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What might be suggested to cure the chronic vapor lock on a 1964 cruiser with air conditioning?

Plum the car like a Jet-Thrust powered car. Drop the fuel tank and have a 1/8-27NPT bung soldered to the upper left corner.  Screw a 1/4" hose fitting into the bung. This would be a good time to change the filler neck and fuel line hoses to new ones that are compatible with today's oxygenated fuel. Check the tank for leaks or weak areas and have it treated / repaired as necessary. Then reinstall the tank.Run a 1/4" steel line on the left side of the frame, mirroring the fuel line along the right side. Bring the line up next to the fuel line going to the carburetor from the pump. Install a fuel filter that has a return fitting coming out the side, the type used on many Chrysler and Jeep products in the late 70's and early 80's.  (See note that follows) Use a short piece of 1/4" fuel rated hose to connect that "vapor-side" fitting to your newly installed return line. Take a piece of 3/8" rubber fuel hose and slit it length wise with knife. Slip that slit hose over the steel line from the pump to the carburetor and secure it with some small wire ties. That should cure your vapor lock problem.

NOTE: There are 4 applicable NAPA in line fuel filters with 5/16" fuel line tubes in and out with a 1/4" vapor return port: NAPA numbers are 3040, 3054, 3082, and 3086. The difference among these filters is the position of the vapor return port, so pick one that will fit your vapor return line connection as you have configured it on the car.  For high performance cars, NAPA filter #3041 has a 3/8" tube in and out.  It is strongly recommended to use an all steel line from the fuel pump all the way to the carburetor. Current technology fuel hose should be used only to connect the steel line to the fuel filter.