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Old 04-16-2017, 01:28 PM   #1
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Onan QG5500 Help Needed

Hi, we have a 2013 Thor Windsport 32A. We have an Onan 5500KW generator. The generator quit running while on a trip. It will start up, run maybe 15 seconds then quit. I replaced the fuel filter, air cleaner, spark plugs, and changed oil and filter. Same thing. Might run a few seconds then quit. Is there a way to reset the cut off switch? That is all I can think of that might be keeping it from running.
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Old 04-16-2017, 01:54 PM   #2
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How much fuel do you have? Many coaches have the fuel pickup arranged in a way where it won't work below 1/4 of a tank of fuel, to keep you from becoming stranded from running the genny.
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Old 04-16-2017, 02:17 PM   #3
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Start the generator. As soon as it stops, take the fuel line loose at the carb. If it does not squirt fuel out, you have a fuel pump problem. To see if the problem is in the board, run a hot wire to the fuel pump. If it stays running, the board is not signaling the pump to to keep running.
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Old 04-16-2017, 02:22 PM   #4
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If your Onan 5500 is like our Onan 7500 it will show a trouble code after it shuts off. The light on the switch flashes a specific sequence to let you know what's wrong. Check your manual on this.
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Old 04-17-2017, 02:14 AM   #5
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Could also be your oil level or the oil pressure switch.
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Old 04-17-2017, 07:56 AM   #6
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I had a 5500. Several issues will give the symptom, as it starts then senses something it dies not like and shuts off.

Fuel pump is a common problem. Relatively inexpensive and easy to change. On mine, the oil level had to be up to the tippy top, not just full per the dip stick - else the low oil sensor would shut it down. I also had to replace the brush set.
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Old 04-17-2017, 08:00 AM   #7
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You might be able to find the service manual here;

Index of /~n0nas/manuals/onan
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Old 04-17-2017, 08:16 AM   #8
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deryld - we had a similar problem. Check the number of hours you have on your generator. Cummins related to me that brushes are good for 900-1000 hours. Check my post here - it might help. Onan Marquis 5.5 Generator Brush Replacement - Thor Forums
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Old 04-17-2017, 09:42 AM   #9
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I have the 7000 and it drove be bonkers for a few days. I didn't put 2 and 2 together. Silly be had the gen oil changed by a Ford dealer. They did not take the time to fill it properly. It would start but shut down after less than a minute.
After checking everything the other members suggested above I also checked the oil level. It wasn't even reading on the dip stick. A phone call later to the Ford dealer and a trip to get the oil for free I added the oil (very very very slowly) and have not had a problem since.
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