Can't tell you the colors on an 84, but the 115 chassis lines were brown and brown with blue stripe. You probably didn't disconnect the line to the IP, so the brown with blue stripe should go to the ignition switch.

I don't think there is a check valve in the cutoff system -- it only ports vacuum to the IP to shut it off. There isn't any vaccum in it when the engine is off.

You can check the operation of the check valve by sucking on it -- I think the arrow point to the direction of flow (so you have it correct).

You can check operation of the cutoff by sucking or using a vacuum pump with the key off -- pull a vacuum on the supply line (or what you think is the supply line) and check for vaccum at the line on the IP. Turn the key on and repeat -- should not have vacuum. Only the ignition cutoff is on this system, nothing else.

The two lines with vacuum check valves are for the AC and the locks.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!