http://www.peachparts.com/shopforum/showthread.php?t=105297

This might help. Do a thread search. I know someone posted a hand drawn color coded diagram of the 123 vacuum system because I have a copy of it. Unfortunately it doesn't have the link printed on it.

John

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Certified Registered Nurse Anesthetist (CRNA)
2002 F250 powerstroke with Plantdrive WVO conversion
1983 300SD 190K miles ,sold
2006 E320 CDI