Hose from Tank to Line 72

Professor Fate said
October of '71 build date makes your car a 1972 Model year.
Now, let's attack your issues.
1.) You're not getting any fuel because your line is kinked closed in at least 2 places:
View attachment 1716140215
2.) There is no vapor return port in the sending unit. You're thinking of aftermarket senders with a fuel return line.
The factory put the vapor return port (on cars equipped with EEC) on the upper tank:
View attachment 1716140221
Cars without EEC have the vent in the filler neck. It consists of a nipple in the filler, a short hose connecting it to the vent line which loops up into the C pillar, and looping back down along the filler and exiting the trunk through the filler tube seal and terminating in the driver's side frame rail.
3.) I think you have EEC, because this looks like the 1/4" vapor return line that would come from the front of your car (green circle):
View attachment 1716140225Connect it to the tank vapor return nipple shown in the previous picture.
The red circle shows where the fuel line should be tucked behind the tank hanger strap, which will put the line more in alignment with the fuel pickup (sender) elbow, requiring just a small section of 5/16 fuel hose to make the connection.
4.) You then need one of these to connect the fuel tank outlet to the fuel line (it serves as a ground strap from the sender to the metal fuel line- that's why there is only one wire to the sender; it grounds to the body/frame via this connector):
View attachment 1716140231

I was apparently unclear in my initial post. I was using my phone and that was my fault. The topic is the rubber hose that connects the steel fuel line to the fuel tank sending unit on a 1972 Duster 340. I purchased this vehicle recently and determined that it would not start due to fuel not reaching the carb despite a working fuel pump. Upon inspection of the rubber hose in question I found it was collapsed. By removing the correct 1972-style fuel cap I determined the fuel tank was under tremendous vacuum. I was aware that the vapor return line, which you circled in green, led to the charcoal canister under the hood, and that it was disconnected by a previous owner. I then felt the top of the tank, which you circled on the pic of the new one, and discovered there is NO vapor return line nipple on this tank. Not knowing if that was a mid-year change to a vapor return line port which was integrated into the sending unit (which I saw in pictures of aftermarket units) I included the date of manufacture for clarification purposes (which ended up just being more confusing). I apologize.

When I said "someone changed some stuff" I was referring to a previous owner who clearly did not know what they were doing. However, I do not know how everything was supposed to be connected in the first place, either. The drawings in the multiple manuals I have are not good. I was hoping someone had an image of a correct one. From what you have said, it appears the fuel tank was replaced with an incorrect one and will need to be replaced. Yes, the ground straps will need to be replaced as well. I have verified that the fuel filler neck and cap are correct for 1972. What I am trying to do now is just replace the fuel line rubber hose in question to see if the engine runs with the fuel cap removed, because as of now I do not know if this engine is any good at all.

I removed the rubber fuel hose, trimmed and straightened it a bit, but it still requires an almost 180 degree bend and then another bend on the sending unit side to fit, which does not seem correct. I thought that if the the fuel sending unit (which I now know is actually the tank) had been replaced with an incorrect one, that maybe the steel line had also been replaced with an incorrect one. A pic of a correct one would help immensely. However the following picture was the only one I found on this very forum and it shows the fuel line in front of the tank strap. I believe the poster said it was from a Duster which was newer than mine.