If your Wheel Horse lawn mower is leaking gas, start at the carburetor, because that is where most fuel leaks begin. A dried-out or missing carburetor bowl gasket is the most common cause, especially when gas leaking from the bottom of the lawn mower or carburetor shows up after the mower has been sitting. Next, check the float needle, which should shut off fuel flow into the carburetor. If it is worn or stuck, the carburetor can overflow and cause a lawn mower gas leak. A damaged carburetor gasket can also let fuel seep from the bottom of the carburetor. After that, inspect the primer bulb for cracks or brittleness, since even a small split can lead to a mower leaking fuel. Less often, a leaking fuel shut-off solenoid or cracked fuel line is the problem. A stuck-open carburetor float can also cause carburetor leaking gas, and cleaning or rebuilding the carburetor may be needed. Enter your Wheel Horse model number on RepairClinic.com to find the exact carburetor bowl gasket, float needle, primer bulb, fuel shut-off solenoid, carburetor gasket, or other replacement part that fits your mower.
01 - Wheel Horse 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.