Chrysler did have a vapor lock kit for cars with the mechanical fuel pump. In those cases the cars were fine cold but stalled when the fuel got hot, vaporized and could not be pumped by the mechanical pump. It involved adding a low pressure electronic pump near the tank. However, when I had cars that didn't pump gas as expected with a mechanical pump it was either the faulty pump or a pinhole in the lines between the pump and the tank that caused the problem.
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I don't know for certain as I don't have a copy of the TSB but I was told it is a 1.7 hour repair time because I'd assume the modification must include some sort of shut-down provision so the pump doesn't keep pumping fuel when the car isn't running. This was an external in-line low pressure fuel pump mounted near the tank.
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