ok so we have swapped an engine & pcm from one vehicle to another... both were LS1B's and pretty much simple straight through swap.

I have re-linked the VATS & updated the VIN number. We can't seem to get the fuel pump relay to engage with key-on like it should.

The car runs & drives fine if we bridge the fuel pump relay coil.

Have i missed something with the PCM change process? Have done pcm swaps before without any issues.