What would cause the car to shut off while driving is a vapor lock or faulty pressure regulator, sometimes the car shuts off while driving and won't start.
What Would Cause Car to Shut Off While Driving?
(1) Vapor lock.
(2) Faulty fuel pressure regulator.
Car Troubleshooting
If the car stalling when driving happens when the engine temperature is abnormally hot then vapor lock is the usual cause of car stalling. Vapor lock occurs because when the engine is extremely hot, it will boil before it gets inside the engine. Once the gas is boiling the gas creates air bubbles. The created air bubbles can cause the air/fuel ratio to become lean. When the air/fuel ratio is lean, there is too much air and not enough gasoline, and when the engine doesn’t have enough fuel, the car will stall.
What to do?
There is nothing you can do when your car encounters a vapor lock. Just wait for the engine to cool down and start the engine again. The real problem here is why is the engine temperature becomes abnormally hot? Probably the engine has a problem with the cooling system, the normal process is when the engine is hot there is a coolant that is circulated around the engine coming from the radiator to cool down the engine, the water serves as a water jacket surrounding the engine but because vapor lock occurs it means that the cooling system is not functioning to cool down the engine.
Has it been checked by a mechanic, there might be a leak somewhere in the system, which causes the engine temperature to become abnormally hot.
If the car is equipped with a fuel injection system and if the car stalls even at normal engine temperature, then the problem is the fuel pressure regulator. The fuel injection system has a component called the "Fuel pressure regulator", the purpose of this part is to maintain the fuel pressure on each and every fuel injector, now if the regulator has a problem then the engine will be starved with fuel thus the car will stall.
What to do?
Bring the car to a reputable shop and have a mechanic check the Fuel Pressure Regulator. If the regulator is faulty just replace it to correct the problem. Replace only the pressure regulator and nothing else this usually fixes a car stalling while driving.
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