🔧 Highlander - Fuel Pump Replacement

On your Highlander, the fuel pump sits inside the fuel tank as part of an in-tank pump/module. The most common service method is through an access cover under the rear seat area (if equipped), so you don’t have to drop the tank.

Difficulty Level: Advanced | Estimated Time: 2.5-5.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work outside or in a very well-ventilated area—fuel vapors are flammable.
• ⚠️ No smoking, no sparks, no hot work lights (use LED).
• ⚠️ Disconnect the 12V battery before opening the tank to reduce spark risk.
• ⚠️ Relieve fuel pressure before disconnecting any fuel line.
• ⚠️ Keep a fire extinguisher rated for fuel fires nearby.
• ⚠️ Clean dirt away before opening the tank—dirt can ruin the new pump/module.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" ratchet
• 3/8" ratchet
• 3" extension
• Trim removal tool set
• Small flathead screwdriver
• Pick tool
• Pliers
• Torque wrench (in-lb)
• Shop vacuum
• Brake cleaner
• Shop towels
• Painter’s tape
• Marker
• Non-sparking brass punch
• Dead blow hammer
• Fuel-safe drain pan
• Nitrile gloves
• Safety glasses
• Fire extinguisher (Class B)

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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 tank seal (O-ring/gasket) - Qty: 1
• Fuel line quick-connect O-rings (if applicable) - Qty: 1 set

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📋 Before You Begin

• 🅿️ Park on level ground, set the parking brake, and open all doors for ventilation.
• 🔋 Disconnect the negative battery cable using a 10mm socket and 1/4" ratchet to prevent accidental sparks; Torque to 44 in-lbs (5 Nm) on reassembly.
• 🧼 Vacuum and wipe the rear seat area using a shop vacuum so no dirt falls into the tank.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Remove the fuel filler cap (gas cap) to release tank vapor pressure.
• If the engine still runs, crank the engine for a few seconds after disabling the pump power (you’ll do this at the pump connector in Step 6). Less pressure = less fuel spray.

Step 2: Remove the rear seat cushion (access method)

• Use a trim removal tool set to carefully release the seat cushion clips (lift up at the front edge of the cushion).
• Set the cushion aside on a clean towel.

Step 3: Find the fuel pump service cover (if equipped)

• Look for a metal or plastic service cover on the floor under the rear seat area.
• Use a trim removal tool set and small flathead screwdriver to remove any fasteners and lift the cover.
• If you do not see a service cover, your Highlander may require lowering the fuel tank (drop-tank method). Tell me and I’ll give you the drop-tank steps.

Step 4: Clean the top of the fuel pump/module

• Use a shop vacuum to remove loose dirt around the module.
• Use brake cleaner and shop towels to wipe the area clean.

Step 5: Label lines and connectors

• Use painter’s tape and a marker to label any hoses/lines so they go back to the same spots.

Step 6: Disconnect the electrical connector

• Press the lock tab and unplug the connector by hand; use a pick tool only if the tab is stubborn.
• A pick tool is a small hooked tool used to lift plastic lock tabs.

Step 7: Disconnect the fuel line(s)

• Wrap the connection with shop towels to catch fuel.
• Release the quick-connector (usually by squeezing the tabs) and pull the line straight off.
• If the connector won’t release, use a pick tool to gently lift the locking clip—do not pry hard.

Step 8: Mark the module position

• Use a marker to mark the tank and the module so you can reinstall in the same orientation.

Step 9: Remove the lock ring/retainer

• Use a non-sparking brass punch and dead blow hammer to tap the lock ring counterclockwise until it releases.
• A lock ring is the large ring that holds the module to the tank.
• Lift the lock ring off and set it aside.

Step 10: Remove the fuel pump/module

• Carefully lift the module straight up while guiding the float arm (fuel level sender) out without bending it.
• Hold it over the opening and let fuel drain into a fuel-safe drain pan.
• Remove the old tank seal (O-ring/gasket) from the tank opening.

Step 11: Install the new seal and module

• Install the new tank seal onto the tank opening (or as supplied with your module).
• Lower the new module in, guiding the float arm in gently.
• Align your marks made in Step 8.

Step 12: Reinstall the lock ring/retainer

• Install the lock ring and tap it clockwise using the non-sparking brass punch and dead blow hammer.
• Tighten until the lock ring is fully seated and aligned to the factory stop/index marks.

Step 13: Reconnect fuel line(s) and electrical

• Push the fuel line on until it clicks; tug lightly to confirm it’s locked.
• Reconnect the electrical connector until it clicks.

Step 14: Reinstall the service cover and rear seat cushion

• Reinstall the service cover using a trim removal tool set and small flathead screwdriver as needed.
• Reinstall the rear seat cushion by aligning it and pressing down firmly until the clips snap in.

Step 15: Reconnect the battery

• Reconnect the negative battery cable using a 10mm socket and 1/4" ratchet; Torque to 44 in-lbs (5 Nm).

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✅ After Repair

• ⛽ Turn the ignition to ON (engine off) for 5 seconds, then OFF; repeat 2–3 times to prime the system.
• 🔍 Start the engine and check carefully for fuel leaks around the pump top and fuel line connection.
• 🛣️ Test drive briefly, then recheck for fuel smell/leaks.
• 🧾 If a check engine light is on, scan for codes—some fuel pressure codes clear after a few drive cycles.

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💰 DIY vs Shop Cost

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

DIY Cost: $250-$700 (parts only)

You Save: $650-$900 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2.5-5.0 hours.

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🎯 Ready to get started?

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