I have a leak that I can't find. It comes from the oil drain cover under the machine. I know all leaks will end up there but I cleaned every thing a few times and can't see any wet spots. I'm thinking it's a fule tank leak that I can't see. Does anyone know if the plastic tanks have a problem with wear from vibration, and if I could fix it with out removal. It's under the motor and is a lot of work to remove.