🔧 BRZ - Fuel Pump Replacement

On your BRZ, the fuel pump is inside the fuel tank as part of an in-tank pump/module assembly. The job is mostly about working cleanly and safely (fuel fumes!), then swapping the pump/module and sealing everything back up to prevent leaks and fuel smell.

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

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⚠️ Safety & Precautions

• ⚠️ Work outside or in a very well-ventilated area; fuel vapors are highly flammable.
• ⚠️ No smoking, flames, heat guns, drop lights, or spark-making tools near the car.
• ⚠️ Wear eye protection and fuel-resistant gloves; fuel can spray when lines are opened.
• ⚠️ Disconnect the battery negative cable before opening the tank access.
• ⚠️ Keep a class B fire extinguisher nearby if possible.
• ⚠️ Clean around the pump opening first; dirt in the tank can damage the new pump.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 3/8" drive ratchet
• 3" extension for 3/8" ratchet
• Phillips #2 screwdriver
• Trim clip removal tool
• Needle-nose pliers
• Fuel line disconnect tool set (specialty)
• Brass drift punch (specialty)
• Small hammer
• Torque wrench (5–30 Nm range)
• Plastic scraper
• Shop towels
• Catch pan
• Permanent marker
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• In-tank fuel pump module assembly - Qty: 1
• Fuel pump tank seal / O-ring - Qty: 1
• Fuel line quick-connect O-rings (if applicable) - Qty: 1 set

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📋 Before You Begin

• Park on level ground, put the shifter in 1st gear, and set the parking brake.
• Try to do this with the fuel level below 1/2 tank to reduce spills and weight.
• Relieve fuel pressure before disconnecting lines (steps below).
• Have a place ready for fuel-soaked towels and parts; keep everything very clean.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Open the hood.
• Use 10mm socket and ratchet to disconnect the battery negative terminal (black cable) and move it aside.
• Re-connect the negative cable briefly so you can safely “use up” fuel pressure: remove the fuel pump electrical power first (next bullet), then crank.
• Access the fuel pump connector at the pump (you’ll open the access cover in Step 3), unplug it, then attempt to start the engine for 3–5 seconds. It should crank and not start (this releases pressure).
• Use 10mm socket to disconnect the battery negative terminal again.
• Tip: Place towels under any line you open.

Step 2: Remove the rear seat bottom

• Open both doors and move the front seats forward.
• Use the trim clip removal tool to release the rear seat bottom clips (pull up at the front edge of the seat bottom near the clip points).
• Lift the seat bottom out of the car and set it aside.

Step 3: Open the fuel pump access cover

• Locate the service/access cover on the floor under the rear seat area.
• Use a Phillips #2 screwdriver (or 10mm socket if bolts are used) to remove the fasteners.
• Lift the cover off. Use shop towels to wipe/clean loose dust away.
• Use a permanent marker to mark hose/connector positions so they go back the same way.

Step 4: Disconnect the electrical connector and fuel lines

• Unplug the pump electrical connector by hand. Use needle-nose pliers only if a clip is stubborn (don’t break it).
• Place shop towels and a catch pan under the fuel line connection.
• Use the fuel line disconnect tool set (specialty) to release the quick-connect fitting, then pull the line straight off.
• Cap/cover the open line ends with clean towels to keep dirt out.
• Tip: Push the line in first, then release clip.

Step 5: Remove the lock ring (retaining ring)

• Use a plastic scraper and shop towels to clean dirt around the lock ring and pump flange.
• Use a brass drift punch (specialty) and small hammer to tap the lock ring counterclockwise to loosen it.
• Remove the lock ring and set it somewhere clean.
• Tip: Brass reduces spark risk vs steel.

Step 6: Remove the fuel pump module

• Lift the pump/module up slowly. Angle it as needed to clear the fuel level float arm.
• Let fuel drain from the module into the tank for a few seconds, then lift it out.
• Place the module into the catch pan.
• Remove the old tank seal/O-ring from the tank opening using a plastic scraper.

Step 7: Install the new seal and new pump/module

• Install the new fuel pump tank seal / O-ring onto the tank opening (make sure it sits flat and isn’t twisted).
• Carefully lower the new pump/module into the tank, guiding the float arm in without bending it.
• Align the module to your marks so the ports and connector face the correct direction.

Step 8: Reinstall and tighten the lock ring

• Reinstall the lock ring by hand first to avoid cross-threading/misalignment.
• Use the brass drift punch (specialty) and small hammer to tap the ring clockwise until fully seated at its stops.
• Torque to 90 Nm (66 ft-lbs) if you are using a proper lock-ring tool with a torque wrench; otherwise seat it firmly to the factory stops.

Step 9: Reconnect fuel lines and connector

• Reconnect the fuel line quick-connect until you feel/hear it click.
• Gently tug the line by hand to confirm it’s locked.
• Plug in the electrical connector until it clicks.

Step 10: Prime the system and check for leaks

• Use the 10mm socket and ratchet to reconnect the battery negative terminal.
• Turn the key to ON (do not start) for 5 seconds, then OFF. Repeat 3 times to prime the pump.
• With the access cover still off, inspect closely for any fuel seepage at the line and pump seal area.

Step 11: Reinstall the access cover and rear seat

• Reinstall the access cover and fasteners using a Phillips #2 screwdriver or 10mm socket (whichever your car uses).
• Reinstall the rear seat bottom and push down firmly to re-engage the clips.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes while you sniff/check for fuel odor and verify no leaks.
• Take a short test drive, then re-check for fuel smell in the cabin (a pinched seal can cause odor).
• If the engine cranks but won’t start, repeat the key ON/OFF prime cycle 3–5 more times.

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💰 DIY vs Shop Cost

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

DIY Cost: $250-$800 (parts only)

You Save: $400-$600 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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