Fuel Injector - Single

Replace a single faulty fuel injector on the 2017 Maserati Levante 3.0L V6 Twin Turbo engine, including fuel system depressurization, fuel rail removal, and injector replacement.

Warnings

Tools required

Parts

• Fuel injector × 1 — Use OEM specification
• Fuel injector O-ring seal kit × 1 — Upper and lower O-rings
• Fuel line O-rings × 2 — Use OEM specification
• Fuel rail seal/gasket (if damaged) × 1 — Inspect before ordering

Preparation

1. Ensure engine is completely cold to the touch
2. Park vehicle on level surface and engage parking brake
3. Disconnect negative battery terminal and wait 2 minutes for system capacitor discharge
4. Remove engine cover by removing cover screws
5. Place shop towels around work area to absorb residual fuel
6. Have fuel-safe container ready to catch fuel spillage

Procedure

1. 1

   Depressurize fuel system
   Locate the fuel pressure test port on the fuel rail. Attach fuel pressure gauge to the Schrader valve. Slowly open the valve to release fuel pressure into a fuel-safe container. Monitor gauge until pressure reads zero. Close valve and remove gauge. Residual fuel will remain in the lines.
   ⚠️Fuel will spray from test port. Keep face and ignition sources away. Wear safety glasses and fuel-resistant gloves.
2. 2

   Disconnect fuel supply line
   Identify the fuel supply line connection at the fuel rail. Use appropriate fuel line disconnect tool to release the quick-connect fitting. Gently pull the fuel line straight off the rail. Place shop towels underneath to catch residual fuel. Cap or plug the fuel line to prevent contamination.
   Torque spec

   Fuel Line Fittings25 Nm (18 lb-ft)
3. 3

   Disconnect electrical connectors
   Locate the injector electrical connectors for all six injectors. Press the release tab on each connector and carefully pull straight up to disconnect. Mark or photograph the connector positions if not clearly labeled. Move wiring harness aside to access fuel rail bolts.
   ⚠Do not pull on wires themselves. Press release tabs fully before pulling connectors.
4. 4

   Remove fuel rail mounting bolts
   Locate the fuel rail mounting bolts (typically 4 bolts securing the rail to the intake manifold). Remove bolts in a criss-cross pattern working from outside toward center. Keep bolts organized for reinstallation. Note any brackets or clips attached to the fuel rail.
   Torque spec

   Fuel Rail Bolts12 Nm (9 lb-ft)
5. 5

   Remove fuel rail assembly
   Carefully pull the entire fuel rail upward with even pressure. The injectors will remain attached to the rail and pull out of the intake manifold. Work the rail side-to-side gently if resistance is felt. Do not pry against aluminum components. Once free, place rail on clean work surface with injectors facing up.
   ⚠Use caution not to damage injector tips or O-rings during removal. Fuel will drip from injectors and rail.
6. 6

   Remove faulty injector from rail
   Identify the faulty injector position. Note the injector retaining clip orientation. Use a flat blade screwdriver to carefully pry open the retaining clip and slide it off the injector. Pull the injector straight out of the fuel rail with a gentle twisting motion. If stuck, use plastic mallet to gently tap injector body.
   ℹ️Some fuel will spill from the rail opening. Have shop towels ready.
7. 7

   Remove old O-rings and clean
   Remove and discard both the upper (fuel rail side) and lower (intake manifold side) O-rings from the old injector. Use pick tool if needed but avoid scratching sealing surfaces. Clean the fuel rail injector bore with non-metallic brush and shop towels. Remove any debris or old O-ring material. Inspect intake manifold injector bore and clean similarly.
   ⚠Do not scratch or gouge O-ring sealing surfaces on fuel rail or intake manifold.
8. 8

   Prepare new injector
   Remove new injector from packaging. Install new upper O-ring onto the fuel rail end of the injector. Install new lower O-ring onto the intake manifold end. Lightly lubricate both O-rings with clean engine oil or supplied lubricant. Ensure O-rings are seated properly in their grooves without twisting.
   ℹ️Never reuse old O-rings. Ensure new O-rings match original size and specification.
9. 9

   Install new injector into fuel rail
   Align new injector with fuel rail bore, ensuring electrical connector orientation matches other injectors. Push injector straight into rail with firm, even pressure until fully seated. Install retaining clip in same orientation as removed, ensuring it clicks into place and securely locks injector. Verify injector does not rotate freely.
   ⚠Do not force injector at an angle. It must go in straight to avoid damaging O-rings.
10. 10

    Reinstall fuel rail assembly
    Apply light coat of clean engine oil to lower injector O-rings. Align all six injectors with their respective intake manifold bores. Press rail down evenly, ensuring all injectors enter their bores simultaneously. Apply firm, even downward pressure until rail seats flush against mounting surface. Do not rock or twist the rail.
    ⚠All injectors must seat properly. If one binds, remove rail and inspect for debris or damaged O-rings.
11. 11

    Install fuel rail mounting bolts
    Thread all fuel rail mounting bolts by hand first to ensure proper alignment. Tighten bolts in a criss-cross pattern using torque wrench to specification. Do not overtighten as this can crack the fuel rail or strip aluminum threads. Verify rail is secure and all injectors remain properly seated.
    Torque spec

    Fuel Rail Bolts12 Nm (9 lb-ft)
12. 12

    Reconnect electrical connectors and fuel line
    Reconnect each injector electrical connector, ensuring they click into place. Verify secure connection by gently tugging on each connector. Install new O-rings onto fuel supply line if removed. Reconnect fuel supply line to rail, pushing firmly until quick-connect fitting clicks. Tug on line to verify secure connection.
    ⚠Replace fuel line O-rings with new components. Ensure positive click when connecting fuel line.
    Torque spec

    Fuel Line Fittings25 Nm (18 lb-ft)
13. 13

    Reinstall engine cover
    Position engine cover back onto mounting points. Install and tighten cover screws to specification using torque wrench. Ensure all clips and fasteners are properly engaged.
    Torque spec

    Cover Screws11 Nm (8 lb-ft)
14. 14

    Prime fuel system and check for leaks
    Reconnect negative battery terminal. Turn ignition to ON position (do not start) for 5 seconds, then OFF. Repeat this cycle 3-4 times to prime fuel system and build pressure. Inspect all fuel connections, rail, and new injector for any signs of fuel leakage. Look for wet spots or fuel odor.
    ⚠️Do not proceed to engine start if any fuel leaks are detected. Depressurize system and repair leaks immediately.

Reassembly

1. Double-check all electrical connectors are fully seated and locked
2. Verify fuel line quick-connect is secure with positive retention
3. Confirm all fuel rail mounting bolts are torqued to specification
4. Ensure no tools or shop towels are left in engine bay
5. Clean any spilled fuel from engine surfaces before starting

Verification

• Start engine and allow to idle for 2 minutes while monitoring for fuel leaks at rail and injector connections
• Check for smooth idle with no misfires or rough running
• Use scan tool to verify no fuel injector fault codes are present
• Rev engine to 2500 RPM briefly and recheck all connections for leaks
• Verify fuel pressure at idle is within specification (typically 55-60 psi for this engine)
• Test drive vehicle to confirm proper operation under load with no hesitation or misfires

Related trouble codes on this vehicle

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