1996 GMC Gets Hot Engine shuts down

Truck will start when it's cold outside, no problem.... As soon as the day heets up past 80 degrees the fule slows down and all there is is crank and no start. The fule pump ...if thats the problem works most of the time. The bleeder valve lets small amounts of fule at first . Then as soon as a good spray is released the truck will start. This has oniy happend once. I've replaced cap/roter, plug wires.

Check/replace the fuel filter pressure test the pump.