I have recently purchased the EVTM but still can't understand this problem with weird fuel pump problems. First thing is even after I replaced the fuel pump relay, that is the relay close to the inertia switch, ?, I dont get voltage from the black wire thru the relay to the red wire that goes direct to the Diode and to the fuel pump.
I can wire the voltage to the intank fuel pump and it will circulate the fuel but still will not crank. I did not find a replacement diode when I have just now replaced the fuel pump. I am suspecting maybe the EEC module. My next move is to buy a code reader when I can.
I have a new fuel pump pressure regulator not installed. I can see one small bolt that holds the bracket. Do you know about the other bracket bolts? Any info on this is greatly needed because I have actually been driving my 94 GMC 4X4 Yukon with Reverse, second, & first for months.