no stock ecu wire triggers the feul relay ( low power ) the relay sends bigger power amps always use a relay use the same wire from ecu to power up any other relay you want !!! ( still works like stock ) fit a thicker gauge wire from your new relay and run that to the back pump or as richard mentioned firts by using the original wire on pump as a trigger for your new relay circuit setup http://www.enginebasics.com/Advanced%20Engine%20Tuning/fuel%20pump%20relay.html """"" the red feulpump power wire """" in that diagraw will be your signal wire from ecu you get the idea now you can tap this setup of after any other 1 if you get me