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Old 06-03-2013, 01:48 PM   #1
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Onan 5500 Quits after few minutes

Looking for some help on an Onan Marquis Gold 5500 Generator
It starts and runs for a few minutes, then stops and won't start again until it's cool down. I can't see where it would get that hot that it shuts down from overheating. It shuts down with or without a load on it.
What should I check or look for?
Thanks for any help you can give.
Joe
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Old 06-03-2013, 03:59 PM   #2
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Does it run off of gas or propane. If gas it could be vapor lock. Open the gas cap and try to start again.
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Old 06-03-2013, 09:33 PM   #3
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Thanks I'll try that. And yes it is gas...

Joe
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Old 06-04-2013, 07:19 AM   #4
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Hi Again, As they say, Back to the drawing board.
Tried it, that didn't work.
Open to whatever may be next.

Joe
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Old 06-04-2013, 07:24 AM   #5
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Hi Again, As they say, Back to the drawing board.
Tried it, that didn't work.
Open to whatever may be next.

Joe
Could be the float in the carb is sticking or a gas line is collapsing.
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Old 06-04-2013, 10:28 AM   #6
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Could be the float in the carb is sticking or a gas line is collapsing.
I agree or check for a fuel filter. One other thing have you been putting fuel in that contains ethanol. That will give you problems. If you have get a bottle of sea foam and poor it in your tank and keep trying to run it. Probably needs a good cleaning. Pull out the spark plug and check the gap and clean it maybe replace it.
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Old 06-04-2013, 12:39 PM   #7
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Thanks Again, I'll try all of the above, but boy it was running great just before it became a piece of _ _ _ _ you can fill in the blanks. lol

Joe
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Old 06-04-2013, 12:55 PM   #8
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Those generators are known to have a crappy fuel pump. I had to replace mine with a Mr.Gasket low pressure pump from Oreilly's. As soon as I put that on, it has run like a dream. Do not buy a factory fuel pump as it will have an issue too not long after you put it on. Also buy a can of Onan Decarbonizer spray and follow the instructions and it will clean up the pistons and combustion chambers nicely and it will run like a dream!
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Old 06-04-2013, 03:16 PM   #9
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I have a similar problem, except mine starts but only runs for about 5 seconds, spitting clouds of smoke, then quits. When I first got the rig, using the prime button only caused the fuel pump to click for maybe two seconds. Now it clicks for as long as I hold the button down.

I suspect that either the float no longer floats or the float valve is not shutting off. My fuel pump is a new one from NAPA, specifically a 4 psi max pressure for carb-equipped engines, and the filters are new.

More detective work needed!
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Old 06-04-2013, 03:27 PM   #10
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Broken fuel pump wire

Check for broken wire. I had similar problem, tried all the usual fixes (such as spark plug/wire replace, fuel filter replace, etc.). Finally found it to be a broken wire from the electric fuel pump.
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