72 Demon fuel fill vent tube ideas?

72 should have had a charcoal canister.
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According to the shop manual. 72 and 73 manual, does not use the vapor separator This was built into the tank, with a single vent line and no separate separator. If THAT was the case you could run that single line "up high into the truck, then back down above the tank IE high in the wheel well, etc.

But if his car still uses the vapor can separate, you would have to retain the vapor can for the tank

Top photo is 71, requiring vapor can. Bottom photo is 72-73 showing one vent line, separator built into tank

71tank.jpg

72tank.jpg