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Old 06-08-2015, 07:53 PM   #1
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Onan Generator Issue - 5500

Hi all -
So, we are on our 2nd year of camping in our MH, and have had a few issues with the generator the past few weekends. Worked fine when used last year (mostly when driving) running 2 AC's - drove in all types of weather (including high desert in E. Oregon) and never had an issue.

This year, we've been out 4 times, and run the generator at least a bit every time. The past 2, when it has been hotter (80-90+) we've been running it and about 20 minutes in, it shuts off. If you try to restart, it won't stay on more than a few minutes. We checked the error code - 36 (engine shutdown) so that's not particularly helpful.

After some research, the internet directs us to a fuel problem, either the filter, fuel line, fuel pump or some combination. Suggestion by the dealer was made to change the air filter and the fuel filter (since they are 3 weeks out for appointments right now) to see if that solves the problem. We're fairly handy but not engine experts.

Here's the fun part.....I can't seem to determine what the replacement fuel filter part # is......here is a picture of the label.

Here are the questions.....
  1. do we need 1 fuel filter or 2? What is the correct part #? Am I in over my head - is it harder than the dealer has indicated?
  2. What is the correct part #?
  3. Am I in over my head - is it harder than the dealer has indicated?
  4. Anyone else have a similar issue, and resolution to share??

Appreciate any insights anyone has - Thank you in advance!!!

Garren
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Old 06-08-2015, 08:16 PM   #2
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I don't own a generator, but here is the manual for your Model.
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Old 06-08-2015, 08:18 PM   #3
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You say you talked to your dealer so why not get those numbers from them. I'm going to ask the obvious. Have you checked the oil level?
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Old 06-09-2015, 12:55 AM   #4
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We did check the oil, first thing. The level is fine. When I talked with the dealer, I didn't have the exact model, so I was hoping someone else had experienced a similar issue and had done a replacement. I can call them in the AM with the info.
The manual we have, but it does not have the fuel parts or any instructions,as I think they expect it to be done at the dealer or device center, and being that it's 3 weeks until our appointment and they said it was pretty straightforward, I was hoping we could try it.
They have to replace the awning lights regardless, so she's going in, but if we fix the gennie it saves us some down time.
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Old 06-09-2015, 12:23 PM   #5
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My suggestion is to change the spark plug. I have had two generators that did the same thing and after a plug change the problem was solved in both cases. The first time it cost me over $100.00 to have someone else do it. The last time at cost me $6.00!
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Old 06-09-2015, 12:55 PM   #6
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Go to cummings web site and put in the model # on the tag the 5.5HGJAB-10378K they will be able to show all parts and filters for the unit for you. You can also order the parts from them.
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Old 06-09-2015, 12:57 PM   #7
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Gen

Might be a fuel pump vapor lock. Need to check all fuel line connections. Is pump located in the gen enclosure ?
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Old 06-09-2015, 01:06 PM   #8
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Also check your vehicle. Many have the fuel system plumbed so the generator will not draw fuel if the fuel tank is less than 1/4 full. (So you don't run it down and can't drive the MH.)
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Old 06-09-2015, 01:44 PM   #9
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I changed the fuel filter on mine no problem....Click image for larger version

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Old 06-09-2015, 02:30 PM   #10
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We have a 2014 Georgetown 328TS with the exact same model Onan gen. It ran fine the first year and half, boondocking several weekends. I had 580 hrs. on it when it stopped while boondocking on Derby Day weekend (May 2). We determined there was a fuel issue. After waiting couple of hours and priming for 40 seconds or more, it would start and run about 1 hr. and shutdown. Manuel said change fuel filter at 500 hrs. so I took it to Cummins dealer in Louisville and had it serviced including new fuel filter and spark plugs. Went on 6-wk western trip and tried it for first time in Iowa and it stopped after 30 min. Called closest Cummins dealer on our route in Sioux Falls, SD and fortunately talked to Dennis, their Onan serviceman. It said it could be fuel pump because he had seen several with this issue. Onan had changed pumps a couple of times in the last few years. Had them order a pump (P.N. A047N929) and it was there and installed the next day, all under warranty - no cost. Only lost 1/2 day on my trip. Can't praise Dennis and Cummins Central Power enough.
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