dalefuji,
Did you replace the gas line from the fuel pump to the gas tank?
If it ran when you primed it, you filled the float bowl with fuel and that allowed the generator to run for a short while. But with a leak in the line between the fuel pump and the gas tank, fuel can't be sucked up fast enough and the engine will stall.
One way to check is to take a line from the fuel pump into a separate gas container and see if the engine will keep running then.
Good Luck,
~Rick
2005 Georgie Boy Cruise Master 3625 DS on a Workhorse W-22
Rick, Gail, 1 girl (27-Angel since 2008), 1 girl (22), 2 boys (23 & 20).
2001 Honda Odyssey, Demco Aluminator tow bar & tow plate, SMI Silent Partner brake controller.