Twice you've referred to it as being on the side. Are you sure we are talking about the shut off valve? It's not the VCV which is also on the back of the IP and has a bunch of vacuum lines attached. The shut off valve is way down on the back of the IP between the IP and oil filter housing. It's hard to see it by looking at a distance. You have to get down close.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13