When I disconnect the line going to the vacuum modulator and take a pump reading it goes immediately to 22-23".

When I disconnect the line going to headrests and climate control (i.e. with line to vac mod sill in system) I get a poor reading (around 8").

So it seems pretty clear to me that the pump is NOT the cause of the symptoms...that the problem is in that circuit I suspect.

Question: should the clear line with the blue stripe that runs from the VCV hold vacuum with engine off? It doesn't....so maybe I have a bad VCV?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 161k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 147k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 81k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife