Class C Onan Generator Exhaust Stack Issue

Thanks! I mistakenly said we replaced carburetor & it was the fuel pump & fuel filter. After replacing those the generator ran like a kitten. We went tailgating for 2 days & nights & generator would run for up to 3 hours. The problem was intermittent. We got home, I ran the generator for 2 hours while cleaning & reading for next trip, no issue, so I don’t think it is the new fuel pump or filter. The only thing different than when we ran it after replacement of pump & filter, was the stack & the oil showed a little low, we had topped it off. We have been advised to remove a pint of oil, dipstick level should be just above low mark. When oil heats up, expands & too much oil may be the issue. If it dies & restarts after 30 mins or so, gives oil time to cool back down. Makes sense. Will post if this helps.