Fuel Pressure Regulator Test

3. FUEL PRESSURE REGULATOR TEST:

A. Use an accurate fuel pressure gauge for this test.
B. Release fuel pressure before installing fuel pressure gauge (use CONSULT Work Support to disable fuel pump or remove fuel pump fuse, start engine and allow it to run out of gas).
C. 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:

D. Check the fuel pressure at idle and with the regulator vacuum hose disconnected. 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.
E. Stop engine, disconnect the fuel pressure regulator vacuum hose from the fuel pressure regulator and plug it.
F. Connect a vacuum pump to the pressure regulator port.
G. Start the engine, the fuel pressure should decrease as vacuum increases, if not replace the fuel pressure regulator.
H. When reconnecting the fuel line use new Genuine Nissan hose clamps.
I. Leave the fuel pressure gauge attached for the next step.