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Sounds like your ignition module it is common on fords to do this when its cool it will start and run fine but once it heats up the truck dies until you let it cool down again and then your up and running till it heats up again. Some modules are mounted on the fender others are mounted with the distributor have it checked and let me know how it went.
To clarify, you said it runs for 20 min then quits, and it won't start again until it cools off. Have you checked for spark at the plugs and fuel pressure right after it quits running ? These models have an ignition module attached to the side of the distributor that has a history of failing when hot. The coil and the pickup inside the distributor can fail too. Could also be a relay.
Check behind the distributor cap and see if the cam cover seal is leaking. When that seal leaks the car will drive fine til engine heats up the oil and it starts fouling out the distributor cap and rotor. When it cools down the oil hardens again and car run fine. I would start by looking there.
Fuel Pump-a possible. The time frame of 30 minutes will vary.
The armature on the pump motor is worn, as well as the tiny bearing,so it seizes or just stops conducting current.
Drop fuel tank and replace. May be able to remove all bed bolts but rear ones, and tip bed up.
your ignition coil are going bad, they need to be replaced. once the car gets hot the circuit shut down the car when hot. once they cool your riding again until they get hot. thats your problem. Good Luck
I have heard that in some vehicles, when the coil warms up, it operates sporadically. When the engine dies and it cools back down it operates fine until it heats up again and fails. This could be your problem.