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Lawn Mower Leaks Gas

The lawn mower small engine often has a separate model number. Use the small engine model number for a complete list of symptoms and parts. Watch our model # lookup video for help finding the model number.

The 17 most common part(s) or condition(s) which contribute to the symptom Lawn mower leaks gas are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.


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For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.

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Carburetor Bowl Gasket

If the lawn mower leaks gas the carburetor bowl gasket on the bottom of the carburetor might be dried out or missing. If the leak is coming from the bottom of the carburetor, try replacing the carburetor bowl gasket.

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Float Needle

If the carburetor assembly leaks gas the float needle inside the float bowl might not be sealing properly. If this happens, remove the carburetor assembly from the engine and either clean it thoroughly or replace it.

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Carburetor Gasket

If the lawn mower leaks gas the carburetor gasket on the bottom of the carburetor might be dried out or missing. If the leak is coming from the bottom of the carburetor, try replacing the carburetor gasket.

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Primer Bulb

If the lawn mower engine leaks gas check the primer bulb. Over time the rubber of the primer bulb can become brittle and cracked. If the primer bulb is leaking, replace it. Don't try to patch or repair it.

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Fuel Shut-Off Solenoid

If the lawn mower leaks gas, check the fuel shut off solenoid valve. Be certain the fuel lines fit tightly on the fuel shut off solenoid valve. Also, check for cracks or pinholes in the fuel shut off lines.

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Float

If the carburetor assembly leaks gas the float mechanism inside the float bowl might be sticking open. If this happens remove the carburetor assembly from the engine and either clean it thoroughly or replace it.

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Float Bowl

If the lawn mower leaks gas the carburetor float bowl gasket on the bottom of the carburetor might be dried out or missing. If the leak is coming from the bottom of the carburetor, try replacing the carburetor float bowl gasket.

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Carburetor Kit

If the engine carburetor leaks gas, rebuild the carburetor with this carburetor kit. Carburetor leaks can be caused by bad gaskets, an sticking float and other defects.

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Float Bowl Gasket

If the lawn mower leaks gas the carburetor float bowl gasket on the bottom of the carburetor might be dried out or missing. If the leak is coming from the bottom of the carburetor, try replacing the carburetor float bowl gasket.

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Fuel Filter

If the lawn mower leaks gas, check the connections to the fuel filter and the filter housing itself. If it has a crack, replace it, don't try to repair it. If any of the fuel lines are dry or cracked replace them completely, don't try to cut off a piece and reattach it because the rest of the tubing might also have cracks or defects.

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Fuel Line

If the lawn mower leaks gas, check the fuel lines. If any of them has a crack, replace it, don't try to repair it. If any of the fuel lines are dry or cracked replace them completely, don't try to cut off a piece and reattach it because the rest of the tubing might also have cracks or defects.

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Bowl Nut

If the lawn mower leaks gas the bowl nut on the bottom of the carburetor might be loose, or the bowl nut gasket might be cracked or missing. If the leak is coming from the bottom of the carburetor, try tightening the bowl nut slightly.

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Fuel Tank Kit

If the lawn mower leaks gas check the gas tank for cracks, pinholes, separated seams, or areas that might be worn out. If the tank is leaking do not try to patch it, replace the gas tank.

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Fuel Pump Kit

If the lawn mower leaks gas, check the fuel pump kit. Be certain the fuel lines and vacuum line fit tightly on the fuel pump. Also, check for cracks or pinholes in the fuel pump body.

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Fuel Pump

If the lawn mower engine leaks gas, check the fuel pump. Be certain the fuel lines and vacuum line fit tightly on the fuel pump. Also, check for cracks or pinholes in the fuel pump body.

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Fuel Shut Off

If the lawn mower leaks gas, check the fuel shut off valve. Be certain the fuel lines fit tightly on the fuel shut off. Also, check for cracks or pinholes in the fuel shut off lines.

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Fuel Pump Body

If the lawn mower engine leaks gas, check the fuel pump body. Be certain the fuel lines and vacuum line fit tightly on the fuel pump. Also, check for cracks or pinholes in the fuel pump body.

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