99 suburban fuel pressure problems

I installed a new carter fuel pump in my 99 suburban. Two days later I cant get any fuel pressure built. I unhooked the return and turned the key on/off no fuel came out of the line which leads me to think the pressure relief valve is good. When I installed the new pump it came with a wiring conversion kit. The tails on the new wiring harness were pretty long so I cut them a bit, but I left more slack so I could hook the harness up easier than unhooking it was. Could the extra wire screw with the pump, or was I lucky enough to have just gotten a B.S. pump? P.S.I is only at 51 +/- 2 lbs.