Fuel Pressure Regulator 2
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The engine control module (ECM) controls the fuel rail pressure using 3 pulse width modulated fuel rail pressure regulators. Fuel pressure regulator 2 is located on the rear of the fuel rail and meters the amount of fuel being returned to the fuel tank. The ECM varies the pulse width modulated voltage to fuel pressure regulator 2 to relieve excessive fuel pressure allowing fuel to return to the fuel tank. When the ignition is Off, fuel pressure regulator 2 opens to bleed off the pressure on the high pressure side of the fuel system.