[ccjohnson]

For what it's worth, I had the same issue kinda on a rig engine several years ago. It ended up being a honey bee that got into the fuel tank. Whenever engine died from fuel starvation the bee would drift away from the intake and things would run fine for awhile. Finally it got sucked far enough into check valve that we were able to find it. Was a major PITA intermittent problem for about a week.