Catera V6-3.0L VIN R (1997)
Fuel Pressure Regulator: Description and Operation
Fuel Pressure Regulator
Fuel Pressure Regulator
The fuel pressure regulator is a diaphragm operated relief valve having the fuel pump pressure on one side and the regulator spring pressure and the
intake manifold vacuum on the other side. The function of the fuel pressure regulator is to maintain approximately 350 kPa across the director spray
plate under all of the operating conditions. The pressure regulator compensates for the engine load by increasing the fuel pressure as the engine intake
manifold vacuum drops. The pressure regulator is mounted on the fuel rail.
With the engine running at idle, the system fuel pressure at the pressure test connection should be 317-407 kPa (46-59 psi). If the pressure regulator
supplies a fuel pressure which is too low or too high, a driveability condition will result.