🔧 Highlander - Fuel Pump Replacement

On your Highlander, the fuel pump is part of an in-tank module that sits under an access cover beneath the rear seat area. The job is mostly about working cleanly, relieving fuel pressure safely, and resealing the tank opening so you don’t get fuel smell or leaks.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

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⚠️ Safety & Precautions

• ⚠️ Work outside or in a very well-ventilated area—fuel vapors are flammable.
• ⚠️ No smoking, no heat guns, no shop lights with hot bulbs near the open tank.
• ⚠️ Relieve fuel pressure before disconnecting any fuel line to prevent spray.
• ⚠️ Disconnect the negative battery cable before opening the pump cover.
• ⚠️ Keep dirt out of the tank—contamination can damage the new pump.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 3" extension (1/4")
• Trim removal tool set
• Small flat-blade screwdriver
• Fuel line disconnect tool set
• Brass punch set
• Small hammer
• Needle-nose pliers
• Torque wrench (inch-pound)
• Shop towels
• Catch pan
• Flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel pump module assembly - Qty: 1
• Fuel pump module seal / tank O-ring gasket - Qty: 1
• Fuel strainer (sock filter) - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Lower the fuel level if possible (under 1/2 tank is easier and safer).
• Open the fuel door and loosen the gas cap to reduce tank pressure.
• Relieve fuel pressure: remove the fuel pump/EFI fuse or relay (owner’s manual fuse box chart), start the engine, and let it run until it stalls. Crank for 3 seconds more.
• Disconnect the battery: use a 10mm socket to remove the negative cable and isolate it so it can’t spring back.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the fuel pump service cover

• Move the rear seat(s) forward as needed and remove the rear seat cushion or access trim using a trim removal tool set.
• Locate the metal service cover over the tank opening and remove fasteners using a 10mm socket and 1/4" drive ratchet.
• Lift the cover and set it aside. Use a flashlight (not a hot work light).

Step 2: Clean the area (important)

• Use shop towels to wipe dust and grit away from the top of the module and surrounding metal.
• Clean first—dirt in the tank causes repeat failures.

Step 3: Disconnect the electrical connector

• Press the lock tab and unplug the pump/module connector by hand or with a small flat-blade screwdriver if needed.

Step 4: Disconnect the fuel line(s)

• Place a catch pan and shop towels under the connection.
• Release the quick-connect fitting using a fuel line disconnect tool set.
• Expect a small amount of fuel to drip—catch it and wipe immediately.

Step 5: Remove the lock ring (retaining ring)

• Mark the current position of the ring to the tank with a small flat-blade screwdriver (a simple reference mark helps on reassembly).
• Use a brass punch set and small hammer to tap the lock ring counterclockwise until it releases. (Brass is softer and reduces spark risk.)
• Lift the lock ring off and set it aside.

Step 6: Remove the fuel pump module

• Carefully lift the module straight up. Tilt it as needed to clear the float arm (fuel level sender) without bending it.
• Let fuel drain off the module into the tank; use shop towels to protect the interior.
• Remove the old tank seal/O-ring from the opening using a trim removal tool set (avoid scratching the sealing surface).

Step 7: Install the new seal and module

• Install the new seal/O-ring into the tank opening by hand. Make sure it sits flat and is not twisted.
• Lower the new module in carefully, guiding the float arm in without forcing it.

Step 8: Reinstall the lock ring

• Set the lock ring in place and start it by hand.
• Use the brass punch set and small hammer to tap it clockwise until it fully seats against the stops/alignment marks.
• If your module uses small fasteners (some variants do): tighten evenly with a torque wrench (inch-pound) and 10mm socket to the spec printed in the service instructions for the part. Even tightening prevents fuel smell.

Step 9: Reconnect fuel line(s) and wiring

• Reconnect the fuel line until it clicks. Gently tug to confirm it’s locked.
• Reconnect the electrical connector until it clicks.

Step 10: Reinstall the service cover and seat trim

• Reinstall the service cover using a 10mm socket and 1/4" drive ratchet.
• Reinstall the seat cushion/trim using the trim removal tool set.

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✅ After Repair

• Reconnect the battery negative cable using a 10mm socket.
• Prime the system: turn ignition ON (don’t crank) for 5 seconds, OFF for 5 seconds—repeat 3 times.
• Start the engine and let it idle. Inspect the top of the module and fuel line connection for seepage.
• Check for fuel smell in the cabin after a short drive—smell usually means the lock ring or seal isn’t seated.
• If a Check Engine light appears, scan for codes (often from a connector not fully seated).

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💰 DIY vs Shop Cost

Shop Cost: $900-$1,600 (parts + labor)

DIY Cost: $250-$650 (parts only)

You Save: $650-$950 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-4 hours.

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🎯 Ready to get started?

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