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You should be able to simulate the problem by running it and getting it very hot then turning it off and letting it hot soak.
I don't know anything about a fuel valve on these, but I'm not that familiar with them. Having a solenoid valve not work sometimes is common, but for it to not work in heat only, and not just randomly is a bit odd.
At any rate, next time you experience the problem, try cycling the ignition on and off, waiting at least 5 sec between them. That should prime the fuel pump several times. Maybe you're simply losing prime, or getting vapor lock, and that should take care of that.
Also, depending on the car's design, if it has an intake air temperature sensor (unsure) that may get super hot on a hot day, and the computer will think it should use as little gas as possible. That's a thing that can happen.
If it's like the old Chevy TBFI, you can watch the injectors spraying fuel as the engine runs (or cranks).
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