Separate issues... Shut down is not related to startup...

For shut down, you FIRST need to verify vacuum is present at the pump... Then follow it until you no longer have vacuum...
Stating per vacuum devices work fine, has little to do with your problem too, as the SD has a separate vacuum system for several things in the car.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!