We have Onan 4000 with around 150 hours on it. Have serviced it as manual says. Ever since day 1, I have to prime it for 1 full minute. A slow count to 60. Hit start and it fires right up. This is the case even if I ran it for 6 hours while driving, turned it off when got to campground. And started it up next morning. The prime light stays on the entire time I’m holding the switch down. Count to 60. Starts right up. My fuel tank is in rear. Gen is up front in compartment behind propane on drivers side.
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