FixVault
Home › Infiniti › 2003 › QX4 4WD › Repair and Diagnosis (Single Page) › Engine Performance › Fuel Delivery › Fuel System › Fuel System › Removal And Installation › Fuel Pump And Fuel Level Sensor Unit

Fuel Pump And Fuel Level Sensor Unit

Fig 1: Displaying Fuel Pump & Fuel Level Sensor Unit & Torque Specification
G02208463Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Release fuel pressure from fuel line.

    Refer to FUEL PRESSURE RELEASE .

  2. Remove inspection hole cover located behind the rear seat.
  3. Disconnect harness connectors and fuel tubes from upper plate of fuel level sensor unit.
    • Put mating marks on tubes for correct installation.
  4. Remove fuel level sensor retainer and fuel level sensor unit
  5. Disconnect the quick connectors as follows.
    • Hold the sides of the connector, push in tabs and pull out the tube.
    • If the connector and the tube are stuck together, push and pull several times until they start to move. Then disconnect them by pulling.
      Fig 2: Disconnecting Quick Connectors
      G02208464Courtesy of NISSAN MOTOR CO., U.S.A.
      CAUTION:
      • The quick connector can be removed when the tabs are completely depressed. Do not twist it more than necessary.
      • Do not use any tools to remove the quick connector.
      • Keep the resin tube away from heat. Be especially careful when welding near the tube.
      • Prevent acid liquid such as battery electrolyte, etc. from getting on the resin tube.
      • Do not bend or twist the tube during installation and removal.
      • Only when the quick connector is replaced, remove the remaining retainer on the fuel level sensor unit. (Feed tube)
      • When the fuel level sensor unit is replaced, also replace the retainer with a new one [Yellow colored retainer]. (Feed tube)
        Fig 3: Identifying Quick Connector Connection (Cross-Section) & Disconnection
        G02208465Courtesy of NISSAN MOTOR CO., U.S.A.
      • Press fuel tube and fuel level sensor unit as shown in the figure. Disconnect the joint by pushing tab and pull out fuel tube. (Return tube)
        Fig 4: Removing Fuel Return Tube
        G02208466Courtesy of NISSAN MOTOR CO., U.S.A.
      • To keep the connecting portion clean and to avoid damage and foreign materials, cover them completely with plastic bags or something similar.
        Fig 5: Displaying Precautions For Fuel Return Tube
        G02208467Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Remove fuel pump with bracket while lifting the pawl of the fuel pump bracket upward.
    Fig 6: Removing Fuel Pump Assembly
    G02208468Courtesy of NISSAN MOTOR CO., U.S.A.
  7. To install, reverse the removal procedure.
    • Connect the quick connectors as follows.
      1. Be sure that the connecting portion is clean and smooth.
      2. Align mating marks.
      3. Insert tube straight into the connector aligning each center until you hear a click.
      4. After connecting, make sure that the connection is secure by following method.
        1. Pull the tube and the connector to make sure they are securely connected.
        2. Visually confirm that the two retainer tabs are connected to the connector.
          Fig 7: Connecting Quick Connectors
          G02208469Courtesy of NISSAN MOTOR CO., U.S.A.
    • Face fuel level sensor unit as shown in the figure, and install it with knock pin on back aligned with knock pin hole on fuel tank.
      Fig 8: Identifying Knock Pin & Hose Connector
      G02208470Courtesy of NISSAN MOTOR CO., U.S.A.
About FixVault