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09-03-2017, 09:43 PM
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#1
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Junior Member
Join Date: Sep 2017
Posts: 4
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Onan diesel Generator fuel code 36
Hello all! I'm new here so, please forgive me if I've posted in the wrong section. I've got an Onan model 12hdkcd diesel generator that has been giving me some troubles. Sometimes it runs for 36 hours straight, other times, it may run for 15 minutes and shuts off.. I'm getting a fuel code 36. I took it to Cummins in Nashville Tn and, after letting it run for a total of 16 hours or so, it finally quit on them. They "thought" it was the fuel pump. A new pump was put in and I was sent on my way... 30 minutes down the road and it was doing it again. This weekend we had our rig out and it ran great for 20hrs, then it started shutting off. Doesn't matter if it's under a load or not. Now, I'm making my way back to Nashville and It doesn't want to stay running at all. It is intermittent and frustrating. If anyone has any ideas what to check before I send her back into cummins would be greatly appreciated.
Thanks,
Jim
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09-03-2017, 10:33 PM
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#2
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2006
Location: MotherLoad foothills approx.60 m.s east of Sacramento
Posts: 1,281
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__________________
Full time since Nov 2012 RVM#41 Gary and Marian Hill 2001 Monaco Dynasty Jack 38' 370 hp ....If it ain't broke I can still fix it.
Like putting shoes on an octopuss, so are the days of our lives.... 
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09-04-2017, 06:27 AM
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#3
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Senior Member
Monaco Owners Club
Join Date: Jan 2008
Location: Olympia, Wa
Posts: 2,772
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Anyone change the fuel filter? Or check fuel flow from tank?
LEN
__________________
2004 Clss C 31' Winnebgo
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09-04-2017, 09:52 AM
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#4
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,780
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Hi Jim!  Welcome to IRV2! We're sure glad you joined the gang! 
Sorry I can't be any help on the genny! Keep her between the ditches!
Good luck, happy trails, and God bless!  
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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09-04-2017, 12:09 PM
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#5
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Junior Member
Join Date: Sep 2017
Posts: 4
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Quote:
Originally Posted by adamfolger
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Yeah man, I googled the hell out of it and while the symptoms are similar, the solution doesn't be seem to be the same. Like I said, I've had it at cummins for the repair and the replaced a fuel pump that wasn't the issue.
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09-04-2017, 12:11 PM
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#6
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Junior Member
Join Date: Sep 2017
Posts: 4
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Quote:
Originally Posted by OLYLEN
Anyone change the fuel filter? Or check fuel flow from tank?
LEN
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When the problem first started a few months back, I had just put a brand new fuel filter on. So, I switched it out immediately. Did not fix the problem. Tomorrow, I am going to check fuel flow from the line. I am starting to thing something is clogging the line.
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09-04-2017, 11:44 PM
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#7
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2006
Location: MotherLoad foothills approx.60 m.s east of Sacramento
Posts: 1,281
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Pull the fuel in line and draw fuel straight from a fuel can and if all is well you have a fuel line issue. Blow it out with an air hose.
__________________
Full time since Nov 2012 RVM#41 Gary and Marian Hill 2001 Monaco Dynasty Jack 38' 370 hp ....If it ain't broke I can still fix it.
Like putting shoes on an octopuss, so are the days of our lives....
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09-06-2017, 07:31 PM
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#8
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Junior Member
Join Date: Sep 2017
Posts: 4
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UPDATE: Pulled the fuel lines out and checked everything, The brand new Fuel pump was pumping just fine. Then, it stopped pumping completely. Keep in mind, this pump is only 3 weeks old with only 100 hrs on it. We pulled out the PCB and it looks as though one of the capacitors has blown  . So, For temporary fix, I've installed a three was switch to the fuel pump. 1 is off, 2 goes through the PCBm and three is just a direct on to the pump. works while I find the best price on one of these boards. the ones for my Gen are pretty darn pricey.
So, that seems to be the problem/fix for now. Taking it out for the nest 4 days so I hope she stays running. The downside is I paid Cummins (too much for a simple pump) to fix the problem and all they did was replace a pump that was working just fine.
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07-17-2018, 05:08 PM
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#9
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Junior Member
Join Date: Oct 2014
Posts: 9
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onan 12hdk runability issues
Jim-
I have the same/similar generator and am having similar issues...I have replaced the fuel lift pump, filter, relays, oil pressure switch, changed the oil/filter, blown out the exhaust sensor, etc. and appear to have good flowing diesel from the tank. When running, its sounds fine. However, it will bobble and then gets shut off per the code 36 warning because it fell below the minimum rpm. Does not give any other codes. Problem has now gotten worse to the point it will only run for a few minutes before shutting off with same error code.
If you don't mind, what type and year coach? What is the "PCB" and where to look at it? Did you find another?
Mine is a 2008 travel supreme limited with 1200 hours on the gen set. Up until 2017, the thing never skipped a beat even with 3 ac units running along with other items in 100 degree heat for hours/days on end. However, over the last year we have been chasing our tail on this issue and neither the wife nor dog are very happy when the AC does not work in the summer... You know you have a problem when the dog is unhappy!
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07-22-2018, 08:16 PM
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#10
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Junior Member
Join Date: May 2015
Posts: 2
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Hey Mmcnw,
I too have this problem.
Generator has trouble staying running. It might start and run for a couple seconds, barely turn over 1 time, or run for several minutes before I shut it down. I just replaced the fuel pump.
When it does decide to stay running I am not getting any voltage output.
I get code 45 and 36 sometimes.
Any luck on your end?
I too am wondering where the control board is.
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07-23-2018, 11:21 AM
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#11
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Junior Member
Join Date: Oct 2014
Posts: 9
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Nothing yet - have you tried replacing your fuel pump relay?
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03-11-2021, 06:09 PM
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#12
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Member
Join Date: Jan 2021
Posts: 63
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code 36
Mine is doing the exact same thing and setting code 36. Did anyone ever figure it out?
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03-12-2021, 03:02 PM
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#13
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Member
Join Date: Jun 2014
Location: Massachusetts
Posts: 96
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Onan diesel Generator fuel code 36
Hello, I have an Onan 55oo gas generator and have gone through all the different possible problems. Replaced the fuel line, checked to see if fuel was bad, replaced the fuel filter, rebuilt the carburetor all with no good results. I then replaced the carburetor and she purred like a kitten. So my advice to you is, spend $60 and replace the carburetor.
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03-13-2021, 02:40 PM
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#14
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,750
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Diesel generator doesn't have a carburetor  !
__________________
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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