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Old 05-18-2016, 10:39 PM   #1
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THOR #1907
Generator issue need some advice

Just got our coach back from almost 4 weeks at dealer for another repair, (mirror). That is another story itself. I normally run the generator every month for half hour under AC load. Well, it was due the first week it was at dealer, the add another 4 weeks and now when I went start it, the generator will start and maybe run for 5 seconds most, then die. 7.5 hours on generator. Standard Onan RV4000.
Help, what sort of issues am I facing here? Any assistance will be greatly appreciated.

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Old 05-19-2016, 12:36 AM   #2
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THOR #1150
Check the fuel valve, is it open?

Onan did have a run of bad fuel pumps, but when the pump was bad they wouldn't start at all.
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Old 05-19-2016, 01:39 AM   #3
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THOR #1589
Mr Obvious is asking: You do remember that the generator won't run if the gas tank is below 1/4, right? That is to protect you from running out of gas.
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Old 05-19-2016, 01:41 AM   #4
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Was the repair for anything electrical. Are any of the breakers tripped. I believe the generator checks for any electrical faults and if it finds a problem it shuts the engine down so the problem may not be with the engine but either something in the system or the circuit board that controls the generator.
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Old 05-19-2016, 02:57 AM   #5
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THOR #3261
Maybe the wire connection to the oil pressure switch?
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Old 05-20-2016, 01:23 AM   #6
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THOR #1907
I have full tank of fuel, the repair was to replace drivers side power, heated mirror with lane change camera. Do not ever break one of those little dears. They are mongo expensive, when they are available. Factory had to build it as there was no available stock anywhere.

Don't think it is electrical, as we had it run for 5 seconds, my thought is gummed up carb. Will try to get carb cleaner in it when time permits. Gonna be gone,( without motorhome) until after Memorial Day.

Thanks for all of the suggestions. As progress is made, I will post.
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Old 05-20-2016, 01:36 AM   #7
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THOR #1469
I had a similar condition on my Forest River a few years ago. 11 hours on the generator and it wouldn't start. It was at the beginning of the run of bad carbs on the Onan generators. I believe it was a 4K or 4.5K generator. My dealer had me check a few things over the phone and then said bring it in for repair.

In my case I had exercised the generator under for 30 minutes one week prior to having the issue.
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Old 05-20-2016, 02:00 AM   #8
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THOR #1020
JRS950 - I think you've got a gas generator. I had a problem with ours and posted this fix that worked for me. It cannot hurt most is will cost is about $10 to find out. Here is the post from IRV2. Onan 5500 Generator Surging - iRV2 Forums
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Old 05-20-2016, 02:15 AM   #9
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THOR #3261
The oil pressure switch is designed to shut down the generator if it doesn't sense oil pressure shortly after startup.
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Old 06-25-2016, 12:44 PM   #10
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THOR #1907
Update from Cummins

The generator is covered under the 2 year warranty. Diagnosed and parts on order, due in 6/27 Monday. Should have it back next day. The off to dealer for slide that won't extend.
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