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Home >> Nissan-Datsun >> 2011 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System - Introduction (Qr25DE) >> Service Information >> Basic Service Procedure >> Fuel Pressure Check >> Fuel Pressure Check
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Fuel Pressure Check

CAUTION: Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
NOTE:
  • Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pressure cannot be completely released because B16 models never have fuel return system.
  • Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the quick connector o-ring maintains seal ability.
  • Use Fuel Pressure Gauge Kit [SST (J-44321)] (A) and Fuel Pressure Adapter [SST (J-44321-6)] (B) to check fuel pressure.
  1. Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE ".
  2. Remove fuel hose using Quick Connector Release [SST (J-45488)]. Refer to FUEL INJECTOR AND FUEL TUBE .
    • Never twist or kink fuel hose because it is plastic hose.
    • Never remove fuel hose (1) from quick connector.
    • Keep fuel hose connections clean.
  3. Install Fuel Pressure Adapter [SST (J-44321-6)] and Fuel Pressure Gauge kit [SST (J-44321)] as shown in figure.
    • Never distort or bend fuel rail tube when installing fuel pressure gauge adapter.
    • When reconnecting fuel hose, check the original fuel hose for damage and abnormality.
  4. Turn ignition switch ON (reactivate fuel pump), and check for fuel leakage.
  5. Start engine and check for fuel leakage.
  6. Read the indication of fuel pressure gauge.
    • During fuel pressure check, check for fuel leakage from fuel connection every 3 minutes.
    Fig 1: Installing Fuel Pressure Adapter And Fuel Pressure Gauge Kit
    G07143956Courtesy of NISSAN MOTOR CO., U.S.A.

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

  7. If result is unsatisfactory, GO TO next step.
  8. 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. Refer to "REMOVAL AND INSTALLATION " and "PRECAUTION ".

    If NG, repair or replace.

  9. Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter [SST (J-44321-6)], release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE ".
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