93 GMC Vandura fuel pump problems

I have a 93 GMC Vandura 5.7L. After replacing a bad MAP sensor, I had fault codes indicating EGR and or the EGR control selonoid, Baro sensor ( my van doesn't have one) and a lean exhaust reading from the O2 sensor. I replaced those components, and the engine was still not abel to run above an idle, (she would buck and stall). Now, after it stalled in my garage, I find there is no fuel coming from the injectors. I found the fuel pump was not running when I turned on the ignition. So I checked the fuel pump fuse and it was OK. I then pulled the fuel pump relay and checked it's operation. Everything seemed OK there too. Now I'm trying to check the fuel pump wiring. There are 3 wires leading to the fuel tank, purple, grey, and black. I assume black is ground, but I don't know which is for the fuel pump, and the sending unit. Anybody know which is for which? Also, I tried the old broomhandle trick banging on the tank when the ignition switch is turned on to see if I can get the fuel pump to start working, but no dice. Any help would greatly be appreciated. Andy54

I see many no starts on these vans cause by the fuel pump, a quick test I would do but be careful, open the fuel line at the throttle body and give it a quick crank, if you have fuel, obviously fuel pump is not your problem.

Good Luck.

Mr.Rob

My 97 Chev 3500 Van 5.7L was frougth with lots of irregular and seemingly unrelated problems. 99% cleared up when I replaced my fuel pump (which had 58 psi instead of the normal 60-62 psi)

Go figure.

Also, buy a repair manual (Chiltons, whatever). Worth the investment.

Odd chance there is a regulator problem, or other fuel impediment, but I'd have the F/P psi checked, or just replace it. My error codes were on, then off, then on again after cleared for a day. I probably replaced o2 sensors for nothing, except I plan to run it for 100 to 200 thou miles.

Good luck,

Gene