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Hello Dave, my name is XXXXX XXXXX I can help you with this problem. There are two common causes for gas leaking into the engine oil. The most common cause is a faulty carburetor float or needle valve allowing gas to leak into the intake and then into the crankcase. To check for this problem follow these steps. 1  Shut off the gas to the carburetor, if your mower doesn't have a shut off valve simple pinch the fuel line with a pair of vice grips. 2  Using a wrench remove the carburetor bowl retainer, this may look like a bolt head or a nut with an adjustable valve through it.
What happens is you might be getting leak-down from your fuel injectors (or gas leaking out your carb through either a porous casting or some other leak-out). The fuel pools in your cylinders and eventually bleeds down the cylinder walls and into your oil pan. apoorapothecary Â· 8 years ago.