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Old 06-12-2019, 05:48 AM   #1
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Diesel Onan Intermittantly Shuts Off - Code 36

For the last year or two the Onan 12.5 HDKCB Spec B Intermittently shuts off with code 36. Sometimes it will restart immediately and sometimes it will start hours later but in the end it starts eventually - so far. I do not think it is a fuel issue as I have tested it and replaced the fuel pump and filter on principal, good flow and no air in the line that I saw.
Onan Service manual says after checking fuel, #7 is testing the 333-0707 Governor Actuator (haven't done that yet) and #8 is Replace the 300-5961 Control Board.

Anyone have experience with this problem?

I do have the current Manuals, Service, Parts, etc.
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Old 06-12-2019, 06:52 AM   #2
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Just curious what code 36 is?
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Old 06-12-2019, 06:59 AM   #3
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Below is a cut and paste from a Internet search...


"Fault #36 happens when the engine stops running due to a reason unseen by the controller /inverter unit.

The most common cause of this is running out of fuel , so you may want to replace the fuel filter as a first step.


The next thing I would do would be to run the genset with a shortest possible length of fuel hose drawing clean fuel from a fuel can. We need to try to isolate the problem from the coach. The fuel lines on the coach could be sucking air , or there could be a broken pickup tube inside the coach fuel tank.

The electric fuel pump could also be the problem. If the genset still quits running with the fuel container setup , I would suspect the electric fuel pump.

A defect in the controller/inverter could also cause this , but they are expensive to replace , and not the most likely."
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Old 06-12-2019, 07:18 AM   #4
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Quote:
Originally Posted by BigLar368 View Post
Just curious what code 36 is?
"Genset Stopping Without Fault Condition - Code 36
(The Controller declared this fault because engine speed fell below 1000 RPM for 0.5 seconds, though not by controller action)"
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Old 06-12-2019, 07:31 AM   #5
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Had a similar situation with my previous Allegro Bus. Tiffin installed an inline fuel filter on the coach that was not documented anywhere. Found it and removed it. Generator ran fine after that.
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Old 06-12-2019, 07:50 AM   #6
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When I was younger and a lot dumber, I made the horrible mistake of buying a Thor MH, code 36 plagued me every single time I used the MH. Turned out my fuel was vaporizing in the fuel line due to heat. Thor had zero solutions to the problem. Thanks to this forum, about 10 of us who all had the same problem started trial & error solutions to solve the problem.

After a lot of work, we found a solution, adding a $25 in line fuel pump between the fuel tank and the generator to help push fuel to the generator. The basic issue was the fuel pump on the generator was sucking fuel from the fuel tank, but it really was not a strong pump, the heat generated running the generator and outside temp heat would vaporize the fuel in the line causing it to basically boil, the air bubbles would get into the line and the generator would stop.

Bottom line, after spending countless hours on phone with Onan, code 36 is 100% a fuel related problem. You either have a clogged fuel filter, your fuel pump is bad or going out, a crack in your fuel line, or your fuel is vaporizing due to heat. Trouble shoot your issue from fuel tank to engine and you will find your problem.
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Old 06-13-2019, 04:20 AM   #7
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Being that you have already changed out the pump and filter I would start looking at the pick up tube in the tank. It may have deteriorated or even broke off. Not sure about your RV but ours (2004 Camelot) has fairly easy access to the top of the tank. Would not take much time to look at that.
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