If "Gas" means Gasoline then the issue is simple, fuel starvation. The demand is more than the onan fuel pump can handle. The gas tank may be too far from the gen and fuel pump can't pull the fuel fast enough anymore. Toy haulers are famous for this problem, they put the gas tank in the back of the RV and gen is in the front. The best solution if this is the case is to put a fuel pump back near the tank and eliminate the Onan fuel pump completely. I've had to do this many times for folks who have this very problem. Good Luck
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Retired 2020.
46 Years RVing and no end in sight.
2018 Ram 3500 SB Limited, CC, 6.7/Aisin, 4X4, SRW. Comfort Ride Energy Absorbing Hitch.
2020 Cedar Creek Hathaway 34IK, Reese 19K Sidewinder PB.
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