Fuel Pressure Regulator Test

Note:
The best way to resolve a Code 45 or driveability incident is to carefully go through ALL the steps contained within this bulletin.

1. Use an accurate fuel pressure gauge for this test.

2. Release fuel pressure before installing fuel pressure gauge (use CONSULT to disable fuel pump or remove fuel pump fuse, start engine and allow it to run out of gas).

3. Disconnect the fuel hose between the fuel filter and the fuel tube on the engine side and install the fuel pressure gauge.





Fuel pressure specifications:

4. Check the fuel pressure at idle and with the regulator vacuum hose pinched oft. Compare your reading to the specifications in table 1. If the fuel pressure is excessive replace the fuel pressure regulator and RETEST to verify that fuel pressure is within specification.

5. Stop engine, disconnect the fuel pressure regulator vacuum hose from the intake manifold and plug manifold with a rubber cap.

6. Connect a vacuum pump to the pressure regulator vacuum hose.

7. Start the engine, the fuel pressure should decrease as vacuum increases, if not replace the fuel pressure regulator.

8. When reconnecting the fuel line use new Genuine Nissan hose clamps.