The black line comes off that connector in the pic and just goes nowhere. I have no idea where it is supposed to connect. I traced all the vacuum lines for the ignition and IP and everything looks great. I am not sure where this is supposed to plug in. What is a vent line?

__________________
-----
1981 240D/297K/4-spd/OM617 (mine)
1982 240D/241K/4-spd (wife's)
1979 240D/291K/4-spd/OM617 (father-in-law's)
1983 300DT/240K/4-spd (brother-in-law's)
1985 300DT/???K/5-spd Intercooler conversion (brother-in-law's)
1985 280TE/160K/5-spd (father-in-law's)
1963 UNIMOG (brother-in-law's)