I would like to add a follow up question. Can I remove the vent line that runs from the top of the expansion tank to the charcoal cannister and then use both large diameter hard lines as fuel delivery and return lines. If yes, should I just cap off the top vent line or "Y" it into another line? Do you see any problems with fuel delivery with the larger return line?
Early 260z, L26, SU's with both electric and mech. fuel pumps working.