Explain the function of a fuel pressure regulator in a gasoline fuel system and identify the most accurate description of its operation.

Explain the function of a fuel pressure regulator in a gasoline fuel system and identify the most accurate description of its operation.

• A. Keeps the fuel rail pressure constant by adjusting fuel flow to the return line.
• B. Regulates the air-fuel mixture with the oxygen sensor.
• C. Regulates ignition timing.
• D. Controls fuel rail temperature.

Answer: (D)