if the lines around the fuel pump between the frame and carb are getting excessively hot, whether the line is laying over the heat riser passages on the intake, or the fan is creating a trajectory of hot air on parts of the line, the fuel in the line can vaporize. with the low boiling points of todays gasoline, we are witnessing vapor lock and heat soak symptoms that these cars didn't necessarily have from the factory with the stock configurations. these symptoms don't occur with fuel injection because those systems are under high pressure. There's essentially two different forms of vapor lock that we see on old carburated cars. Alternator Conversion for pre-1961 Buick.
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