[ccjohnson]

I had a similar experience years ago on a drilling rig. Ended up being a bee that had gotten into fuel tank. It would get sucked up against the fuel line leaving the tank. When the motor was shut down to check on fuel issues, it would float away evidently so there was no problem evident with the fuel system. Motor started up & would run fine for awhile then die. It took a couple of days of trying to find the problem before it finally got sucked up into fuel line good enough to not float away. Got rid of the bee & had no further issues.