88 560sl fuel regulator??
 

please excuse my stupid question, as I am just getting into the mechanics of my sl, but why does a line come from the low pressure side of the A/C to the fuel regulator(if thats what I am seeing)? I think its the fuel regulator, it sits on driver side next to the fuel distributer with one big line and one small line to the distributor.

The AC line does double duty as a fuel cooler.