I recently bought a Mustang 940 with the Yanmar 4TN82E. When starting, it will turn over and fire, but not start. If you keep the key in the start position, it will fire (but not start/run) repeatedly. It has a new outer air filter, but I am waiting on the inner safety filter to get shipped to Alaska. If you give it a tiny squirt of starting fluid (I know... ) it starts right up. The guy I bought it from said it probably needs a lift pump, which made sense to me. I have one on order. Any other thoughts?