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Old 06-06-2022, 11:13 AM   #1
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Dreaded code 36 on the generator.

Have the code 36 on my 10K diesel generator. Have replaced the fuel pump today and filter recently replaced. It Started after replacing fuel pump today and ran for almost a hour before shutting down again with code 36. Have tried everything I have read to get it running. Needing some expert advice please. If it's the CPU board how do I check it to make that determination? Really don't want to pay $700 for a new one until I know for sure that's the problem. Thanks
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Old 06-06-2022, 11:23 AM   #2
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As you probably already know, code 36 means it shut down without a command to shut down. That is usually not the board. I would start with dissembling the fuel filter. Check for rust particles. It will look like tiny brown or black sand. If none, look for sludge. If all that is good, remove the fuel cap and blow air back through the fuel supply line at the generator.
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Old 06-06-2022, 12:50 PM   #3
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The cause of your problem may be different, but we had an issue similar to what you described with the Onan 10K generator on our 2010 Tiffin Allegro Bus.

Replaced the fuel filter and the fuel pump, to no avail. When I replaced the fuel pump, I added an additional wire to the positive side and an additional wire to the ground side. Cut those two new wires long enough that I could easily "hot wire" the fuel pump to a solid source of 12 volt power. I found when I did that, the generator would run as long as I wanted to let it run.

After confirming the fuel pump receives its power from the generator's control board, I determined the voltage the control board was supplying to the fuel pump was low - 8 or 9 volts as I recall.

What I did from there and what I learned is summarized in the attached PDF file, which is a copy of a post I made on another forum.
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Old 06-06-2022, 04:53 PM   #4
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Thanks for the posts. Ordered a new fuel filter today should be here tomorrow. Don't think that's it but we will see.
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Old 06-07-2022, 04:39 PM   #5
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No new fuel filter. Can't get one. Started the generator with voltage meter connected to the fuel pump. Ran for about 20 minutes then died. Voltage was above 12 the whole time. Restarted it and ran for about 15 minutes with no voltage drop to the pump. Did remove the control board and cleaned it and the connector.
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Old 06-08-2022, 06:41 AM   #6
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Quote:
Originally Posted by LWBAZ View Post
The cause of your problem may be different, but we had an issue similar to what you described with the Onan 10K generator on our 2010 Tiffin Allegro Bus.

Replaced the fuel filter and the fuel pump, to no avail. When I replaced the fuel pump, I added an additional wire to the positive side and an additional wire to the ground side. Cut those two new wires long enough that I could easily "hot wire" the fuel pump to a solid source of 12 volt power. I found when I did that, the generator would run as long as I wanted to let it run.

After confirming the fuel pump receives its power from the generator's control board, I determined the voltage the control board was supplying to the fuel pump was low - 8 or 9 volts as I recall.

What I did from there and what I learned is summarized in the attached PDF file, which is a copy of a post I made on another forum.
I read your pdf and I'm having almost exactly the same issue. Sometimes it will start, other times not. If I reach in and hold/wiggle the connector, it will start and run... sometimes for hours, other times for only several minutes. If I go back and wiggle the connector, it'll start back up.

So, how does one get the control board out ? And , are there replacement connectors that can be purchased ?
thanks
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Old 06-08-2022, 06:54 AM   #7
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I read your pdf and I'm having almost exactly the same issue. Sometimes it will start, other times not. If I reach in and hold/wiggle the connector, it will start and run... sometimes for hours, other times for only several minutes. If I go back and wiggle the connector, it'll start back up.



