2003 Infiniti I35FACTORY OEM SERVICE PROCEDURE

Removal And Installation

WARNING: This page is about a different car, the 2004 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
  1. Release fuel pressure to zero.
  2. Remove intake manifold collector. Refer to TIMING CHAIN .
  3. Remove fuel tube assemblies in numerical sequence as shown in Fig 1 .
    4. Fig 1: Removing Fuel Tube Assemblies In Numerical Sequence
    G00786336Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Expand and remove clips securing fuel injectors.
    5. Fig 2: Removing Injector
    G00786337Courtesy of NISSAN MOTOR CO., U.S.A.
  5. Extract fuel injectors straight from fuel tubes.
    • Be careful not to damage injector nozzles during removal. 
    • Do not bump or drop fuel injectors. 
  6. Carefully install O-rings.
    • Lubricate O-rings with a smear of engine oil. 
    • Be careful not to damage O-rings with service tools, finger nails or clips. Do not expand or twist O-rings. 
    • Discard old clips; replace with new ones. 
  7. Position clips in grooves on fuel injectors.
    • Make sure that protrusions of fuel injectors are aligned with cutouts of clips after installation. 
      Fig 3: Removing Fuel Damper
      G00786338Courtesy of NISSAN MOTOR CO., U.S.A.
  8. Align protrusions of fuel tubes with those of fuel injectors. Insert fuel injectors straight into fuel tubes.
  9. After properly inserting fuel injectors, check to make sure that fuel tube protrusions are engaged with those of fuel injectors, and that flanges of fuel tubes are engaged with clips.
  10. Tighten fuel tube assembly mounting nuts in numerical sequence (indicated in Fig 4 ) and in two stages.
    Fig 4: Tightening Order Of Fuel Tube Mounting Bolt
    G00786339Courtesy of NISSAN MOTOR CO., U.S.A.

    : Tightening torque N.m (kg-m, ft-lb) 

    1st stage: 

    9.3 - 10.8 (1.0 - 1.1, 6.9 - 7.9) 

    2nd stage: 

    20.6 - 26.5 (2.1 - 2.7, 16 - 19) 

  11. Install all parts removed in reverse order of removal.
    CAUTION: After properly connecting fuel tube assembly to injector and fuel hose, check connection for fuel leakage.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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