Ecm relay doesnt power up also fuel pump relay doesnt power up. Wired fuel pump straight and discovered no fire. Disconnected the computer harness plug and fire came back. Just bought a cpu from the junkyard with matching #. F6tf-12a650-bsa junkyard part number. The old one that was in my truck f6tf-12a650-aha am i missing something i need some help thanks.

 

Did your PCM come from a 94 f-350 w/ 7.5? There is no reason it should have fired up with the PCM unplugged. If it did, somebody really took some time, and a wire cutter to your harness.

 

Is your ECM relay working?