🔧 Highlander - Fuel Pump Replacement

Your Highlander’s fuel pump sits inside the fuel tank as part of an in-tank “fuel pump module.” Replacing it usually means accessing the module from inside the cabin (under the rear seat), swapping the module (or pump motor), and sealing everything back up so there are no fuel leaks.

Difficulty Level: Advanced | Estimated Time: 2.0-4.0 hours

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⚠️ Safety & Precautions

• 🧯 Work outdoors or in a well-ventilated area; fuel fumes are flammable.
• 🚫 No smoking, no sparks, no heat guns, no trouble lights with hot bulbs.
• 🔋 Disconnect the negative battery cable before opening the fuel system.
• ⛽ Relieve fuel pressure before disconnecting any fuel lines to prevent spray.
• 🧤 Wear safety glasses and fuel-resistant gloves; gasoline irritates skin and eyes.
• 🧼 Clean dirt around the access cover and module before opening; dirt in the tank can damage the new pump.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Fire extinguisher (Class B)
• 10mm socket
• 12mm socket
• 3/8" drive ratchet
• 3" extension (3/8" drive)
• Torque wrench (10-100 Nm range)
• Trim removal tool set
• Small flat-blade screwdriver
• Needle-nose pliers
• Fuel line disconnect tool set
• Brass punch
• Small hammer
• Toyota fuel pump lock ring wrench (specialty)
• Shop towels
• Plastic scraper
• Marker pen

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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 pump lock ring - Qty: 1
• Fuel line retaining clip(s) - Qty: 1

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📋 Before You Begin

• Park your Highlander on level ground and open the driver window (so you can unlock it if needed).
• Run the fuel level down if possible; a fuller tank increases spill risk.
• Locate the fuse/relay box cover diagram first; you’ll remove the fuel pump power to relieve pressure.
• Have a clean spot ready to place the fuel pump module (avoid getting dirt on it).

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Open the under-hood fuse/relay box and use the diagram on the cover to identify the Fuel Pump (F/P) fuse/relay (some covers label it differently).
• Pull the fuel pump fuse/relay using needle-nose pliers.
• Start the engine and let it idle until it stalls, then crank for 3 more seconds to bleed off leftover pressure.
• Turn ignition OFF and reinstall nothing yet.

Step 2: Disconnect the battery

• Use a 10mm socket to disconnect the negative battery cable and isolate it so it can’t spring back.

Step 3: Remove the rear seat cushion (access depends on seat style)

• If your second row is a bench: use a trim removal tool set to pop the front cushion clips up, then lift the cushion out.
• If your second row is captain’s chairs: you’ll typically remove the center/trim panels first using a trim removal tool set, then lift/remove the cushion section that covers the service area.
• Take pictures before unplugging anything.

Step 4: Remove the fuel pump service hole cover

• Find the metal access cover over the fuel pump area under the seat.
• Use a trim removal tool set and small flat-blade screwdriver to lift any butyl (sticky sealant) edges without bending the cover.
• Remove the cover fasteners using a 10mm socket.
• Reinstall spec (if applicable): Torque to 7.5 Nm (66 in-lbs).

Step 5: Disconnect the fuel pump electrical connector and fuel line(s)

• Unplug the fuel pump connector by releasing the tab using a small flat-blade screwdriver (don’t force it).
• Place shop towels around the line connection to catch drips.
• Release the fuel line quick-connect using the fuel line disconnect tool set (a quick-connect is a push-on fitting with internal locks).
• Remove any retaining clip with needle-nose pliers and replace it if it’s distorted.

Step 6: Clean and mark the module orientation

• Use shop towels to clean dust around the lock ring and module flange.
• Use a marker pen to mark the module position relative to the tank so you install it the same way.

Step 7: Remove the fuel pump lock ring

• Preferred method: use the Toyota fuel pump lock ring wrench (specialty) with a 3/8" drive ratchet to loosen the ring.
• Alternate method (only if needed): use a brass punch and small hammer to tap the ring counterclockwise (brass helps reduce spark risk).

Step 8: Remove the fuel pump module

• Lift the module straight up slowly, guiding the fuel level float arm out without bending it.
• Let fuel drain from the module into the tank for a few seconds, then remove it.
• Remove the old seal/O-ring from the tank opening using a plastic scraper (do not gouge the sealing surface).

Step 9: Install the new seal and module

• Install the new tank seal/O-ring fully seated in its groove.
• Lower the new fuel pump module in, matching your marker pen alignment marks.
• Make sure the seal stays in place and does not pinch.

Step 10: Install and tighten the lock ring

• Thread the new lock ring on by hand first to avoid cross-threading.
• Use the Toyota fuel pump lock ring wrench (specialty) and torque wrench to tighten: Torque to 68 Nm (50 ft-lbs).

Step 11: Reconnect fuel line(s) and electrical connector

• Push the fuel line on until it clicks, then gently tug-check it by hand.
• Install any new retaining clip(s) using needle-nose pliers.
• Reconnect the electrical connector until the tab clicks.

Step 12: Reinstall the service cover and rear seat

• Reinstall the access cover using a 10mm socket.
• Reinstall spec (if applicable): Torque to 7.5 Nm (66 in-lbs).
• Reinstall the rear seat cushion and trim using a trim removal tool set and any removed 10mm socket/12mm socket fasteners.

Step 13: Restore power and prime the fuel system

• Reinstall the fuel pump fuse/relay in the under-hood box.
• Reconnect the negative battery cable using a 10mm socket.
• Turn ignition ON (engine OFF) for 5 seconds, then OFF for 5 seconds; repeat 3 times to prime the system.

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✅ After Repair

• Start the engine and let it idle for 2 minutes.
• Check carefully for fuel smell or any dampness at the line connection and lock-ring area.
• If the engine cranks longer than normal, repeat the prime cycle (ON/OFF) a few more times.
• If you have a check engine light after the repair, scan and clear codes, then recheck for leaks.

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💰 DIY vs Shop Cost

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

DIY Cost: $300-$900 (parts only)

You Save: $600-$700 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2.0-4.0 hours.

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🎯 Ready to get started?

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