K 1500 Truck 4WD V8-5.3L VIN T (2000)
Fuel Pressure Regulator: Description and Operation
Fuel Pressure Regulator Assembly
The fuel pressure regulator is a diaphragm operated relief valve with fuel pump pressure on one side and regulator spring pressure and intake manifold
vacuum on the other side. The fuel pressure regulator maintains a constant pressure differential across the injectors at all times. The pressure regulator
compensates for engine load by increasing fuel pressure as the engine vacuum drops. With the ignition ON and the engine OFF, system fuel pressure at
the pressure test connection should be 379-427 kPa (5562 psi). If the pressure is too low, reduced performance may result. If the pressure is too high,
excessive odor and a Diagnostic Trouble Code (DTC) P0132, P0152, P0172 or P0175 may result. Refer to Fuel System Diagnosis for information on
diagnosing fuel pressure conditions.
