Mercedes Benz repair: 300SD hard re-start, vacuum line, vacuum system

Question
The automatic turn-off (fuel interrupter?) was not working consistently so the local "expert" disconnected the vacuum to the non-working climate control. Now the car cuts off instantly but if I try to restart after a short period say after running into the store for a  minute, the engine sounds as if it is not getting fuel. The previous owner bypassed the automatic cut-off in the ignition an the car uses a needle valve in the vacuum line attached below the ignition to cut the car off. If I pop the hood and turn off the car manually (as I was forced to do occasionally before the "repair"), the car starts right away. I assume the vacuum assisted fuel interruption is in the injection pump and there may be a problem there? Any suggestions?

Answer
Answer:
The issue is this altered vacuum system between vacuum pump and injection pump, the shutoff valve is functioning correctly, the vacuum system is not venting correctly.

Best advice:
Restore the vacuum system to factory function.

Join  Diesel Discussion
http://www.mercedesshop.com/shopforum/forumdisplay.php?f=15
They will be happy to walk you through the DIY.
Digital pictures posted in your thread will speed this repair.