This procedure covers the removal and replacement of the fuel pressure regulator on a 2019-2024 Toyota RAV4 with the 2.5L I4 gasoline engine. The regulator is typically integrated into the fuel pump assembly or fuel rail depending on vehicle configuration.

Warnings

Tools required

Parts

• Fuel pressure regulator assembly × 1 — 23280-36010 or equivalent OEM
• Fuel rail O-rings/seals × 1 — Use OEM specification
• Fuel line quick-connect seals × 2 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Ensure engine is completely cold before beginning work
3. Disconnect negative battery cable and wait 90 seconds for airbag system to discharge
4. Remove engine cover by pulling upward on front edge then lifting away
5. Locate the fuel pressure regulator on the fuel rail assembly (driver's side of engine)
6. Place drain pan and shop towels under the fuel rail work area to catch fuel spillage

Procedure

1. 1

   Relieve fuel system pressure
   Locate the fuel pump relay in the engine compartment fuse box (relay EFI NO.1). Remove the relay, then attempt to start the engine. The engine will start briefly and stall when fuel pressure is depleted. Crank the engine 2-3 more times to ensure all pressure is relieved. Turn ignition to OFF position.
   ⚠️This step is critical. Skipping fuel pressure relief will cause pressurized fuel spray when lines are disconnected.
2. 2

   Disconnect fuel supply line
   Using the appropriate fuel line disconnect tool, press the tabs on the quick-connect fitting at the fuel rail inlet and pull the fuel supply line straight off. Place the open end into the drain pan. Fuel will drain from the line and rail.
   ⚠Expect residual fuel to spill. Keep drain pan positioned to catch fuel.
3. 3

   Disconnect fuel return line (if equipped)
   If your vehicle has a return-style fuel system, disconnect the fuel return line from the fuel pressure regulator using the fuel line disconnect tool. Many 2019+ RAV4 models use a returnless system; verify your configuration before proceeding with this step.
4. 4

   Remove wire harness connector
   Press the release tab on the fuel pressure regulator electrical connector (if equipped with electronic regulator) and pull connector straight off. Move wiring harness aside to provide clearance.
5. 5

   Remove vacuum hose (if equipped)
   On vehicles with vacuum-operated regulators, disconnect the vacuum hose from the top of the regulator by pulling straight off. Inspect hose for cracks or deterioration and replace if necessary.
6. 6

   Remove fuel pressure regulator mounting hardware
   Remove the two screws securing the fuel pressure regulator to the fuel rail using a 10mm socket or appropriate tool. Support the regulator while removing the second screw to prevent it from falling.
   ⚠Additional fuel may drain when regulator is removed. Keep drain pan in position.
   Torque spec

   Regulator Mounting Screws5 Nm (4 lb-ft)
7. 7

   Remove fuel pressure regulator
   Carefully pull the fuel pressure regulator straight out from the fuel rail. The regulator will have an O-ring seal that must be removed with it. Allow any residual fuel to drain into the pan. Inspect the regulator mounting bore in the fuel rail for debris or damage.
8. 8

   Clean and inspect fuel rail
   Use a clean, lint-free cloth to wipe the regulator mounting surface on the fuel rail. Inspect the bore for scratches, corrosion, or debris. The mating surface must be clean and smooth for proper seal. Do not use abrasive materials that could damage the aluminum rail.
9. 9

   Install new O-ring seals
   Lubricate the new O-ring seal(s) with clean gasoline and install onto the new fuel pressure regulator. Ensure the O-ring is properly seated in its groove and not twisted or damaged.
   ℹ️Never reuse old O-rings. Always install new seals to prevent fuel leaks.
10. 10

    Install new fuel pressure regulator
    Carefully insert the new fuel pressure regulator straight into the fuel rail bore. Push firmly until the regulator is fully seated and the mounting screw holes align. Do not force or angle the regulator during installation to avoid damaging the O-ring seal.
11. 11

    Secure regulator mounting screws
    Install the two regulator mounting screws and tighten in a cross pattern to the specified torque using a torque wrench. This ensures even sealing pressure on the O-ring.
    Torque spec

    Regulator Mounting Screws5 Nm (4 lb-ft)
12. 12

    Reconnect vacuum hose and electrical connector
    If equipped, reconnect the vacuum hose to the top of the regulator, ensuring it is fully seated. Connect the electrical connector (if equipped) until it clicks into place. Verify the connector lock tab is fully engaged.
13. 13

    Reconnect fuel lines
    Install new quick-connect seals if provided with the regulator kit. Push the fuel supply line straight onto the fuel rail fitting until you hear and feel a positive click. Tug on the line to verify it is locked. If equipped with a return line, connect it to the regulator in the same manner.
    ⚠Ensure fuel line quick-connects are fully engaged. Improper connection will cause fuel leaks under pressure.
14. 14

    Reinstall fuel pump relay and battery
    Reinstall the fuel pump relay in the fuse box. Reconnect the negative battery cable. Do not start the engine yet.
15. 15

    Prime fuel system and check for leaks
    Turn the ignition to ON position (do not start engine) for 2 seconds, then OFF. Repeat this cycle 4-5 times to prime the fuel system and build pressure. Carefully inspect all fuel connections, the regulator mounting area, and fuel lines for any signs of leakage. Wipe away any spilled fuel before proceeding.
    ⚠️If any fuel leaks are detected, immediately turn ignition OFF, relieve fuel pressure, and correct the leak before proceeding.

Reassembly

1. Reinstall engine cover by aligning clips and pressing down firmly until all clips engage
2. Clean up any spilled fuel from engine bay and surrounding areas with shop towels
3. Properly dispose of old fuel pressure regulator, contaminated rags, and fuel according to local regulations
4. Double-check that all tools have been removed from engine compartment

Verification

• Start the engine and allow it to idle. Listen for smooth operation and verify no rough idle or stumbling that would indicate fuel pressure issues
• With engine running, carefully inspect all fuel connections and the regulator area for leaks using a flashlight. Look for wet spots or dripping fuel
• Rev engine to 2500-3000 RPM briefly and verify smooth acceleration with no hesitation
• Allow engine to return to idle and verify stable idle speed (typically 650-750 RPM when warm)
• Check for diagnostic trouble codes (DTCs) using an OBD-II scanner. No fuel pressure or fuel trim codes should be present
• After initial test, shut down engine and perform final inspection for leaks after system has been under full pressure
• Take vehicle for brief test drive to verify normal operation under load and various throttle positions

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