The Onan on my 1999 Adventurer would run a short time and shutdown. It would not restart for an hour or more. On this forum I read the possible cause was the fuel pump. One poster stated his generator would run in the driveway but not while driving. This was caused by a weak fuel pump. I had also read that the oil sending unit may be the problem. I changed the send unit but it did not fix my problem. I the crossed the Onan fuel pump number with an Airtex fuel pump (exact match). I replaced the pump and the generator worked as it should. Hope this helps.