Frank,
You mention a 5 psi pump you used to find leaks in the fuel system in another thread, would that be about the right size? The fuel pump delivery rate should be 150cm3 minimum on the 95 NA version going by the online FSM, not sure if its different for turbos.

I agree the build up of crud in the supply line could cause the 'pinch like' restriction by my logic. Then again, I'm a total newb at these things.

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Treetops
06 E320 CDI 127K Miles
87 300TD 231K Miles

99 E300 269K Miles-Sold