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Could be any of several things. If the crank sensor is marginal and not sending pulses, the fuel pump is shut off. This is for safety. The pump is energized for a few seconds as key is turned in preparation for starting then engine must rotate normally to keep the pump on. If it stops, in a few seconds the fuel is cut off.
with key in ON position can you hear the fuel pump humming uder the middle of car? the pump should hum for about 10 to 15 seconds,then go off and come back on when the key is turned off and then key turned back on.could possibly be a bad fuel filter, or a fuel pump going bad, it's definitly a fuel issue because it starts. try replacing the most inexpensive thing 1st. the fuel filter and then the fuel pump. hope this helps!!!