Another Fuel tank thread - 71 Demon

First, if the car has the 4 vent tank and smog riser it is an emissions car. They started earlier in California but the single vent is the non-smog set up and the 4 vent with the riser is the smog set up.

Second, and don’t take this the wrong way, but the hole in the floor pan, the quarter panel mounting location for the filler tube, and the filler tube rubber are all the same. The filler tubes are basically the same too, the cap style and whether the tube mounts inside or outside of the quarter changed (and not until ‘72) but beyond that they’re all interchangeable.

I converted my ‘71 Dart, which had the smog riser and 1 year only cap over to a ‘74 tank and filler tube. In fact many people have converted their emission equipped’71’s to other model year tanks and fillers because the caps for the emissions tank ‘71’s can be difficult to find and very expensive. The mounting hole pattern from the quarter to the filler tube flange is different but beyond that they swap right over, even changing the tube flange from inside to outside.

I’m not saying the filler hole isn’t a 1/4” different. I’m just saying none of the other parts are. Which means you can get them all to line up. If the rubber seal on the filler is bound up, loosen the tank straps some and the tank will shift about. It’s not an exact deal.

(edit- changed '73 to '72)