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Vapor lock?

Fuel System

Model: speedster, Year:1958, Mileage:10000, Type of use:Street use only
We have a 58 Speedster here in Denver, CO. On a hot day the car will run for 30 minutes or so and then simply die, ie like vapor lock occurs. We let her sit for 15 to 20 minutes and she is good for another 30 minutes?Could this be vapor lock caused by fuel line routing problem ? Or must I run race gas in this car ? thanks for the help.

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