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New Onan 4000 watt gas RV generator cuts out

Hi have a 4000 watt gas rv generator thats about 2 yrs old with only about 40 hours on it. It runs perfect in the driveway (sea level) with the AC full blast but when we took it out last weekend 105 degrees and 2,400 foot elevation it would run for about 5 minutes cut out. However when the generator would shut down we would could smell raw gas. I checked the fuel line all the way from the tank to the engine and no leaks and check the carb manifold to see if there were any air leaks but could find nothing. Only seems to die when the AC is on in the heat? Can figure it out?

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  • chyenviro Jul 07, 2009

    Hi Protek480,

    That makes more sense, kinda what I thought it may have been but wasn't sure. I'll contact Onan and see if they had a jet kit. Thanks really appreciate the help!!!


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The generator engine is jetted for sea level. When you run at 24 hundred feet, it's flooding out. That's what you smell. The carb will need to be jetted for high altitude.

Posted on Jun 30, 2009

  • Craig Butler
    Craig Butler Jul 07, 2009

    Some Onan units actually have an adjustment knob you can set for different altitudes, depending on your model.


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