Vacuum Reservoir Plumbing Help Needed

Have you read the AC section in the service manual?

Download one here towards the end of the thread

http://www.forabodiesonly.com/mopar/showthread.php?p=1970088617

Index page 24-14

Page 24-42 is start of evap section for Dart, and goes through the controls graphically. You need to read through it. These diagrams are page 24-44, show the various vacuum actions