🔧 Highlander - Fuel Pump Replacement

On your Highlander, the fuel pump is part of an in-tank fuel pump module. Replacement typically involves relieving fuel pressure, accessing the pump from inside the vehicle (usually under the rear seat), disconnecting lines/wiring, then swapping the module and sealing it back up.

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 ignite easily.
• ⚠️ No smoking, no sparks, no drop lights with hot bulbs; use an LED work light.
• ⚠️ Relieve fuel pressure before disconnecting any fuel line to avoid spray.
• ⚠️ Disconnect the negative battery terminal before opening the tank/pump area.
• ⚠️ Keep a Class B fire extinguisher nearby.
• ⚠️ Clean the area before opening the tank to keep dirt out (dirt can ruin the new pump).

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 3/8" ratchet
• 3" extension
• Torque wrench (3/8")
• Phillips screwdriver #2
• Trim removal tool
• Needle-nose pliers
• Plastic pick tool
• Brass punch
• Small hammer
• Shop vacuum
• Brake cleaner spray
• Shop towels
• Fuel-safe drain pan
• Nitrile gloves
• Safety glasses
• LED work light
• OBD2 scan tool

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel pump module assembly - Qty: 1
• Fuel pump tank seal / O-ring gasket - Qty: 1
• Fuel line retaining clips - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the fuel door and loosen the gas cap to help release tank vapor pressure.
• Relieve fuel pressure (steps below) before disconnecting any fuel line.
• Disconnect the negative battery terminal using a 10mm socket.
• Less fuel in the tank makes this easier.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Open the hood and remove the engine cover if equipped (pull upward by hand).
• Locate the under-hood fuse/relay box and remove the fuel pump relay using needle-nose pliers.
• Start the engine and let it run until it stalls.
• Crank for 2–3 seconds one more time, then turn the key OFF.
• Reinstall the fuel pump relay.

Step 2: Disconnect the battery

• Use a 10mm socket to disconnect the negative battery terminal and tuck it aside.

Step 3: Access the fuel pump service cover

• Move the front seats forward for space.
• Remove the rear seat cushion as needed:
  • Use a trim removal tool to release front seat-cushion clips.
  • If bolts are present, remove them with a 12mm socket.
• Find the round/oval service cover and remove fasteners with a Phillips screwdriver #2 or 10mm socket (varies by cover style).

Step 4: Clean the area

• Use a shop vacuum to remove loose dirt around the pump module top.
• Spray brake cleaner spray on a shop towel and wipe the area clean.
• Do not blow debris into the tank.

Step 5: Disconnect the electrical connector(s)

• Press the connector lock tab using a plastic pick tool, then unplug the connector by hand.

Step 6: Disconnect the fuel line(s)

• Place shop towels under the connection and keep a fuel-safe drain pan nearby.
• Release the quick-connect fitting:
  • Use a plastic pick tool to lift the safety lock (if equipped).
  • Squeeze the connector tabs by hand (or use needle-nose pliers gently) and pull the line straight off.
• Cap the line end with a clean towel to keep dirt out.

Step 7: Remove the fuel pump locking ring

• Mark the locking ring and tank with a reference line using a marker (alignment reference).
• Use a brass punch and small hammer to tap the locking ring counterclockwise until it releases.
• Use brass to reduce spark risk.

Step 8: Remove the fuel pump module

• Lift the module straight up carefully; angle it as needed to clear the fuel level float.
• Let fuel drain off the module into a fuel-safe drain pan.
• Remove and discard the old tank seal / O-ring.

Step 9: Install the new seal and module

• Install the new tank seal / O-ring gasket into the tank groove (make sure it sits flat).
• Lower the new module into the tank carefully, guiding the float so it doesn’t bend.
• Align the module’s index marks with the tank marks.

Step 10: Reinstall and tighten the locking ring

• Thread the locking ring on by hand first.
• Use the brass punch and small hammer to tap it clockwise until fully seated and aligned to your reference marks.
• Torque: Use a torque wrench and tighten the locking ring to Toyota specification for your pump module style. (If you tell me whether you have a new complete module or just the pump motor, I’ll give the exact spec path.)

Step 11: Reconnect fuel line(s) and wiring

• Push the fuel line on until it clicks, then pull back gently to confirm it’s locked.
• Install any new fuel line retaining clips if your connector uses them.
• Reconnect the electrical connector until it clicks.

Step 12: Reinstall the service cover and rear seat

• Reinstall the service cover using the Phillips screwdriver #2 or 10mm socket.
• Reinstall the rear seat cushion using a 12mm socket if bolts were removed.
• Torque: Tighten seat bolts with a torque wrench to Toyota specification.

Step 13: Prime the fuel system and check for leaks

• Reconnect the negative battery terminal using a 10mm socket.
• Turn ignition to ON (do not start) for 5 seconds, then OFF. Repeat 3 times to prime.
• Start the engine and idle while you inspect the pump area for any fuel smell or wetness using an LED work light.

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✅ After Repair

• Clear any stored codes and check for new ones using an OBD2 scan tool.
• Road test 10–15 minutes, then recheck for leaks and fuel odor.
• If you get an EVAP code or fuel smell, stop and recheck the seal and line lock.

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💰 DIY vs Shop Cost

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

DIY Cost: $250-$750 (parts only)

You Save: $650-$850 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?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.

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Quick check (so I can make this 100% exact for your Highlander):

• Do you have a complete fuel pump module (pump + sender), or just the pump motor?
• When you lift the rear seat cushion, do you see a service access cover, or is there no cover (meaning the tank must be lowered)?