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04-16-2017, 12:28 PM
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#1
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Junior Member
Join Date: Feb 2012
Posts: 4
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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.
Thanks,
Deryl
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04-16-2017, 12:54 PM
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#2
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Senior Member
Tiffin Owners Club Appalachian Campers Mid Atlantic Campers Coastal Campers Freightliner Owners Club
Join Date: Jan 2015
Posts: 1,622
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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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DaveB, Raleigh, NC
2015 Tiffin RED 33AA, w/Honda CRV
VMSpc, Magnum BMK/ARC50
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04-16-2017, 01:17 PM
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#3
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 5,932
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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.
__________________
1998 Pace Arrow 35 ft. F53 Ford V10 2014 Honda CRV toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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04-16-2017, 01:22 PM
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#4
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,783
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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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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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04-17-2017, 01:14 AM
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#5
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Junior Member
Join Date: Apr 2013
Posts: 15
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Could also be your oil level or the oil pressure switch.
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04-17-2017, 06:56 AM
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#6
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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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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Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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04-17-2017, 07:00 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Sep 2014
Posts: 4,569
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You might be able to find the service manual here;
Index of /~n0nas/manuals/onan
__________________
1996 Tioga Class C
2007 Monaco Diplomat 40 PDQ
TOAD 2012 Cadillac SRX 4
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04-17-2017, 07:16 AM
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#8
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Senior Member
Ford Super Duty Owner
Join Date: Oct 2014
Posts: 706
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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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US Army Retired - loving it in our Challenger 37TB.
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04-17-2017, 08:42 AM
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#9
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Senior Member
Join Date: Jul 2010
Location: FT on the Road
Posts: 3,839
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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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I don't subscribe to threads I reply to so will not see your reply to my comment. Drop me a direct message if you want a reply from me.
Cheers!
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