Thanks guys on all the valuable info on this forum site. I usually don't post just read and troubleshoot on my on. I just replaced my harmonic balancer pulley last night. The project was easy and quick. (30 min) I have also installed a heat sink PMD kit on my truck back in Oct of 05. (bolted on top of the intake) About 3 weeks ago my truck started to quit again intermittently on the road. So I guess another PMD is in order.
So, to the question at hand. What is the GM part # or Napa # for the Lift Pump Relay. I am trying to get the part through my local family owned parts house. The vehicle is as follows:

1994 Chev K2500 4x4 6.5L Turbo "S" engine

Again thanks for all the help.
Dallas:ro)

Here is the part #'s: Advanced Auto--MR44
G-P Sorensen -- RY109 ($7.00)Local parts house
Only problem I replaced the relay and the pump still doesn't run when key is in run waiting on the glow plugs. I also replaced the OPS back in the Spring and the pump runs when engine is running. ( I think, haven't felt of the pump when running since I installed the OPS) Well I'm still learning the troubleshooting guide to the 6.5 but loving every minute of it. Keep up the great forum.

There are 2 major faults with the 6.5l engine ( excepting
engine mech failure ).

They are, PMD failure, & LP Failure....( OP's ) on 94-95)

1. PMD must be remote mounted ( not on intake)
2. Fuel pressure Gage for LP.

The gage is to determine if problem is Fuel related or PMD failue.

Without a fuel pressure gage, You guess and Pay...