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Old 08-31-2015, 03:56 AM   #1
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1999 Georgie Boy Onan generator problem

i have a 1999 Georgie boy that has an ONAN 5.0 BGE generator.
the generator will startt and run for 30 minutes then it stalls out.
i have to wait for hours for it to cool off before it will start again. then the same symptoms.
i have replaced the carburetor and the oil pressure switch. is seems to be overheating and shutting down.
i have removed the front cover to check and see if some rodents had built a nest, but therer was nothinbg in the cover.
any help would be appreciated.

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Old 08-31-2015, 04:22 AM   #2
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Sounds like a coil to me

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Old 08-31-2015, 05:45 AM   #3
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Back in the day when these things were new, some multi grade oils would cause them to act like that. Switching to straight 20 or 30 wt. eliminated the problem.
1997 37' HR Endeavor, 275hp Cat, Freightliner
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Old 09-02-2015, 03:30 PM   #4
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You say you think it's overheating? What indicates this to you??? I'd look for a fuel supply problem....as in replacing the fuel filters (there are two of them) - Then I'd be sure the air filter is new, these solutions way before I'd replace the carb.
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Old 09-02-2015, 04:55 PM   #5
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Originally Posted by Poohbear7278 View Post
Sounds like a coil to me
Definitely a possibility.
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Old 09-02-2015, 05:52 PM   #6
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Originally Posted by denforent View Post
I'd look for a fuel supply problem....
I would too--- but I'm leaning towards the pump. Old diaphragms can get weak and stretch while being used, to the point they won't push fuel until they cool...

Try this: when you start the genny, put your hand on the pump. You should feel it 'thumping' intermittently. "Intermittently" is the key, as it should NOT thump continuously, as it should hold pressure for a few seconds between pump cycles.

If it's intermittent, then check it again after 45 minutes of running, and note if the 'dead spaces' are closer together or thumping continuously.

If it EVER pumps continuously, it's not building pressure and needs to be replaced...
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Old 09-03-2015, 06:26 AM   #7
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Perhaps the over temp sensor? also check the fuel line routing. I had an onan that had a problem with fuel boiling in the line after it ran a while. Line was run to close to heat source.

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generator, onan

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