I put a fuel cell in my backhalfed 77 vette.I have 2 problems.....I can't fit a fuel return line to the top of the tank,the only place it will fit is on the sump.And the vent line also won't fit,the tank has a roll over valve,but I can't get the vent line on it.There is no room as the cell fits right up under the body so it will line up with the fuel door.I rwally don't think a vent line is needed.The fuel cell isn't in a trunk,it is open under the rear of the car.