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Batteries can fail VERY quickly. Start fine one time and nothing 5 minutes later. Typical cause is an internal short or open. BTDT more than once.
 
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When the key is turned to RUN you should be able to hear the fuel pump run for about 2 seconds. Very easy to hear the pump if you put your head under the car near the gas tank and have a helper turn the key to RUN.

No noise likely bad fuel pump, but before replacing it, I would hotwire it to the battery and see if it runs then. If it runs, suspect bad pump relay or other electrical issue.
 

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If you used to hear the fuel pump run with key in RUN, but dont hear it now, pump is likely bad, but as I suggested earlier, hotwire the pump to the battery to see if it runs.

Can also have a helper crank the engine while you use a large rubber mallet to wack the bottom of the gas tank a few times. If pump runs / car starts, pump is nearly dead.
 
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