Hose from Tank to Line 72
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:
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:
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):
Connect 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):
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:
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:
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):
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):