Both fuel pump fuses are good and the fuel pump relay in engine compartment relay box is good. If I remove the relay and jumper constant battery voltage to the fuel pump, truck starts and runs as normal. My conclusion - relay is getting "crank" voltage" but not "run" voltage until RPM is high enough to trigger the switch-over. I'm guessing it's related to either oil pressure, crank position sensor or alternator output voltage? What should I look for next? Maybe just stop looking and shoot it?
have the same problem?
Wednesday, October 3rd, 2007 AT 3:48 PM