Method A

1. Release fuel pressure to zero.  refer to "FUEL PRESSURE RELEASE ".
2. Prepare fuel hose for fuel pressure check, and connect fuel pressure gauge.
   • Use suitable fuel hose for fuel pressure check (genuine NISSAN fuel hose without quick connector).
   • To avoid unnecessary force or tension to hose, use moderately long fuel hose for fuel pressure check.
   • Do not use the fuel hose for checking fuel pressure with damage or cracks on it.
   • Use Pressure Gauge to check fuel pressure.
3. Remove fuel hose. Refer to INTAKE MANIFOLD .
   • Do not twist or kink fuel hose because it is plastic hose.
   • Do not remove fuel hose from quick connector.
   • Keep the original fuel hose to be free from intrusion of dust or foreign substances with a suitable cover.
4. Install the fuel pressure gauge as shown in the figure.
   • Wipe off oil or dirt from hose insertion part using cloth moistened with gasoline.
   • Apply proper amount of gasoline between top of the fuel tube and No. 1 spool.
   • Insert fuel hose for fuel pressure check until it touches the No. 1 spool on fuel tube.
   • Use NISSAN genuine hose clamp (part number: 16439 N4710 or 16439 40U00).
   • When reconnecting fuel line, always use new clamps.
     Fig 1: Identifying Fuel Hose Clamp

     Courtesy of NISSAN MOTOR CO., U.S.A.
   • When reconnecting fuel hose, check the original fuel hose for damage and abnormality.
   • Use a torque driver to tighten clamps.
   • Install hose clamp to the position within 1 - 2 mm (0.04 - 0.08 in).

     Tightening torque: 1 - 1.5 N.m (0.1 -0.15 kg-m, 9-13 in-lb) 

   • Make sure that clamp screw does not contact adjacent parts.
5. After connecting fuel hose for fuel pressure check, pull the hose with a force of approximately 98 N (10 kg, 22 lb) to confirm fuel tube does not come off.
6. Turn ignition switch ON, and check for fuel leakage.
7. Start engine and check for fuel leakage.
   Fig 2: Installing Fuel Pressure Gauge

   Courtesy of NISSAN MOTOR CO., U.S.A.
8. Read the indication of fuel pressure gauge.
   • Do not perform fuel pressure check with system operating. Fuel pressure gauge may indicate false readings.
   • During fuel pressure check, confirm for fuel leakage from fuel connection every 3 minutes.

     At idling: Approximately 350 kPa (3.57 kg/cm ²  , 51 psi) 

9. If result is unsatisfactory, go to next step.
10. Check the following.
    • Fuel hoses and fuel tubes for clogging
    • Fuel filter for clogging
    • Fuel pump
    • Fuel pressure regulator for clogging

If OK, replace fuel pressure regulator.

If NG, repair or replace.