I'd like to give the fuel pump a test for delivery- car does feel like it is starving for fuel. There is NO smoke at all from it, while my '91 smokes when running hard and shifting. Also, I keep driving it and the fuel needle isn't going down as it does in the '91. I suspect fuel delivery problems now.

Anyone know how to test the output from the fuel pump (ounces / minute or some such measure?)

Diagnosis is fun- kind of like detective work.

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1994 E420 43k (pickup, solid)
1990 300D 2.5 127k (sold) (now driven by friend)
1991 300D 2.5 73k (sold) (incredible car)

The procedure for checking fuel delivery is to disconnect the fuel return line and use a spare fuel hose to redirect the fuel into a container. Operate the starter to spin the engine at 150 RPM for 30 seconds. The shop manual goes through an elaborate procedure for hooking up a remote starter switch but I don't see any reason you could not just hold the manual fuel delivery shut-off on the IP in the closed position and spin the starter using the key.

The minimum amount of fuel delivered into your container should be 150 cubic centimeters - which if I've done my metric conversions correctly would be about 50 oz of diesel fuel.