This procedure covers removal and replacement of the fuel rail assembly on a 2018-2024 Toyota Camry with the 2.5L I4 engine, including fuel pressure relief and injector disconnection.

Warnings

Tools required

Parts

• Fuel rail assembly (if replacing) × 1 — Use OEM specification
• Fuel injector O-rings (upper and lower) × 8 — Use OEM specification
• Fuel line O-rings × 2 — Use OEM specification
• Fuel rail seal kit (optional) × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cool to the touch
2. Park vehicle on level ground and engage parking brake
3. Disconnect negative battery terminal and wait 90 seconds for airbag system to discharge
4. Cover fenders and surrounding painted surfaces with protective material
5. Relieve fuel system pressure by removing fuel pump relay (EFI2 relay in engine compartment fuse box) and attempting to start engine until it stalls, then crank for 3-5 additional seconds
6. Reinstall fuel pump relay after pressure relief
7. Gather all new O-rings and parts before disassembly

Procedure

1. 1

   Remove engine cover
   Grasp the engine cover firmly and pull upward to disengage the rubber grommets from the mounting posts. The cover is friction-fit and does not use screws on this engine. Set aside in a clean area.
2. 2

   Disconnect air intake duct
   Loosen the hose clamps at both ends of the air intake duct using a flathead screwdriver or 8mm socket. Disconnect the mass airflow sensor electrical connector by pressing the tab and pulling straight out. Remove the intake duct and set aside.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)
3. 3

   Disconnect fuel injector electrical connectors
   Locate all four fuel injector electrical connectors on top of the fuel rail. Press down on the locking tab of each connector while pulling upward to disconnect. Note the routing of the injector harness for reassembly.
4. 4

   Disconnect fuel supply line
   Place shop towels around the fuel supply line connection at the fuel rail to catch residual fuel. Using the appropriate fuel line disconnect tool, press the tool into the quick-connect fitting and pull the fuel line straight out. Inspect the O-ring in the fuel rail connection for damage. A small amount of fuel spillage is normal.
   ⚠Residual fuel will spray out even after pressure relief. Keep towels in place and avoid contact with eyes.
5. 5

   Remove fuel rail mounting bolts
   Locate the two fuel rail mounting bolts on the intake manifold side of the fuel rail. Using a 12mm socket, remove both bolts completely and set aside. The fuel rail is now only held in place by the injector seals.
   Torque spec

   Fuel Rail Bolts12 Nm (9 lb-ft)
6. 6

   Remove fuel rail assembly
   Grasp the fuel rail firmly with both hands. Pull upward with steady, even pressure to disengage all four fuel injectors from their bores in the intake manifold. The injectors are sealed with O-rings and may require moderate force. Rock the rail gently side-to-side if needed, but do not pry against the injectors. Once free, carefully lift the entire fuel rail and injector assembly away from the engine.
   ⚠Do not pull on individual injectors or use excessive force. Damage to injector tips or seals can occur.
7. 7

   Inspect and clean injector bores
   Inspect the four injector bores in the intake manifold for debris, carbon buildup, or old O-ring material. Clean each bore thoroughly using a clean shop towel. Do not allow debris to fall into the intake manifold. Check that the lower O-ring seats in each bore are undamaged.
8. 8

   Replace fuel injector O-rings
   If reusing the fuel rail and injectors, remove and replace all O-rings. Each injector has two O-rings: upper (fuel rail side) and lower (intake manifold side). Carefully remove old O-rings using a pick, taking care not to scratch the injector body. Lightly lubricate new O-rings with clean gasoline or light oil before installing. Ensure O-rings are seated properly in their grooves.
9. 9

   Install fuel rail assembly
   Ensure all new O-rings are in place and lightly lubricated. Position the fuel rail assembly above the intake manifold, aligning all four injectors with their respective bores. Press downward firmly and evenly on the fuel rail until all injectors are fully seated in the manifold. The rail should sit flush against its mounting surface.
10. 10

    Install fuel rail mounting bolts
    Install both fuel rail mounting bolts by hand to ensure proper thread engagement. Using a torque wrench, tighten bolts to specification in a cross pattern to ensure even seating of all injectors.
    Torque spec

    Fuel Rail Bolts12 Nm (9 lb-ft)
11. 11

    Reconnect fuel supply line
    Install a new O-ring onto the fuel supply line connection if not already present. Push the fuel line straight into the fuel rail quick-connect fitting until you hear and feel a distinct click. Gently tug on the line to verify it is locked in place.
    ℹ️The line must click into place. An improperly connected line will cause fuel leaks and potential fire hazard.
12. 12

    Reconnect electrical connections
    Reconnect all four fuel injector electrical connectors by pushing down firmly until each connector clicks into place. Route the injector harness according to original position. Reconnect the mass airflow sensor connector.
13. 13

    Reinstall air intake duct and engine cover
    Position the air intake duct and tighten hose clamps securely. Reinstall the engine cover by aligning the rubber grommets with the mounting posts and pressing down firmly until seated.
    Torque spec

    Hose Clamps3 Nm (2 lb-ft)

Reassembly

1. Reconnect negative battery terminal
2. Cycle ignition key to ON position (without starting) three times, waiting 5 seconds between cycles, to prime fuel system
3. Inspect all fuel connections for leaks before starting engine
4. Start engine and allow to idle for 2 minutes while carefully inspecting fuel rail and supply line connections for any fuel seepage

Verification

• With engine running, check all fuel injector connections and fuel supply line for leaks using a flashlight
• Check for proper idle quality and smooth engine operation with no misfires
• Verify no fuel odor is present in engine compartment
• Take vehicle for brief test drive and recheck all connections after engine reaches operating temperature
• Scan for diagnostic trouble codes to ensure no injector circuit faults are present

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