Best advice I can offer is to give Kev a call since you've used one of his wiring looms. He is a wiring guru and helped me out when I got stuck....but a check of the relay could be worthwhile too if your not getting power to the injectors. Can you at a minimum swap the working fuel pump relay with the injector relay and see if you still hear the pumps prime. Don't know if this would cause it but do you have an earth lead off the ignitor box and have you pulled the fuel inlet hose off at the fuel rail to confirm fuel is getting up to the motor?