Does anyone have any photos of the vacuum connections on the driver-side firewall and the multi-line rubber connector on top of the valve cover of a functioning '83 300TDT? Based on what I've been able to find online, I know I'm missing a yellow check valve at the firewall but I'm clueless as to which lines plug into it/out of it. Any ideas what each line (black, amber, solid yellow, yellow w/gray stripe and green w/yellow stripe) is and where they go? I also have a mystery line that's got a screw plugging the end of it. Any ideas on this one? I'm guessing it should plug into the multi-line rubber connector on top of the valve cover but have no idea which hole in the connector.

Photos of lines to be posted ASAP...

Have you looked at the vacuum diagram in the engine bay?

I long ago searched and found nothing of the sort.

Here.