The 4Kw Onan in my 2004 Jayco Greyhawk would run for 15 to 30 minutes and then stop. It needed a new electric fuel pump. Once I saw the mechanic replace it, I think i could do it myself if it breaks again. It cost about $80. Check to see if your genny has a low oil sensor(mine doesn't). Sometime they give a false reading and prevent the genny from starting. Good luck.
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