I have a V8 German spec ‘84 110 CSW. I’m sticking with the inline fuel pump & filter mounted on the outrigger in its original location. There is a small line of some kind coming from the front of the truck. It was mounted to the “L” bracket on the frame with plastic clips. When I removed the pump that was there, it was not connected to anything. I attached photos of the bracket, line & parts book pages. When looking in the parts book, the “Fuel Pipes” are all there (1-4, p378). The fifth line is not listed or shown. There is a note on the same page that mentions “Vent Pipes”… could it be that? Does it connect at all? It is angled towards the fuel filter. Looking at page 338, is it the "Vent Pipe" (items 11 & 12)? I did not trace where the line connects to the engine.