Breather tube as a return line
you need to look this up in the factory shop manual. This has changed over the years, I don't know what might be different between 73-4-and 75
That IS your tank vent. You need to leave it open, or rework things.
If I had one of these cars I would weld a fitting into the filler neck just exactly like the 69 /earlier cars did.........This is an open vent, it originally is exactly as pictured........the lower end of the vent tube is open, and ends inside the rear frame rail. The reason it goes "up high" (Up against the inside top of the rear quarter) is to prevent siphoning. Only time that setup will siphon is if the tank is really full, and you are parked on a side-hill with the filler side downhill. Then, it will only siphon enough to get fuel below the vent line fitting in the neck
https://www.google.com/search?q=67d...1N6QI-&biw=1025&bih=460#imgrc=jcFlPdwVSUJ8qM:
you need to look this up in the factory shop manual. This has changed over the years, I don't know what might be different between 73-4-and 75
That IS your tank vent. You need to leave it open, or rework things.
If I had one of these cars I would weld a fitting into the filler neck just exactly like the 69 /earlier cars did.........This is an open vent, it originally is exactly as pictured........the lower end of the vent tube is open, and ends inside the rear frame rail. The reason it goes "up high" (Up against the inside top of the rear quarter) is to prevent siphoning. Only time that setup will siphon is if the tank is really full, and you are parked on a side-hill with the filler side downhill. Then, it will only siphon enough to get fuel below the vent line fitting in the neck
https://www.google.com/search?q=67d...1N6QI-&biw=1025&bih=460#imgrc=jcFlPdwVSUJ8qM:
