Un Modifying (fuel pump related) Onan 4 Emerald BGE UPDATE

Alright I am ready, flame suit on, while still "troubleshooting" the gen set, I was testing the K4 relay, I followed the black wire all the way to the starter solenoid, and the friggin light turned on, well stupid you should have 12v here when battery is hooked up, well staring me right in the face was this rubber thing, wow its got a cap, hmmm whats under the cap??



A FRIGGIN FUSE, opened it up no fuse inside it, boy do I feel like a friggin douche, but it happens, I was so happy to get this RV I simply when do the biggest problems without looking for the simplest.


Although I wish somewhere in the manual for us dummies, besides the schematics, it would mention this fuse.

so anyways, had to go get a fuse because its a micro fuse, hooked up everything, and everything is working fine.

I do have to wonder what the prior owner was thinking when he installed the external FP, maybe he was like me:crazy:

Thanks everyone for their guidance, and it did not go to waste, I learned a lot by doing all the "extra" trouble shooting.



Here is the gen set, all hooked up, on the garage floor, tomorrow it will go into the RV

Ok I installed a new control board and still no power to the fuel pump.

gen set cranks


any suggestions

K Charles wrote:
The power for the fuel pump does in fact come from the control board.

Ok great, I did get to test the K4 wire (fuel pump) and there is no voltage when cranking or running

The power for the fuel pump does in fact come from the control board.

MrWizard wrote:
I think if you goto Onan or Byrant RV you can download the service manual and schematics

we do have an Onan expert who is a member and very helpful..
maybe he will see your post

did you run the generator and then measure the voltage with the Onan running
the pump will be controlled by the control board and there will be NO voltage unless it is running

could be there was a control board failure, and the MOD was done to avoid buying a new control board

Thanks for the reply, I havent measured the voltage from the K4 wire yet, but you confirm what i was thinking as well

Thanks for confirming for me that the FP is controlled by the control board

Wont be able to work on this until this weekend

I think if you goto Onan or Byrant RV you can download the service manual and schematics

we do have an Onan expert who is a member and very helpful..
maybe he will see your post

did you run the generator and then measure the voltage with the Onan running
the pump will be controlled by the control board and there will be NO voltage unless it is running

could be there was a control board failure, and the MOD was done to avoid buying a new control board