The gauge is non fluid dampened, so I'll try to find one that is. and measure it again.

Your are right the lift pump is from the 80 NA engine so I will be removing it and going back with the original lift pump that I know was working, because of previous tests before I switched the IP's. It did have some pressure and the return line was dumping fuel at a good rate.

I know things are getting some what confusing since I've done so many things. As you said before in a "shotgun approach" But, I am getting a better handle on whats going on here. Now I have a better feel for what to test and how to test it.

I read a thread about a stuck rack in an IP and soaking it with gas to remove the junk in it. That could be my problem with the original (turbo) IP. I can see the rack with the alda moved over and it does not seem to be moving back and forth smoothly. I'm going to try and clean that IP and purge it with gas for a few weeks as was suggested in the thread. It seems to me that rack could be stuck in the open position when it gets hot thats why the linkage is at idle but the engine remains running at a high rpm. As it did in the video I posted.

Also I think I'm going to replace all the soft fuel lines and clamps just to eliminate the possible sucking of air. I'll switch the return line with the fuel line also as you suggest to clear out the line.

in a previous post you said:
"Your engine will run with the non turbo pump if required . Just no fuel enrichment on demand." What does no fuel enrichment on demand mean exactly?

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83 300SD
80 300D