🔧 Prius - Fuel Pump Replacement

On your Prius, the fuel pump is inside the fuel tank as part of an in-tank pump module. Replacement involves accessing it from inside the cabin (under the rear seat), disconnecting fuel lines and wiring, then swapping the pump/module and resealing everything to prevent fuel vapor leaks.

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

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⚠️ Safety & Precautions

• ⚠️ Work outdoors or in strong ventilation; fuel vapors ignite easily.
• ⚠️ No smoking, no sparks, no hot work lights; use LED lighting.
• ⚠️ Keep a Class B fire extinguisher nearby.
• ⚠️ Wear gloves and safety glasses; fuel can irritate skin/eyes.
• ⚠️ Hybrid precaution: avoid disturbing orange high-voltage cables/connectors.
• ⚠️ Battery disconnect: recommended to disconnect the 12V negative terminal before unplugging the pump wiring.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 3/8" drive ratchet
• 3/8" drive torque wrench
• Trim removal tool set
• Flathead screwdriver
• Needle-nose pliers
• Pick tool
• Fuel line disconnect tool set
• Brass punch
• Dead-blow hammer
• Shop towels
• Catch pan
• Nitrile gloves
• Safety glasses
• Battery terminal wrench (10mm)

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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 pump strainer (sock filter) - Qty: 1
• New one-time-use hose clamps (if equipped) - Qty: 2-4

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📋 Before You Begin

• Park on level ground, set the parking brake, and open the rear hatch for light/airflow.
• Run the fuel level low if possible (about 1/4 tank) to reduce spill risk.
• Disconnect the 12V battery negative terminal using a 10mm socket.
• Relieve fuel pressure before disconnecting lines (steps below).

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel system pressure

• Remove the key fob from the vehicle area and keep it away from the Prius.
• With the 12V negative already disconnected (use 10mm socket), wait 2–3 minutes.
• Place shop towels under the fuel line connection area later; a small amount of fuel may still drip.
• Fuel pressure can spray—go slow.

Step 2: Remove the rear seat cushion

• Use a trim removal tool set to release the seat cushion clips (lift up at the front edge).
• If your Prius uses bolts for the cushion, remove them using a 12mm socket and 3/8" drive ratchet.

Step 3: Open the fuel pump access cover

• Locate the service/access cover under the seat area.
• Use a trim removal tool set and flathead screwdriver to lift/remove the cover and any sealant pad carefully.
• Clean loose dust around the module using shop towels so dirt doesn’t fall into the tank.

Step 4: Disconnect the electrical connector and fuel lines

• Unplug the pump electrical connector (release tab using a pick tool if needed).
• Place a catch pan and shop towels under the line connections.
• Disconnect the quick-connect fuel line using a fuel line disconnect tool set (a quick-connect is a snap-on fitting that locks with internal tabs).
• If any small hoses use clamps, remove with needle-nose pliers and replace clamps during reassembly.

Step 5: Remove the locking ring and lift out the pump module

• Mark the locking ring position relative to the tank using a flathead screwdriver (for reference).
• Use a brass punch and dead-blow hammer to tap the lock ring loose (brass helps reduce spark risk).
• Lift the module straight up slowly; angle as needed to clear the float arm without bending it.
• Drain the module into the catch pan and set it on shop towels.

Step 6: Replace the seal and install the new pump/module

• Remove the old tank seal (O-ring) and wipe the sealing surface with shop towels.
• Install the new fuel pump tank seal (O-ring/gasket) in the correct groove (no twists).
• Install the new module into the tank, aligning the locating marks/tabs.
• Reinstall the lock ring and tighten it.
• Torque: Torque the lock ring to Toyota factory specification (lock-ring torque varies by service info; do not guess).

Step 7: Reconnect lines and wiring, then close the access cover

• Reconnect the fuel line until it clicks; lightly tug to confirm it’s locked.
• Reconnect all vapor/return hoses and install new clamps using needle-nose pliers.
• Plug in the electrical connector.
• Reinstall the access cover using the trim removal tool set and flathead screwdriver.

Step 8: Reinstall the rear seat and reconnect the 12V battery

• Reinstall the seat cushion and any bolts using a 12mm socket and 3/8" drive ratchet.
• Torque: Torque seat bolts to Toyota factory specification (varies by seat hardware).
• Reconnect the 12V battery negative terminal using a 10mm socket.

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✅ After Repair

• Power the Prius ON (READY) and let it sit; check for fuel smell immediately.
• Cycle ignition (ON/READY) a couple times to help prime the system, then inspect for leaks at the quick-connect and module seal.
• If you have a scan tool, check for stored fuel pressure/EVAP codes and clear if needed.
• Test drive 5–10 minutes, then recheck for any seepage or fuel odor.

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💰 DIY vs Shop Cost

Shop Cost: $600-$1,200 (parts + labor)

DIY Cost: $180-$650 (parts only)

You Save: $420-$550 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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