Technician a Says the Fuel Pressure Regulator in a PFI

Technician A says the fuel pressure regulator in a PFI system senses manifold vacuum and  continually adjusts the fuel pressure to maintain a constant pressure drop across the injector. Technician B says the pressure regulator in a PFI system is designed to provide a constant pressure to the fuel injector throughout the range of engine loads and speeds. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Correct Answer:

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