hi guys I have a P1 that im have trouble with . basically the fuel pump is not working I have removed the pump and tested on bench with 12v battery and its fine . I have found the fuel pump relay under the dash and can hear and feel it click when ignition is turned on I have checked all fuses and they are fine I have not tested the relay to see if it actually is working but this may have to be my next job ? does anyone know where the feed is for this ? also could the immobiliser be causing this ?

 

Yep Immobiliser is big culprit. Trace wiring from under dash to pump you'll see skinny immobiliser wire spliced into thick fuel pump wiring. Remove it and bridge the immobiliser wiring. Immobiliser will still function by preventing starter turning over.

stupid skinny wiring burns out relay in the immobiliser unit and it aint repairable

 

black box under rear seat (drivers side) make sure it's not corroded up inside

 

This ^^^
And also the White connecting block on the fuel pump(top of tank) can corrode too

 

Under rear passenger seat is my vote. It'll take two mins to take the seat up and have a look at the little melted black box.