What Are the Causes of Gas in an Oil Pan?
by Stephanie EllisWhen you are changing the oil in your vehicle, one of the worst things to notice is the smell of gas in your oil pan. It means that gasoline is somehow making its way into your engine's oil, a problem that can cost hundreds of dollars to repair.
Badly Adjusted Carburetor
Faulty Fuel Pump

Cars that are more than ten years old usually have mechanical fuel pumps. The fuel pump is attached to one side of the engine; if you notice fuel leaking from the connection between the two, your fuel pump has almost certainly failed. Unless you are an expert home mechanic, fixing this problem should be left to the professionals.
Misfiring Cylinder

If your vehicle's engine is running with a stuttering or knocking sound, it is possible that one cylinder is not firing correctly, which leads to gas condensing in the faulty cylinder and draining into your oil pan. Accurately diagnosing this problem requires some specialized testing equipment and needs to be done by a trained mechanic.
Blown Head Gasket

The gasket that sits between the engine block and cylinder head can "blow," leading to coolant leaking into the oil or exhaust fumes being pushed into the coolant system. Driving with a blown head gasket can easily ruin the engine, leading to costly repairs. Your mechanic can run a compression test on your engine; if there is a leak in the head gasket, the compression will be lower than expected.
- moteur image by Secret Side from Fotolia.com