🔧 Tundra - Fuel Pump Replacement

On your Tundra, the fuel pump is part of an in-tank fuel pump module. Replacing it usually requires safely lowering the fuel tank, swapping the module (and seal), then reinstalling everything and leak-checking.

Difficulty Level: Advanced | Estimated Time: 4-7 hours

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⚠️ Safety & Precautions

• 🧯 Fuel vapors ignite easily—no smoking, sparks, or hot work lights.
• 🛑 Work on a cool truck; keep a fire extinguisher nearby.
• 🧤 Wear safety glasses and fuel-resistant gloves; fuel can splash.
• 🔌 Disconnect the negative battery cable before disconnecting fuel lines.
• ⛽ Reduce fuel level first (near empty is best); a full tank is very heavy.
• 🚧 Support the tank with a jack before loosening straps; don’t let it drop.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Fuel-resistant gloves
• Fire extinguisher (Class B)
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Socket set (10mm, 12mm, 14mm)
• Ratchet (3/8")
• Extensions (3/8")
• Torque wrench (3/8", 10–150 Nm range)
• Flathead screwdriver
• Pliers
• Hose clamp pliers
• Fuel line quick-disconnect tool set (specialty)
• Transmission jack (specialty)
• Drain pan
• Approved fuel transfer container
• Shop towels
• Paint marker

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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 - Qty: 1
• New hose clamps - Qty: 2-6

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📋 Before You Begin

• 🅿️ Park on level ground, set the parking brake, and chock the front wheels.
• ⛽ Drive until the tank is close to empty (much easier and safer).
• 🔧 Plan to replace the whole module (recommended) rather than just the pump motor.
• 🧠 A “quick-disconnect” is the factory fuel line fitting that releases with a clip—don’t pry aggressively.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Open the hood and remove the fuse/relay box cover.
• Use your owner’s manual label to locate the fuel pump control relay/fuse (often labeled EFI or C/OPN depending on configuration).
• Use pliers to pull the correct relay/fuse.
• Start the engine and let it run until it stalls, then crank for 2–3 seconds to bleed off any remaining pressure.

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: Raise and support the truck

• Use a floor jack (rated 3-ton minimum) to lift the rear.
• Place jack stands (rated 3-ton minimum) under the frame and lower onto stands.

Step 4: Support the fuel tank

• Position a transmission jack (specialty) (or a floor jack with a wide, stable pad) under the fuel tank.
• Use a paint marker to mark hose routing and connector locations before disconnecting anything.

Step 5: Disconnect filler neck and vent hoses

• Use a flathead screwdriver or hose clamp pliers to loosen clamps (depending on clamp style).
• Carefully twist hoses to break them free, then pull off.
• Tip: Twist first, pull second.

Step 6: Disconnect electrical connectors and fuel lines

• Unplug the tank/pump electrical connectors using your hands (do not pull on wires).
• Place a drain pan and shop towels underneath the fuel line connection.
• Use a fuel line quick-disconnect tool set (specialty) to release the fuel line fitting, then pull the line straight off.
• Tip: Expect a small fuel spill.

Step 7: Remove tank straps and lower the tank

• Use a socket set (12mm, 14mm) with a ratchet and extensions to remove the fuel tank strap bolts.
• Slowly lower the tank with the transmission jack (specialty), stopping to check for any remaining hoses/wires.
• Once clear, lower enough to access the top of the fuel pump module.
• Torque to Toyota specification (use OEM service info for exact value).

Step 8: Clean the area around the fuel pump module

• Use shop towels to wipe dirt away from the top of the tank and around the module ring.
• Do not let dirt fall into the tank opening.

Step 9: Remove the fuel pump module

• Disconnect any remaining module hoses/connectors using pliers as needed.
• Remove the module retaining ring/fasteners using the appropriate socket set (varies by module style).
• Lift the module straight up carefully; angle as needed to clear the float arm (fuel level sender).
• Remove the old tank seal O-ring.

Step 10: Install the new module and seal

• Install the new fuel pump module tank seal O-ring onto the tank opening (make sure it is fully seated and not twisted).
• Lower the new module in carefully, keeping the float arm from binding.
• Install and tighten the retaining ring/fasteners evenly using the correct socket and a torque wrench.
• Torque to Toyota specification (use OEM service info for exact value).

Step 11: Reinstall the tank

• Raise the tank into position using the transmission jack (specialty).
• Reconnect the electrical connectors and fuel line until they fully “click” in place.
• Reconnect filler and vent hoses and install new hose clamps using a flathead screwdriver or hose clamp pliers.
• Install the tank straps and bolts using the socket set (12mm, 14mm) and ratchet.
• Torque to Toyota specification (use OEM service info for exact value).

Step 12: Restore power and prime the fuel system

• Reinstall the fuel pump relay/fuse by hand.
• Reconnect the negative battery cable using a 10mm socket.
• Turn the key to ON (engine off) for 5 seconds, then OFF. Repeat 3–4 times to build fuel pressure.

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✅ After Repair

• 🔍 Start the engine and inspect for leaks at the fuel line connection and around the tank area.
• 🧪 If you smell fuel, shut it off immediately and recheck quick-connect seating and hose clamps.
• 🚗 Road test for 10–15 minutes, then recheck for leaks again.
• 🛠️ If a check engine light appears, a scan tool can read codes, but leaks are the first thing to verify.

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💰 DIY vs Shop Cost

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

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

You Save: $250-$1,000 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 4-7 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.