Why is my SUV not starting after it warms up or is hot outside?

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My 1992 GMC JIMMY Vin letter Z will start fine and run beautifully fist thing in the morning but after driving it a little bit and outside temperature raises the vehicle starts to chug and then shuts off like it's out of gas. I noticed that during it doing this there is no fuel coming from injectors and if I let it sit a few hours it then will spray fuel out the injectors and start for a small period of time. I replaced the fuel filter, the fuel pump and fuel pump relay with no luck. I dont know what else it could be please help.