My Onan 5,000 will act up like that if there is a heavy load on at startup. If I turn off the converter, refrig, water heater and tvs it will start up fine and stay on after warm up. Just a thought. Does the 4000 have an altitude adjustment lever/dial?
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Jan and Rocky
Volunteers USFWS. 9,300 hrs each, 29 refuges. 04 Allegro 30DA, WH 8.1, Banks, 2012 Jeep Liberty , Brake Buddy Adv Select, 300watts Solar, "Philippians 4:11-13 KJV"
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