So if I'm reading correctly, adding more fuel keeps it running until you stop adding fuel?
This would isolate it to a fuel delivery problem. Either the fuel rail has no pressure, or the injectors are not firing. The fact that it runs for a bit on the cold start valve indicates pressure in the rail.
So that leaves injectors not firing. Someone (Karl?) mentioned making sure the fuel rail ground was hooked up. Has that been verified? In turn, that will need a good ground, so was the engine to chassis ground strap disturbed in all this?
If the grounds are good, then the answer is somewhere in the fuel injection troubleshooting guide. Sure sounds like the injectors are not firing, so I am betting it is a wiring issue somewhere. Something is not reconnected.