This w220 has an issue with the rear shock bleeding down. They sag quickly, within min. Overnight they are bottomed out. I suspect the rear struts to be the issue but not sure how to confirm this. I can’t hear the air leaking out. I wanted to confirm that the valve block is not the issue. I disconnected the line from the pump and submerged it. I am getting a bubbling but not sure if this is a large enough leak to condemn the valve block. According to the DAS laptop the valve block passed the leak test to both the reservoir and the pump.

https://youtu.be/7nKAdXGVaUk

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Andrew Villasenor
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1984 300D turbo 5-speed manual(daily driver)
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There isn't a good test for the block. If the shocks aren't recent replace them first. Then replace the block if they keep going down.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff