The BOA ecu controls the prime up of the fuel pump.

Just use a 4 pin relay (cant remember the numbers off my head)

fuse a wire from the battery + to the relay
wire relay to pump
ignition live to relay
pin 22 ecu to relay

Pin 22 is an earth thats swiched on and off by the ecu so that works the relay for the fuel pump basicly it will prime and stop when the ignition is switched on and will run constant as soon as you start to crank the engine over.