Thanks to the gentlemen that responded to my problem I got up this morning, first made sure the check valve was not stuck, all good there and very dry. I used the brown shut down vacuum line off of main black hose next to brake booster. Hooked up the Mity-mite to it, removed the 4way vacuum hookup while running plugged that line both ways had zero vacuum. hooked back up while running and turned ignition off, hooked mity-mite up to brown line and pulled vacuum and shut engine down.

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Joseph Blackwell
1985 300SD
1990 300 2.5 Turbo