I have a 1984 300CD and the vacuum hose connections for the car body systems were all in a rats nest of fittings in bad shape. I would like some help putting it all back in place please. At the firewall there are 5 lines for the systems as I see it. They are:

1. Door lock system
2. Seat Back lock system (coupe only)
3. HVAC system
4. Fuel shutoff system

The 5th line is the Vacuum Reservoir tank line.

My main question: Do all 4 systems connect to both the vacuum pump line and to the reservoir line through the use of the 2/3 way yellow check valves, one valve per system?

2nd question: The vacuum pump suction line that runs to the brake booster has 2 tee connections. Is it correct that the intake manifold pressure system connects to the tee connection closer to the vacuum pump and the car systems above connect to the tee connection closest to the brake booster that is actually on the check valve in the main line?

If I can get this straight I believe I will be in much better shape. I had so many leaks that the engine would not shut off via the key switch. The worst leak was the drivers side door lock/unlock valve.

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1984 300CD (sold)
1973 220DPK 4 spd (died)
1978 350SL 4 spd gray market
2003 SLK32 AMG
1988 300CE (sold)
1997 E420 (Totaled)
1998 E320 Wagon