ok now that i am half awake,
-Pin 30 is power in from your amp power wire
-Pin 87 is your power out ( this goes to the positive side of the fuel pump)
-Pin 86 can be connected to the earth trigger, or if its positive trigger connect 86 to the chassis
-Pin 85 can be connected to the positive trigger or if its negative trigger connect this to a switched ignition 12v source
-then connect the fuel pump earth to the chassis,
doing this will give the fuel pump full battery voltage, but still be controlled by the ecu incase of an accident where the engine stops the fuel pump will stop, and wont pump a tank load of fuel all around the car if the line is ruptured