuel quality and prevents you from replenishing the fuel.

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  1. Ashley Herrera says:

    I love how you included video tutorials, it makes the process even clearer.

    • Allard Vdhooft says:

      Thank you for your feedback, Ashley! I’m glad you found the video tutorials helpful in understanding the siphoning process. Let me know if you have any more questions.

  2. Martha Mitchelle says:

    Great instructions on siphoning gas from lawnmowers, thank you!

    • Allard Vdhooft says:

      Thank you, Martha! I’m glad you found the instructions helpful. Stay safe while siphoning gas from your lawnmower.

  3. Daisy Stephens says:

    Would using a fuel stabilizer prevent the need to siphon gas?

    • Allard Vdhooft says:

      Using a fuel stabilizer can help prevent the need to siphon gas by maintaining the fuel quality in your lawnmower tank. Check out the full article for more information.

  4. Javier Ellis says:

    I feel more confident about caring for my lawnmower after reading this article, thank you!

    • Allard Vdhooft says:

      Thank you for your kind words, Javier! I’m glad you found the article helpful for caring for your lawnmower. Feel free to reach out if you have any more questions in the future!

  5. Charles Henry says:

    Can I reuse the gas that I siphon from my lawnmower?

    • Allard Vdhooft says:

      Charles Henry, Yes, you can reuse the gas siphoned from your lawnmower. Just make sure to use a clean container and avoid metal ones to prevent any sparks. Stay safe!

  6. Katrina Mills says:

    How often should I clean my lawnmower’s carburetor?

    • Allard Vdhooft says:

      Hi Katrina! For optimal performance, we recommend cleaning your lawnmower’s carburetor once a year or as needed to prevent clogs from old gas deposits. Check out the full post for more details.

  7. Mildred Mitchell says:

    I appreciate the additional methods for gas drainage, very informative.

    • Allard Vdhooft says:

      Thank you for the positive feedback, Mildred! I’m glad you found the additional gas drainage methods informative. Let me know if you have any other questions.

  8. Ann Peterson says:

    Extremely helpful article, I learned a lot about maintaining my lawnmower.

    • Allard Vdhooft says:

      Thank you for reading! I’m glad you found the article helpful in maintaining your lawnmower. Don’t hesitate to reach out if you have any questions about the process.

  9. Stella Jackson says:

    Very detailed explanation, makes it easy for a beginner like me to understand.

    • Allard Vdhooft says:

      Thank you, Stella! I’m glad you found the explanation helpful. If you have any more questions, feel free to ask. Happy lawnmower maintenance!

  10. Mason Simmmons says:

    Can I use this method to drain my generator’s gas tank as well?

    • Allard Vdhooft says:

      Yes, you can use a siphon pump to drain the gas tank of your generator as well. Make sure to follow the same steps outlined in the article for best results.

  11. Pauline Berry says:

    Is it possible to siphon gas from an electric lawnmower?

    • Allard Vdhooft says:

      Hi Pauline! Yes, it is possible to siphon gas from an electric lawnmower. I recommend using a siphon pump for a quick and clean extraction process. Hope this helps!

  12. Janet Wheeler says:

    This guide is a lifesaver, I was struggling with this issue, thank you!

    • Allard Vdhooft says:

      Thank you, Janet! I’m glad this guide was helpful to you. If you have any other questions or need further assistance, feel free to reach out. Happy mowing!

  13. Jacob Thomas says:

    What are the signs that my lawnmower’s gas has gone bad?

    • Allard Vdhooft says:

      Hi Jacob, if you notice your lawnmower engine having trouble starting, it might be a sign of bad gas. The blog post provides detailed steps on how to siphon the gas out. Hope this helps!

  14. Andy Wilson says:

    Thank you for the tips on keeping my lawnmower in top condition, much appreciated!

    • Allard Vdhooft says:

      Glad you found the tips helpful! Remember to use caution when siphoning gas and always dispose of old gasoline properly. Happy mowing!

  15. Logan Coleman says:

    Are there any risks involved in siphoning gas from a lawnmower?

    • Allard Vdhooft says:

      It’s always best to empty the gas tank before storing your lawnmower. Use a siphon pump for a clean and efficient drainage process. Stay safe!

  16. Hailey Johnston says:

    I didn’t know about the importance of draining old gas, thanks for sharing!

    • Allard Vdhooft says:

      Glad you found the information helpful! Remember to always drain the gas when storing your lawnmower. Happy to provide more tips if needed.

  17. Eddie Nguyen says:

    Thank you for the step-by-step guide, it’s very helpful!

    • Allard Vdhooft says:

      Thank you, Eddie! I’m glad you found the guide helpful. If you have any more questions or need further assistance, feel free to reach out. Happy to help!

  18. Robert Thompson says:

    Is it safe to siphon gas on my own?

    • Allard Vdhooft says:

      Yes, it is safe to siphon gas from your lawnmower using a siphon pump. Follow the step-by-step instructions in the article to ensure a clean and efficient process. Stay safe!

  19. Jamie Morrison says:

    What do I do with the old gas after siphoning it?

    • Allard Vdhooft says:

      For proper gasoline disposal, I recommend checking with your local recycling center. They usually have the right facilities to handle hazardous waste like old gas.

  20. Kylie Hanson says:

    How do I know if my lawnmower has a carburetor issue?

    • Allard Vdhooft says:

      Hi Kylie! You can check for a carburetor issue on your lawnmower if it’s hard to start, idling rough, or losing power. We recommend siphoning the gas as a first step. Hope this helps!