This fault code you have when the engine didn't run.
Fuel pump, I think - I'm not sure, only runs when you crank or run the engine. Only turn ignition on didn't switch the pump on (for some seconds) like on other cars.
Check the voltage to the injectors. You have on one side the 12V switched via relais (I remember that the V8 has 2 relais?) and on the other ground which is switched by the ECU.
When you have some sparks I thin think the ECU control ground (PWM signal) is ok and you will have some problems with the 12V voltage.
