Marvin:

The "octpus" thing is a seal -- all the vacuum lines and such from the dash and etc run through it. To replace it you will need to disconnect everything!

All the vacuum lines should attach to something except the vent line (black) that goes under the dash or somewhere like that -- lets air in to vent vacuum when required.

Vaccuum line to oil filter housing? That's new to me -- what color is it, and is it actually attached? There is an oil pressure line (thinner than the vacuum lines) that goes to the gauge, but I think that goes to the main oil gallery, not the filter!

The modulator control valve may be on the IP rather than valve cover.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!