The gas tank in my 71 Duster is completely shot, and it had one of those vent tubes next to the filler neck in the trunk. The vent has 5 connections coming from the bottom. I have mint cond. used tank that I pulled from a 74 Dart Sport. But this tank does not have the 5 vent lines, it only has one. So what do I do I looked in Year One and on Ebay , and all the new replacement tanks are single vent style tanks. So How do I make a single vent tank work in my car? What was so different in the 74 cars, that they only needed 1 vent? And BTW, the filler neck from the 74 is longer than the one on the 71, is this gonna be a problem too?