So, how does one get the control board out ? And , are there replacement connectors that can be purchased ?

thanks
Not sure about the connector but you can get a onan control board thru Cummings or they sell aftermarket boards which are less expensive. Flight system sells them. The board that fits my generator is 695.00 from them. That's why I'm hesitant about paying out that kind of money for one till I'm sure it is the board. I've reached the point where I'm going to find a good mechanic to see if they can figure out the problem.
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Old 06-08-2022, 07:08 AM   #8
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Not sure about the connector but you can get a onan control board thru Cummings or they sell aftermarket boards which are less expensive. Flight system sells them. The board that fits my generator is 695.00 from them. That's why I'm hesitant about paying out that kind of money for one till I'm sure it is the board. I've reached the point where I'm going to find a good mechanic to see if they can figure out the problem.
I found the connector - 323-1819-01 ... I'll order on when I get to my destination and see if that helps.
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Old 06-08-2022, 07:16 AM   #9
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What is the fuel level in the tank when the generator quits? We've had the same problem with the same code on our 5,500-watt gas powered unit for a couple years. We went through the fuel filter, fuel pump, cleaning the carb, and checking all the visible fuel lines for cracks or soft spots.

In our case the generator will run indefinitely when the fuel tank is near full. As the fuel level gets closer to 1/2 it the generator starts having problems depending on how level the surface is we're parked on.

When the problem occurs, it sounds like the engine is running out of gas. It surges a few times then just dies. We've pretty much narrowed it down to the pickup tube in the tank. The problem right now is that the tank holds 80 gallons and is nearly full. It's going to be a beast to remove even when near empty.

In this case I'm strongly considering taking it to our local Ford truck shop to have the job done. I'm sure it won't be cheap, but they do have the equipment to do the job properly.
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Old 06-08-2022, 08:16 AM   #10
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I had a similar issue with an Allegro Bus throwing the same code. The issue turned out to be an inline fuel filter that was installed by Tiffin. No one knew it was there, so it was never changed. Traced the fuel line, found the filter and eliminated it. Problem solved. Won't cost anything to follow the fuel line from the tank just to verify that there is not another filter hiding out somewhere.
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Old 06-08-2022, 08:45 AM   #11
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Originally Posted by Hikerdogs View Post
What is the fuel level in the tank when the generator quits? We've had the same problem with the same code on our 5,500-watt gas powered unit for a couple years. We went through the fuel filter, fuel pump, cleaning the carb, and checking all the visible fuel lines for cracks or soft spots.



In our case the generator will run indefinitely when the fuel tank is near full. As the fuel level gets closer to 1/2 it the generator starts having problems depending on how level the surface is we're parked on.



When the problem occurs, it sounds like the engine is running out of gas. It surges a few times then just dies. We've pretty much narrowed it down to the pickup tube in the tank. The problem right now is that the tank holds 80 gallons and is nearly full. It's going to be a beast to remove even when near empty.



In this case I'm strongly considering taking it to our local Ford truck shop to have the job done. I'm sure it won't be cheap, but they do have the equipment to do the job properly.
I have a full tank. 150 gallon tank.
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Old 06-14-2022, 06:57 PM   #12
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filter

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No new fuel filter. Can't get one. Started the generator with voltage meter connected to the fuel pump. Ran for about 20 minutes then died. Voltage was above 12 the whole time. Restarted it and ran for about 15 minutes with no voltage drop to the pump. Did remove the control board and cleaned it and the connector.
Did You find a New fuel filter ?
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Old 06-14-2022, 07:52 PM   #13
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Did You find a New fuel filter ?
No I have not. Went yesterday to RV dealer close by and made appointment. Taking it in July 12th. Have run out of ideas. Did check when I replaced filter and only have 100 hours on this one. This problem has been going on for at least a year and half but finally can't get it to run for a hour before shutting down.
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Old 06-15-2022, 04:42 AM   #14
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No I have not. Went yesterday to RV dealer close by and made appointment. Taking it in July 12th. Have run out of ideas. Did check when I replaced filter and only have 100 hours on this one. This problem has been going on for at least a year and half but finally can't get it to run for a hour before shutting down.
What Dealer are you at ? Also do you know part # of filter you Need ? I can help you find one . I have a 12.5kw Diesel I have bunch of filters FP5888, Or Baldwin BF806, or GM 560355
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