No power to fuel pump relay

Trucks been sitting in garage uncranked since the early fall. Battery was dead and would not take a charge so I replaced it. Engine turned over but would not run. Will start and run if you feed fuel into the intake. Checked the fuse to the fuel pump and it is good, replaced it anyway. Swapped fuel pump relay with PCM relay as they are identical. Both work on PCM but not on fuel pump. Checked roll over kill switch in passenger floor board. Did not seem to be tripped, jumpered out the switch at the plug but no change. Not sure what to check next other than dismantling the fuse panel and then chasing down the wiring?