Thanks Barry for your comments.

Not using the electric fuel pump any more.

Did change both filters in the process of working on these problems.

The gauge is a water pressure gauge. It is also not hooked up.
I used a hard plastic line from the spin-on filter to the IP.

The tank strainer was cleaned also when I changed the filters about a month ago.

Fuel line can't be obstructed because the primary filter fills up with fuel when the hand pump is used.

I tend to think that its the lift pump, so tomorrow I'll use the one on the turbo IP that I took off and swap them. Then I'll see if there is a difference in the fuel from the return line. There must be air also getting into the system from somewhere since it quit after about six miles.

On the IP that I removed I intend to take apart the lift pump and see if there is a problem I can recognize. Also, I am in the process taking apart the turbo IP. I finally got the ALDA off. Took the back plate off the IP I see how the shut off works. I'll be getting deeper into this thing. I don't know the correct terms for all the parts but I can see and feel resistance
when opening the throttle all the way. Maybe, I'll take some pics and post them.

Thanks again!

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83 300SD
80 300D