Is he getting the same vac value at the shut off valve as what he is applying to make it shut off manually? After I modded my pump I found that it took another gasket thickness on the shutoff valve to get it to shut down quickly.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42