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Problem solved today. The problem was the wiring at the lift pump, once I put in a temp splice it started right up. Will have to redo the wiring later this year when it warms up.

Guys, Thanks for the info on the jumper point under the hood. I was expecting to do this from under neath the truck. I am hoping that I just pulled the OPS wire or something similar and fell that I have enough info to track it down. At this point it will probably have to wait until the...

Guys - thanks for the advice. It will have to wait until I have a weekend with decent weather. Will post what I find when I find it in a few days or weeks... You know how it goes. I will check the voltage on the LP and probably try to jumper it then see where things lead me. I really need...

JMJnET, I had also checked the fuses today - Lift Pump and ECM and everything else in the box. Had also seen the other thread on the GP RELAY overtorking, so I confirmed the voltage at the GPS, they are now working. Also tried plugging in the block today just to make sure it was not a hard...

Rodd, Thanks for the diagnostic steps, things just got a bit simpler. My lift pump does not appear to do anything, when the key is turned on or when the engine is cranked. I also opened the fuel waste gate and never have any fuel (with key on or cranking) which seems to confirm that the...

NVW, Thanks for the ground locations. I wll look at them. Also will consider looking for a PMD to try though not sure where I will get one short of buying one.

NVW, I used the resister from the old PMD, and it plugs directly into the factory plug.

Problem: Explain your problem in concise language (ie: Cranks but won’t fire). Cranks and Fires (very intermittantly) but does not start or come close to starting Demographics: tell us about your truck and your ambient conditions: - Year: 1997 - Truck model and class (ie: c2500) 3500...

Hello All, I was working on my GMC Today and replaced the Glow Plug Relay. The truck was warmed up before hand and ran well. Replaced it, and it started promptly. The truck was idleing for a short period then made a strange noise, and idled for a couple of seconds then stalled. It has not...