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im cam, a licenced diagnostic tech.this can be a bit of a tricky one to answer, so i will do my best as if i was looking at it myself.there was a tsb on these for internal fuel pump wiring and it rubbing on the clamp inside the fuel tank, but you have replaced the pump so this eliminates this.we have 2 options on this.
1. open the harness from to fuel pump relay all the way through the firewall under the panels to the fuel pump assembly and look for a wire that is chaffed.
this is what i think the problem is, but it is very time consuming to find it.
2. run a new wire from the fuel pump relay straight to the fuel pump.
I can give you the wire diagrams for the fuel pump circuit if it will help you