Hi I'm after some help on wiring up a external fuel pump

It's all in and wired up
Live from battery, ground to car chassis and wire to external pump

Just need to know what wire under the rear seats on a 2002 uk wrx Impreza is
The trigger wire

Anyone can help or have any pics please share with me

 

I wired my external bosch 44 to the fuel pump controller which is in the offside rear wing on my 03 blobeye wagon, access behind the inner boot panel. There are 6 wires running to the controller and from memory I think the negative is the black on the outside of the green, the switched ignition wire is (I think) black/white No5 if you count the black neg as No1 but best to check with a multimeter. So from your relay, 86 connects to controller neg, 85 connects to switched ignition. The pump primes and stops until the engine cranks just the same as the tank pump. This worked well for me but just need to double check neg and switch ign connections.
Trev