Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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.
The second most common cause is from faulty mechanical fuel pumps. Your engine may or may not have this option. If you have no fuel pump mounted on the side of your engine then you do not have this setup. In the event you do have a fuel pump, and you did not find the problem in the carburetor follow these steps.
I am getting gas in my oil on riding lawn mower, what would be the cause and how do I fix it?
Please let me know if this doesn't help.