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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Sounds like a vapor lock situation. Check the routing of your fuel line on the suction side of the fuel pump to make sure it is away from heat sources. Also check it for possible cracking where the pump could be sucking in air.
