If going to be using a standard automotive bosch relay and assuming you have fixed the original setup which then its pretty easy to wire up. Basically use the original feed wire to trigger the new relay - there wont be any load on the original wiring/circuit open relay that way. On the normally open relay the terminals are labled: 30 - Load feed ie fused supply from the battery, large capacity wire 85 - 12v Trigger, use the existing 12v fuel pump feed 86 - Ground 87 - 12v Output to fuel pump Or if you wanted to forgo the factory circuit open relay you can wire it: 30 - Load feed ie fused supply from the battery, large capacity wire 85 - 12v feed from ignition key when "ON" 86 - Trigger, use the FC pin from the ecu which is a ground trigger 87 - 12v Output to fuel pump Looks like those pumps can pull up to 20amps so make sure your using appropriately sized cable for the lengths you need.