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Q:

truck wont run for more than 15 min if it is warmer than 70 degrees on 1997 Chevrolet 1500 Pickup

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Had changed the fuel pump at one time but still have the problem. runs great in the cold never dies. But in the warm weather it wont run for long. let it cool down and it starts right up.
(1) Answer
sounds like vaper lock try covering the fuel filter with alumminum foil. This sometimes keeps the filter cool.