Sorry, reread you post.

There should be a brown vacuum line that runs to the shut off valve on the IP. I believe the vavle is round. No Vacuum, no shut off.

The line starts on the left fender and goes over to the IP.

Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.