W123 Vacuum Progress….

[G7Wagen]

@John757 I still haven't fixed my central locking. I have a W123 probably 1980 / 1 2.0 petrol. Is there a flow chart to find vacuum problems? I do have a good vacuum at the inlet manifold, and very commonly some of the doors lock all by themselves with no door lock key actuation.
If I could find a flow chart I could follow it through the system. The auto box works perfectly and so far as I can tell the vacuum tank seal under the rear parcel shelf is intact. I have stripped the shuttle valve and can't see anything wrong with it.

This might help

 

[gassygassy]

View attachment 147363

This might help

 

[gassygassy]

Thanks John, I printed that off earlier this evening. I think a red line is missing from the fuel door lock to the red pipe because the video shows two pipes on the fuel door lock.