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McCulloch Lawn mower leaking gas

01 - McCulloch 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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02 - McCulloch Lawn Mower Float Needle

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.
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03 - McCulloch Lawn Mower Carburetor Gasket

If fuel is leaking from the bottom of the carburetor, the carburetor gasket might be dried out or missing.
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04 - McCulloch Lawn Mower 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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05 - McCulloch Lawn Mower Fuel Shut-Off Solenoid

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.
Highly Likely

06 - McCulloch Lawn Mower Float

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.
Highly Likely