We have a GC4000 Onan generator that came with our Forest River Forester 2551DSLE. It's not been reliable at all. The engine failed at about 100 hours after follow all scheduled maintenance. Cummins replaced the engine under warranty and it ran well for about 8 hours. Then fuel pump failed, you could no longer hear it while priming. At this point it had 130 hours on it and was about 3 years old. I have no great loyalty to Cummins as the OEN engine and fuel pump both failed inside 130 hours so I bought an aftermarket tune up kit off Amazon and replaced pump, filter, and air filter. This worked about 10 hours and quits. I have since ordered 2 more fuel pumps that cost a bit more and mostly good write ups. We'll see if I get a good one. I will post again in the future. I looked for an alternative and the other seems to be RVMP. It seems to get a lot of bad write ups. It's a shame that for $4000 no one makes a good RV generator.
Kind of an old thread but semi relevant.
Odd that the engine blew at 100hrs. (Assume it had an irreparable failure if it was replaced wholesale under warranty.)
Not sure why you’d consider replacing the whole generator for a fuel supply issue.
Maybe this is a fuel supply issue to the pump? Kinked line somewhere or something restricting free flow to the pump and burning it up?
