Newbie here with questions...
My "Ole Trusty" 99 Sierra 1500 with the 5.3 quit running the other day
after testing everything it appears that the ECM isn't sending power to the Fuel pump relay.
So my question is , does anyone know what tells the ECM to power the fuel pump or does it mean the ECM is bad ?
I can jump FPR and get her back to running and i have tested continuity from ECM to FPR
thanks in advance