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Old 07-08-2022, 12:03 PM   #1
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No 12 volts going to generator fuel pump

Have a 10k diesel generator in 08 madp. What would cause no voltage going to fuel pump. Have looked for a fuse and found nothing. Pulled out the K1 relay and it tested good. Cleaned the relay, start switch and connections at the pump with electric cleaner. Tested continuity at the fuel pump connectors. Could use some help please.
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Old 07-09-2022, 07:35 AM   #2
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Originally Posted by patrickemb View Post
Have a 10k diesel generator in 08 madp. What would cause no voltage going to fuel pump. Have looked for a fuse and found nothing. Pulled out the K1 relay and it tested good. Cleaned the relay, start switch and connections at the pump with electric cleaner. Tested continuity at the fuel pump connectors. Could use some help please.
I suggest finding the Owner/Service manual for your generator. You didn’t mention what make/model of generator it is so can’t help much beyond that.

It’s possible the information might be in the “Files” section of this site. 😀
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Old 07-09-2022, 08:03 AM   #3
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It's a HDKCA series B 10k diesel. I have googled the problem and found nothing for diesel generators. I have the manual for parts and install. No information in them about this problem.
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Old 07-09-2022, 08:18 AM   #4
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The 12 volt signal is sent from the control board. Control hosts is in the lower front. You can remove the coolant reservoir and follow the wires to plug. Try to unplug and plug back in. This might get it reset. If not, need to replace that board.
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Old 07-09-2022, 08:33 AM   #5
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Try this manual, electrical schematic is at the end.


EDIT: From the manual "Over crank - No.4"
2. Prime the engine fuel system for one minute (p. 2-4).If the fuel pump does not operate, check for loose wiring harness connectors E2-1 and E2-2 and reconnect them to the pump. If they were found connected, disconnect them and power the pump directly with a 12 volt battery. Replace the fuel pump if it does not operate. If the pump operates, disconnect P1 from the control board (p. 11-1) and check for wiring continuity in the harness between connectors P1-24 and E2-1 and for ground continuity at connector E2-2. Repair as necessary. Make sure connector pin sockets are not damaged or corroded and that they are fully seated and can’t be pulled out. Replace the control board if the fuel pump still does not operate.
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Old 07-09-2022, 10:00 AM   #6
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Try this manual, electrical schematic is at the end.


EDIT: From the manual "Over crank - No.4"
2. Prime the engine fuel system for one minute (p. 2-4).If the fuel pump does not operate, check for loose wiring harness connectors E2-1 and E2-2 and reconnect them to the pump. If they were found connected, disconnect them and power the pump directly with a 12 volt battery. Replace the fuel pump if it does not operate. If the pump operates, disconnect P1 from the control board (p. 11-1) and check for wiring continuity in the harness between connectors P1-24 and E2-1 and for ground continuity at connector E2-2. Repair as necessary. Make sure connector pin sockets are not damaged or corroded and that they are fully seated and can’t be pulled out. Replace the control board if the fuel pump still does not operate.
Thanks. I'll let you know what I find out .
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Old 07-10-2022, 08:47 AM   #7
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The 12 volt signal is sent from the control board. Control hosts is in the lower front. You can remove the coolant reservoir and follow the wires to plug. Try to unplug and plug back in. This might get it reset. If not, need to replace that board.
Bobby is right and unfortunately control board issues on Onan 10K & 12.5K generators are not uncommon.

An easy test IF you can get to the fuel pump (it's located toward the lower back end of the generator on the driver side of the coach) is to use two additional lengths of wire to hot-wire the pump to a solid source of 12 volt power.

Easier than that is to jiggle the multi-wire connector where it connects to the control board while trying to prime the generator. If you hear the fuel pump start running when you do that, your problem is the control board.

Some owners have been able to resolve the problem by disconnecting the wire connector, spraying contact cleaner on the pins on top of the control board, then re-seating the connector. That didn't work for me when I had the problem with a 10K generator in a previous motorhome, so I ended up having to replace the control board.


Below is a photo of the original control board from that generator, which will provided a view of the pins to which the connector is attached.
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Old 07-10-2022, 09:24 AM   #8
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Going to check the #24 pin for continuity to the pump. Have sprayed electric cleaner to all the affected connections. Just about to say it's the board.
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Old 07-11-2022, 08:37 PM   #9
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Had continuity to the 24 pin. Guess it's time for a new control board. Glad I don't need my generator soon. Give me time to save up for that expensive board.
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