relocating gas tank on d-50

i believe there are like four fuel lines that came off my tank. are all four needing to be hooked back up? i know one or two of the are just vent lines, does anyone know exactly which ones need to be re connected and which ones don't?

if youve got the injected model, im not really sure. but if its a carbed model, follow the lines up to the engine compartment and i think youve only got 3 lines up there. one of them goes to the charcoal canister which isnt important at all. the other two lines will be the feed line and the return line. these two lines are the only ones you truly need. basically it works like this, feed, return, and a vent to allow it to pull air.