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You do not mention what car you have. Did the mechanic draw the fault codes.
The crank sensor can cause this behavior. The sensor operate is a very hot aria on the engine block and the wiring spool inside the crank sensor become misformed as a result of all the heat. The signal that the sensor then sends become weak and the ECM engine control module cannot read the signal properly and the result is the engine switch of.
Please if you let me have more information we can talk more.
Then I would recommend the mechanic replace the crank shaft sensor as they sometimes do not trigger a fault code because the signal is just weak.
The crank shaft sensor is next to the oil filter on the flywheel side of the engine. No the sensor read the engine speed and has nothing to do with the fuel system.
Yes I can understand it because from what you describe they did the correct checks, cars nowadays are not easy to repair, there are so many possibilities that can cause the same behavior.
But I think this should be the answer.