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The fuel pump supplies fuel under pressure as long as the crankshaft is turning. For safety, the pump is switched off by the ECU (via a relay) after about five-seconds if the crankshaft stops turning. During the start sequence, the pump is run long enough to pressurize the fuel lines then stopped by the computer awaiting the signal that the engine is running/turning. Then the computer turns the pump on again.

So, if the crank rotation sensor gap is incorrect such that it grows too large at temperature to send a signal, the ECU will think the engine is stopped and shut off the pump. A cracked engine casing will also cause the gap to be incorrect at temperature.

If the sensor-ECU wiring or the sensor itself is faulty this can also result in pump shut-off.
 
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