Practice question

In a vacuum-referenced, return-type Multi-Point Fuel Injection (MPFI) system, what is the primary function of the fuel pressure regulator?

  1. To vary fuel flow based on engine coolant temperature.
  2. To maintain a constant pressure difference between the fuel rail and the intake manifold.
  3. To shut off fuel flow completely when coasting downhill.
  4. To mix air and fuel before they enter the injector nozzles.

Answer: B — To maintain a constant pressure difference between the fuel rail and the intake manifold.

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