fuel problem HELP!!!

[mattc]

when i try to start the truck it runs for a few seconds under moderate throttle then the fuel pressure drops and it dies.

its a new harness
new walbro 255 pump with ractronix hotwire kit
using an autometer gauge

when i turn the truck on it primes to liek 49 psi when i crank it starts to drop and sometimes will run 2-10 seconds then the pressur drops to about 20 psi and it cuts off. if i leave it on after priming while not trying to crank it sits there and creeps down maybe 1 psi every 10 seconds or so. could the regulator be bad?

before i pulled my old motor i ran it with this pump and it seemed to hold up fine but under high boost i was having pressure drop so i dont know where to start really.

i wouldnt think a brand new walbro would be bad?

need some help on this one

edit: its also smells like its pumping out a good amount of fuel when it is running