snakebob

i just got a 1974 porsche 911s and found out that it had a fire under it. where the lines come out from the body and frame there are three hoses and im not quite sure exactly whaere they go or what the third line is for. please help me with some schematics if at all possible or explain what in the heck i'm looking at!!! will try to add a picture soon its the main tube down the center where all the cables come back towards the engine