Onan 4000 shutting off after 20 min.
Have an Onan 4000 300hrs in a Class C. If I'm sitting still it will run about 20 minutes then sputters and sounds like it's running out of gas and shuts down. If I wait a while it will start back up a...
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I think by far the most common cause of this on these generators is the fuel pump dying such that it doesn't work properly when hot. You may be able to verify that by comparing the sound it makes in priming mode (holding the control switch in the off position when the generator isn't running) when it's cold vs. when it's hot and has just died. Most, but not quite all, versions of the 4KY have the prime function.
While ignition system components can also get temperature sensitive, and that's not unheard of, it's not anywhere near as common as the fuel pump, from what I've been able to suss out.
While ignition system components can also get temperature sensitive, and that's not unheard of, it's not anywhere near as common as the fuel pump, from what I've been able to suss out.
