Fuel Return Line - Do I Need One?

aracer01 said
This car now has the tank vapor line, fitted to an open tube that lays under the intake for evaporation. The regulator has an extra out, that I want to use an orifice 'd down fitting, connected to that vapor line and use it, after I disconnect from the separator tank. I will add some 1/4" steel tubing to reach to the sender's return fitting. NOW WHAT? is the best way to vent the gas tank from the tank's separator's vapor out fitting?? (answer?) A new 1/4" steel tube going up near the fill opening and back down to inside the frame, like my 68 cuda? (Thanks for reading this mess.)

Pretty much. You MUST get the vent into an "open" or "vapor" area to prevent a siphon. I'm not familiar enough with the later cars to exactly advise. I would guess if you built a vent from the original fitting in the vapor separator, you are OK. Some cars had what amounts to a check valve right near the end of the 1/4" tube in the engine bay. Look for a suspicious crimped area within 6" of the end. You want that removed