This may be too broad a question, but are there any "common"
points of vacuum leaks in a 300TD? I need a starting point.
I replaced the check valve on the pump and all the rubber bits
in the engine compartment. I wanted to avoid taking all the door
panels off. I checked the connection to the fuel door and pretty
much everything I could without disassembly.

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson