The fuel distributor has an inlet from the fuel pump, a line to the cold start valve, a return line off the pressure regulating valve, and the control pressure line is on top, which goes to the TPS and WUR. The fuel distributor return line joins to the control pressure return lines after the WUR and Throttle position valve.
What model fuel distributor do you have? 0 438 100 004 is the original type. Yours seems to be a later type.
The line on the bottom of the air box may be the oil drip tube that drains off the front of the engine between the oil cooler and clutch.
The line to the distributor comes off the throttle body.
