That wire is battery power for the ECM and I can't tell you what the PCM is doing on the inside.
You could check the fuel pump relay wire coming out of the PCM to see if it is sending power to the relay.
Also not sure on the VATS/Security side of things and if any of that could be telling the PCM to not turn on the pump.
Do you have this connector? It would be red, and will turn the pump on with 12V straight to it. That will tell you outside the PCM is good to the pump.
http://shbox.com/1/fuel_pump_prime.jpg

