How To Drain Gas From Lawn Mower Without Siphon?

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By Kirsi Jansa

Draining gas from a lawn mower is important, especially before winter storage, to prevent old gas from going stale and gumming up the carburetor and fuel system. Stale fuel can lead to starting problems and poor performance. Additionally, removing fuel reduces the risk of leaks and fire hazards during storage. By draining the gas, you help ensure a smoother start-up when you use the mower again.

The most common method to remove drain gas from a lawn mower is to use a siphon. However, a siphon may not always be available to you, or it may break, or you may lose it when required.

Many people ask how to drain gas from a lawn mower without a siphon. This article explains 5 different methods you can use to remove gas from a lawn mower without using a siphon.

Drain Gas From Lawn Mower Without Siphon

5 Methods to Remove Gas from a Lawn Mower without a Siphon

Make sure you turn over the engine after draining (regardless of the method you select) to consume the remaining gasoline in fuel pipes, engine, and carburetor.

Through Fuel Lines

  • Ensure the lawn mower is cool and placed in a well-ventilated area.
  • Locate the fuel lines connected to the gas tank.
  • Using pliers or a wrench, disconnect the fuel line.
  • Place a container below to catch the draining gasoline.
  • Once emptied, reattach the fuel line securely.


  • Position the lawn mower on a level surface, ensuring it’s cool.
  • Place a funnel over a gas container.
  • Carefully tilt the mower and pour the gasoline into the funnel.
  • Pour slowly to prevent spillage and overflow.

Tilt and Pour

  • Secure the lawn mower on a flat surface and ensure it’s turned off and cool.
  • Carefully tilt the mower to the side, positioning a container at the gas tank opening. This method is only applicable if you can easily lift the mower. You may need an extra pair of hands to help you.
  • Gradually pour the gas into the container, being careful to avoid spills.

Run the Mower (Only if Gas is Fresh)

  • Place the mower in an open, well-ventilated area.
  • Start the lawn mower and let it run.
  • Monitor the mower as it operates until it stops, indicating the gas has been used up.

Electric Fuel Pump

  • Connect the electric fuel pump’s input hose to the mower’s gas tank.
  • Position the pump’s output hose over a suitable container.
  • Turn on the pump, allowing it to transfer the gasoline from the mower to the container.
  • Once the tank is empty, disconnect the pump and secure the gas tank cap.

5 Methods to Remove Gas from a Lawn Mower without a Siphon

Safety Tips: Draining Gas without a Siphon

Work in a Well-Ventilated Area: This prevents the accumulation of toxic and flammable fumes, reducing the risk of inhalation and fire hazards.

Wear Protective Gear: Wearing gloves and safety goggles protects your skin and eyes from potential splashes of gasoline.

Avoid Flames and Sparks: Ensure no open flames, cigarettes, or spark-producing equipment are nearby to avoid the risk of ignition.

Use Suitable Containers: Only use containers approved for gasoline storage to prevent leaks and spills.

Secure the Lawn Mower: Ensure the mower is stable and on a flat surface to prevent tipping and spills during the draining process.

Dispose of Gasoline Properly: Never pour gasoline down drains or into the ground; take it to a hazardous waste disposal facility.

Check Local Regulations: Always check and follow local regulations and guidelines regarding gasoline handling and disposal to ensure safety and compliance.

Safety Tips Draining Gas without a Siphon

Drawbacks of Not Draining Gas from a Lawn Mower

Engine Damage

Not draining old or contaminated gas can lead to engine damage. Over time, gas can degrade and form gummy deposits and varnish, which can clog the carburetor and fuel lines, impairing engine performance and potentially leading to costly repairs.

Starting Issues:

Leaving stale gas in the mower can make starting the engine difficult. The volatile gasoline components evaporate over time, leaving a thicker, less combustible residue that can impede ignition and disrupt the engine’s operation.

Reduced Performance

Old gas can result in poor engine performance. As gasoline ages, its combustibility decreases, leading to incomplete combustion, reduced engine power, inefficient fuel use, and increased emissions.

Corrosion and Rust

Gasoline can contain impurities and moisture that promote rust and corrosion inside the fuel tank and system. Draining the gas helps prevent the accumulation of these contaminants and extends the life of the mower’s fuel system components.

Ethanol Problems

Most gasoline contains ethanol, which can absorb water from the air. This water-ethanol mixture can separate from the gasoline and sink, leading to corrosion, formation of deposits, and engine damage, especially if the mower is left unused for extended periods.

Environmental Hazard

Spilled or improperly disposed of gasoline is hazardous to the environment. Ensuring the gas tank is emptied, and the gasoline is disposed of correctly minimizes the risk of environmental contamination and complies with safety regulations.

Frequently Asked Questions

Why is it important to turn on the lawn mower after draining the gas?

Turning on the lawn mower after draining the gas is essential to ensure any residual fuel left in the carburetor and fuel lines is burned off, preventing it from becoming stale and potentially causing starting issues or damage. Additionally, it helps verify that the fuel system is empty and alleviates pressure in the fuel system. This process contributes to the overall maintenance of the mower, ensuring longevity and optimal performance.

Can I turn on the engine to eliminate gas from a lawn mower if the gas is stale?

While it is possible to run the engine to use up stale gas, it might not be the best method, as the stale fuel can lead to starting difficulties and potentially harm the engine and fuel system. Instead, manually removing and refilling the stale gas with fresh fuel is recommended. After removing the stale gas, inspecting and cleaning the carburetor and replacing the fuel filter can help ensure smooth operation.

What to do if I inhale the gas fumes while draining?

If you inhale gas fumes, immediately move to fresh air to avoid potential respiratory distress or poisoning. If symptoms such as dizziness, headaches, or nausea persist, seek medical attention promptly.

Why is it important to drain gas before winterizing a lawn mower?

It’s important to drain gas before winterizing a lawn mower to prevent the fuel from becoming stale and forming deposits in the fuel system. Stale fuel can lead to starting issues, reduced performance, and potential damage to the engine components.

Can I add a fuel stabilizer instead of removing the gas before winterizing my lawn mower?

Adding a fuel stabilizer can be an alternative to draining gas. It helps preserve the gasoline’s quality, preventing it from degrading and forming gummy deposits and ensuring smoother start-ups after winter storage.

How frequently should I drain my lawn mower?

Typically, draining the lawn mower should be done at the end of the mowing season before winterizing or if the mower will be inactive for an extended period. This helps maintain the mower’s performance and prolongs the engine’s life.

Can I reuse the drained gasoline?

Drained gasoline can be reused if it is clean and free of contaminants. However, if it appears cloudy, discolored, or has a sour smell, it’s best to dispose of it properly at a hazardous waste facility to avoid engine damage.

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