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Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1507 (Engine Control System) >> Basic Service Procedure >> Fuel Pressure Check >> Fuel Pressure Check >> Method A
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Method A

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • The fuel hose connection method used when taking fuel pressure check must not be used for other purposes.
  • Be careful not to scratch or put debris around connection area when servicing, so that the quick connector maintains sealability with O-rings inside.
  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.
      • Fig 1: Inserting Fuel Hose
      G02446757Courtesy of NISSAN MOTOR CO., U.S.A.
    • Use NISSAN genuine hose clamp (part number: 16439 N4710 or 16439 40U00).
    • When reconnecting fuel line, always use new clamps.
    • 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 - 0.08in).
      • Tightening torque: 1 - 1.5 Nm (0.1 - 0.15 kg-m, 9 - 13in-lb) 
    • Make sure that clamp screw does not contact adjacent parts.
      Fig 2: Installing Fuel Pressure Gauge
      G02446758Courtesy of NISSAN MOTOR CO., U.S.A.
  5. After connecting fuel hose for fuel pressure check, pull the hose with a force of approximately 98 N (10 kg, 22lb) 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.
  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.

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