Deadbolt24

I am looking for some help here, I've got a 1998 Z28 LS1 and when I bought it it had been sitting for about a year or so with the gas tank out and needless to say the inside of the metal tank was bad rusted and nasty so I figured the newer plastic would be the way to go so I got a super clean 2000 Z28 tank and installed it after cleaning all the lines on the car an changing the fuel filter. went to start it and only getting like 5 PSI and not throwing any codes any idea what I missed? need help. I even tried another PCM and didn't pump at all of course it wasn't flashed but I figured it would at least start till I got it flashed am I wrong in thinking that as it came out of a 1998 Z28 ? Any help would be greatly appreciated. I did a search of the forums and got nothing to help me but then I may have not asked the correct question.

Injuneer

What pump did you use.... the one that was originally in the 1998 (non-installed) fuel tank, or a new one? Did you clean the sock on the inlet side? Did you verify you have 12V at the harness connector above the rear axle.

Is 5psi an actual measurement or "like" some sort of guess?