🔧 Impreza - Fuel Pump Replacement

Your Impreza uses an in-tank fuel pump module (under the rear seat). Replacing it means opening the access cover, disconnecting the fuel lines and wiring, swapping the pump/module, then checking carefully for leaks.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

---

⚠️ Safety & Precautions

• ⚠️ Work in a well-ventilated area; fuel vapors are flammable.
• ⚠️ No smoking, no sparks, no hot work lights near the car.
• ⚠️ Wear safety glasses and fuel-resistant gloves; fuel can spray when lines open.
• ⚠️ Disconnect the negative battery cable before opening the tank.
• ⚠️ Keep a fire extinguisher rated for fuel fires nearby.
• ⚠️ Assumption: Rear-seat access panel equipped (common on this Impreza).

---

🔧 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")
• Torque wrench (inch-pound)
• Phillips #2 screwdriver
• Trim removal tool
• Fuel line quick-disconnect tool set (specialty)
• Needle-nose pliers
• Shop towels
• Catch pan
• Permanent marker

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Fuel pump module assembly - Qty: 1
• Fuel pump module seal/O-ring - Qty: 1
• Rear seat access cover butyl seal (if damaged) - Qty: 1

---

📋 Before You Begin

• Park on level ground, set the parking brake, and open a window for ventilation.
• Remove loose items from the back seat area.
• Disconnect the negative battery terminal using a 10mm socket.
• Plan for small fuel spills: place a catch pan and use shop towels.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Open the fuel door and loosen the gas cap to vent the tank.
• In the cabin, prepare towels around the work area for any fuel drips.
• Expect a small spray at the fuel line.

Step 2: Remove the rear seat bottom

• Use a trim removal tool to pop up the seat bottom front clips (pull straight up near each front corner).
• If your seat uses bolts, remove them with a 12mm socket and 3/8" ratchet.
• Lift the seat bottom out and set it aside.

Step 3: Open the fuel pump access panel

• Locate the access cover on the floor under the rear seat area.
• Remove the access cover screws using a Phillips #2 screwdriver.
• Carefully peel back any butyl sealer (sticky strip) with a trim removal tool.

Step 4: Disconnect electrical connector and clean the area

• Unplug the pump module electrical connector by hand (press tab and pull).
• Wipe dirt away with shop towels so debris doesn’t fall into the tank.
• Use a permanent marker to mark the module orientation to the tank (helps reassembly).

Step 5: Disconnect fuel lines

• Place a catch pan and shop towels under the connections.
• Release the quick-connect fuel line(s). Use a fuel line quick-disconnect tool set (specialty) if needed (this tool slides into the fitting to release the internal spring clip).
• Use needle-nose pliers only if there are hose clamps (do not crush plastic fittings).

Step 6: Remove the pump module retaining fasteners

• Remove the retaining nuts/bolts evenly in a crisscross pattern using a 10mm socket, 3/8" ratchet, and 3" extension (3/8").
• Keep hardware clean and organized.
• Torque to Subaru factory specification (use service information for exact value) during reassembly with a torque wrench (inch-pound).

Step 7: Remove the fuel pump module

• Lift the module straight up slowly; angle it as needed to clear the float arm (fuel level sensor).
• Let fuel drip into the catch pan before moving it away from the opening.
• Remove the old seal/O-ring from the tank opening.

Step 8: Install the new seal and pump module

• Install the new fuel pump module seal/O-ring onto the tank opening (make sure it sits flat, not twisted).
• Lower the new module in, keeping your orientation marks aligned.
• Install fasteners finger-tight first, then tighten evenly in a crisscross pattern using a 10mm socket.
• Torque to Subaru factory specification (use service information for exact value) with a torque wrench (inch-pound).

Step 9: Reconnect fuel lines and electrical connector

• Reconnect the fuel line(s) until you feel/hear a positive “click.”
• Gently tug the line(s) by hand to confirm they are locked.
• Reconnect the electrical connector by hand until it clicks.

Step 10: Reinstall access cover and rear seat

• Reinstall the access cover using a Phillips #2 screwdriver.
• If the butyl seal was damaged, install the new rear seat access cover butyl seal.
• Reinstall the rear seat bottom (press down to engage clips). If bolts were removed, tighten with a 12mm socket and 3/8" ratchet.

Step 11: Reconnect the battery and prime the system

• Reconnect the negative battery terminal using a 10mm socket.
• Turn the key to ON (engine OFF) for 3 seconds, then OFF. Repeat 3 times to prime.
• Start the engine and let it idle.

---

✅ After Repair

• With the engine idling, check the pump access area for fuel smell or wetness.
• Shut the engine off and re-check the fuel line connections by touch/visual inspection.
• Test drive 5–10 minutes, then re-check once more for leaks.
• If a check engine light appears, scan the car for codes (often a connector/line not fully seated).

---

💰 DIY vs Shop Cost

Shop Cost: $650-$1,200 (parts + labor)

DIY Cost: $180-$550 (parts only)

You Save: $470-$650 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 hours.

---

🎯 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.