Which one is better? (long)

rbkt65 said
Let me throw another thing out here for discussion. My 71 dart has a nipple above the sending unit. I stripped out a 70 318 car that also has a bad gas tank. That fuel tank DOES NOT have a nipple above the sending unit. It has a nipple on the filler neck, very close to where the neck is screwed to the quarter panel. Also the filler neck on the 71, without the nipple is approx 3-4 inches longer than the 70 filler neck. Look up in factory parts book only says w/wo ecs. What am i missing here? I have a 71 fsm but not a 70.

ECS is emission control systems. To the best of my knowledge Federal spec cars generally came without ECS, California spec. came with. The extra tank nipple was for vapor return, and was used in conjunction with a charcoal cannister- with a charcoal cannister the tank is not directly vented, the venting occurs through the ECS system. Thus the two different style tanks and vented & non vented filler necks.