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Jack Zimmerman · 10-15-2024, 04:46 PM

I've been told that a pretty common failure issue on the Onan QD generators is the fuel pump power supply on the main circuit board. The symptom is that the generator will shut off randomly and it may or may not restart. Our 10K unit did it when it got hot and as far as I know, the only permanent fix is to get a new circuit board. However, an easy work around and a way to diagnose if that is the problem is to run a jumper wire from the + battery connection on the side of the generator to the fuel pump power wire which is accessible through a small cover on the front right side of the generator. If that fixes the problem you'll know it's the circuit board. And if you use that method to run the generator until you get a new circuit board (like I did), you just need to make sure you disconnect the jumper wire when you shut off the generator or the fuel pump will keep running.

10-15-2024, 04:46 PM	#3
Jack Zimmerman Junior Member Join Date: Dec 2001 Location: Clemmons, NC Posts: 35 Likes: 0 Liked 11 Times in 6 Posts	Re: Onan 12.5kw issues I've been told that a pretty common failure issue on the Onan QD generators is the fuel pump power supply on the main circuit board. The symptom is that the generator will shut off randomly and it may or may not restart. Our 10K unit did it when it got hot and as far as I know, the only permanent fix is to get a new circuit board. However, an easy work around and a way to diagnose if that is the problem is to run a jumper wire from the + battery connection on the side of the generator to the fuel pump power wire which is accessible through a small cover on the front right side of the generator. If that fixes the problem you'll know it's the circuit board. And if you use that method to run the generator until you get a new circuit board (like I did), you just need to make sure you disconnect the jumper wire when you shut off the generator or the fuel pump will keep running.