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Have you checked the fuel filter? Could be that it (or another restriction in the lines) causes it to run out of fuel in about the same amount of time as it takes to get to 120f. 120 is pretty low; and I think letting the car sit 20 minutes wouldn't cool it enough to matter. Anyhow, if you can start it and let it idle until it quits, watch the fuel pressure gauge the whole time. If it is steady until the car quits, look at other things. If it drops suddenly just before the engine quits, think something is electrically shutting off the fuel pump. In this case I'd follow the 'hotwire it' advice given and see if it goes away, then search for why it is shutting off (getting past the urge to leave it hotwired for good!). If there is a steady, downward movement of the pressure, look for a restriction in the line (filter or otherwise). Good luck.
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