F - Is the temp sender for the guage, The one on the thermostat housing is the fan switch.
D - Yes, It returns fuel vapours back to the tank.
C - can't remember which one but it goes to the starter, the alternator or the dizzy (I don't do alot on the single cam 82's)
E - Pretty sure that is the purge valve for the charcoal can.
A & B is for the a/c idle up.