Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Vapor lock happens when fuel boils which is right at 100 degrees. The carb is to old to have a hot idle compensator, so you need to vent it good somewhere like at the bowl. Vapor lock never happens on newer cars with high pressure pumps because the fuel is moving to fast and doesn't have an opportunity to sit an boil. Another goofy way that I saw to prevent vapor lock, and it did work but looks stupid, was to put clothes line wood clips on the fuel line so the heat would get dissipated to the wood. It worked too.