The lawn mowersmall 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 part(s) or condition(s) listed below for the symptom Lawn mower leaking gas are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
Lawn Mower Leaking Gas? Lawn Mower Troubleshooting
Lawn Mower Not Self-Propelling? Lawn Mower Troubleshooting
Lawn Mower Runs Rough? Lawn Mower Troubleshooting
Lawn Mower Starts Then Stalls? Lawn Mower Troubleshooting
Lawn Mower Won't Start? Lawn Mower Troubleshooting
Riding Mower Blades Won't Engage? Riding Mower Troubleshooting
Lawn Mower Smoking? Lawn Mower Troubleshooting
Lawn Mower Battery Keeps Dying? Lawn Mower TroubleshootingIf 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.
The float needle might not be shutting off the fuel. The float needle opens and closes the float valve to allow fuel to enter the float bowl. If the float needle is damaged, the carburetor will continue to fill with fuel until it overflows. If the float needle is defective, replace it.
If fuel is leaking from the bottom of the carburetor, the carburetor gasket might be dried out or missing.
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.
Check the fuel shut-off valve for leaks, and ensure that the fuel lines fit tightly on the valve. If the fuel shut-off solenoid is leaking, replace it. In addition, inspect the fuel shut off lines for cracks or tiny holes. If a fuel shut-off line is leaking, replace it.
The float might be stuck open. If the float is stuck open, remove the carburetor assembly from the engine and clean it thoroughly. If the cleaning the carburetor is not effective, either rebuild or replace the carburetor.
If fuel is leaking from the bottom of the carburetor, the float bowl gasket might be dried out or missing.
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.
If fuel is leaking from the bottom of the carburetor, the float bowl gasket might be dried out or missing.
Check the connections to the fuel filter and to the filter housing. If any of the fuel lines are dry or cracked, replace them. Don't try to cut off a piece of the fuel line and then reattach it.
If any of the fuel lines are dry or cracked, replace them. Don't try to cut off a piece of the fuel line and then reattach it.
Ensure that the fuel lines and vacuum line fit tightly on the fuel pump. Inspect the fuel pump body for cracks or tiny holes. If the fuel pump has a leak, replace it.
The fuel shut-off valve might be leaking. Check the fuel shut-off valve for leaks, and ensure that the fuel lines fit tightly on the valve. If the fuel shut-off valve is leaking, replace it. In addition, inspect the fuel shut off lines for cracks or tiny holes. If a fuel shut-off line is leaking, replace it.
Ensure that the fuel lines and vacuum line fit tightly on the fuel pump. Inspect the fuel pump body for cracks or tiny holes. If the fuel pump has a leak, replace it.
