Since the generator runs while the prime button is pushed, this pretty much rules out a fuel problem. The following is info for a 75D model:
Engine starts then shuts down when Start/Stop switch is released.
I assume that the Prime button ties in with Start/Stop
Engine oil level is low.
Defective Low Oil Pressure Switch.
Defective Coolant Temperature Switch.
Defective Control Module circuit board.
Coolant Level is Low.
Defective Low Coolant Level Switch.
Defective Start/Stop switch.
No A.C. output.
Defective engine control board.
If no A.C output:
Reset main line circuit breaker.
Generator internal failure.
Generac discontinued manufacturing RV generators several years ago, so servicing and obtaining parts will be a challenge.
