Originally Posted by fezzie2
theoretically if i connect a battery live to pin 1 with the ignition on, should the fuel pump start working?
No it won't. it needs a pulsed input as i said. Red is permanant live, black is ignition live, brown earth, red and black goes to fuel pump, but that pin also supplies the aux air device.
The relays do give up, do it could well be faulty.