Hello, there two sources of voltage for the fuel pump relay. Voltage for the load side of relay comes from an inline 20 amp fuse, maybe located under the hood, passenger side front, probably attached to the fender lining, you'll just have to look. The other source, for the coil side of relay comes from the pcm. This info also shows an oil pressure switch in the fuel pump circuit, once you crank it enough to bring up oil pressure, the switch closes and the pump gets voltage even without the relay. The o/p switch and load side of relay gets voltage from the same fuse already mentioned.
Tuesday, August 18th, 2009 AT 1:43 PM