[NJ346]

My buddy's LT1 camaro has developed a long start up problem. I checked pressure at the rail and noticed that it was taking a while to build up. I figured the pump was on the way out so on tuesday I replaced the pump with a Walbro 255LPH pump. When I took out the old pump I noticed that it had a pin hole in the feed line so I figured I had found the source of the problem...I was wrong.

Problem right now:
Brand new Walbro pump
Long initial crank
Fuel pressure is not holding at the schrader valve when key is turned off.
If I cycle the key to the run position anywhere from 3-5 times, I will hear a quick humm and then there is pressure at the schrader valve and the car starts right up.(Note: I hear the pump turn on everytime I turn the key to run so the pump is not the problem, there is an initial humm that has to happen for it to build fuel pressure)

I need to figure out why the fuel rail is not holding pressure shortly after the key is turned off. It sounds like some type of solenoid or possibly a fuel pressure regulator to me...any ideas?

This is definitely a fuel issue. I checked for spark and it has spark as soon as you crank.