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Onan generator shuts down after 5-10 minutes


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  #1  
Old 07-02-2010, 05:02 AM
rgraffeo rgraffeo is offline
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Default Onan generator shuts down after 5-10 minutes

I have a Onan 4.0 BGE/FA 261100P generator.
It runs abour 5-10 minutes then surges & shuts down either with or without a load.
I replaced the coil (had a weak spark), fuel filter & new carb(was running rough).
I've jumped out the fuel pump & even tried running it off a gas can but still stops.
Check the valve backlash & checked the cylinder compression, both were 130#.
When the motor shut down we checked the spark & it was a good blue spark.
At the coil we never lost voltage, stayed 11.85 volts.
Also jumped out the oil pressure switch without luck.

Does anyone have any suggestions to the cause?
Thanks
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Old 07-02-2010, 09:10 AM
bobbyz72 bobbyz72 is offline
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Default Re: Onan generator shuts down after 5-10 minutes

IF you know you have spark when the engine dies, then what about air, make sure the choke is not closing. If thats not it... you have a fuel problems. Try a new fuel pump, i had the same problem few weeks ago, drove me crazy trying to figure out simple problem, because the fuel pump would pump when i disconncted the line.
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Old 07-02-2010, 11:14 PM
Ben Cowan Ben Cowan is offline
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Default Re: Onan generator shuts down after 5-10 minutes

You might also consider replacing fuel hoses. Our great gasoline with alcohol often causes many fuel lines to deteriorate rapidly when gas stays in lines. I recently reviewed a 2006 manual for a subaru robin engine, they recommend changing fuel lines yearly. Could you be pulling a vacum on fuel tank? Plugged vent can be hard to find. Luck, Ben
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Old 07-02-2010, 11:35 PM
rgraffeo rgraffeo is offline
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Default Re: Onan generator shuts down after 5-10 minutes

Guys thanks for the help.

I already changed the fuel hose going to the fuel pump. I took off the gas cap & blew low pressure air into the fuel tank to insure the metal line to the tank did not have pluggage.
I made up a pressure gauge so tomorrow I can test the fuel pump pres to make sure its not pumping too much. I was told the fuel pump should put out 3-5 psi.
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