REMOVAL & INSTALLATION
See Figures 1, 2, 3, 4 and 5
The fuel pressure regulator is attached to the fuel supply manifold assembly downstream of the fuel injectors. It regulates the fuel pressure supplied to the injectors. The regulator is a diaphragm operated relief valve in which one side of the diaphragm senses fuel pressure and the other side is subjected to intake manifold pressure. The nominal fuel pressure is established by a spring preload applied to the diaphragm. Balancing one side of the diaphragm with manifold pressure maintains a constant fuel pressure drop across the injectors. Fuel, in excess of that used by the engine, is bypassed through the regulator and returns to the fuel tank.
- Remove the vacuum line at the pressure regulator.
- Remove the three Allen retaining screws from the regulator housing.
- Remove the pressure regulator, gasket and O-ring. Discard the gasket and inspect the O-ring for deterioration.
- Lubricate the O-ring with light oil prior to installation.
- Ensure the gasket surfaces of the fuel pressure regulator and fuel rail assembly are clean.
- Install the new O-ring and gasket on the regulator.
- Using new allen head screws, install the pressure regulator on the fuel rail assembly, tighten the screws 27-40 inch lbs. (3-4 Nm).
- Install the vacuum line to the regulator.
- With the injector wiring disconnected, turn the ignition system to RUN and allow the system to pressurize. Check for leaks. Connect the wiring, run the engine at idle for 2 minutes. Turn the engine off and check for leaks.