If your Troy-Bilt lawn mower is leaking gas, start at the carburetor. The most common cause of a lawn mower gas leak or gas leaking from the bottom of the lawn mower is a dried out or missing carburetor bowl gasket. Next, check the float needle, since a worn needle can fail to shut off fuel and let the carburetor overflow. A bad carburetor gasket is another likely source, especially when fuel is leaking from the bottom of the carburetor. After that, inspect the primer bulb for cracks or brittleness, then check the fuel shut-off solenoid and attached fuel lines for leaks. If those parts look good, the carburetor float may be stuck open, which can often be fixed by cleaning the carburetor or, if needed, rebuilding or replacing it. Whether you are dealing with a Troy-Bilt mower leaking fuel, a carburetor leaking gas, or a steady lawn mower leaking gas after shutoff, RepairClinic.com can help you match the problem to the right part. Enter your model number to find the exact Troy-Bilt replacement part for your mower.
01 - Troy-Bilt Lawn Mower 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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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.
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.