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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1957 (Engine Controls And Fuel - 3.5L - Introduction) >> Description and Operation >> Fuel System Description >> Pressure Vent Valve

Pressure Vent Valve

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The pressure vent valve replaces the typical fuel pressure regulator used on a mechanical returnless fuel system. The pressure vent valve is closed during normal vehicle operation. The pressure vent valve is used to vent pressure during hot soaks and also functions as a fuel pressure regulator in the event of the fuel pump flow control module defaulting to 100 percent pulse width modulation (PWM) of the fuel pump. Due to variation in fuel system pressures, the opening pressure for the pressure vent valve is set higher than the pressure that is used on a mechanical returnless fuel system pressure regulator.

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