Grand Prix V6-204 3.4L DOHC (1992)
Fuel Pressure Regulator: Description and Operation
Fuel Pressure Regulator Assembly
The pressure regulator is a diaphragm-operated relief valve with fuel pump pressure on one side, and regulator spring pressure and manifold vacuum on
the other. Its function is to maintain a constant pressure differential across the injector at all times. The pressure regulator compensates for engine load
by increasing fuel pressure as engine vacuum drops.
With the ignition ON and the engine OFF (zero vacuum), fuel pressure at the fuel pressure test connection should be 284-325 kPa (41-47 psi). If the
pressure is too low, poor performance could result. If the pressure is too high, excessive odor and a Code 45 may result.
