🔧 Altima - Fuel Pump Module Replacement

On your Altima, the fuel pump is part of an in-tank “fuel pump module” (pump + level sensor + housing). Replacement is done from inside the car through the access cover under the rear seat, then swapping the module and seal to restore correct fuel pressure and reliable starting.

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 flammable.
• ⚠️ No smoking, no heaters, no grinding, and keep sparks/flames away.
• ⚠️ Relieve fuel pressure before disconnecting lines to prevent fuel spray.
• ⚠️ Disconnect the negative battery cable to reduce spark risk.
• ⚠️ Clean around the pump opening; dirt in the tank can damage the new pump.
• ⚠️ Use only a brass drift/punch if tapping the lock ring; steel-on-steel can spark.

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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
• 3/8" drive ratchet
• 3" extension (3/8" drive)
• Plastic trim removal tool
• Phillips #2 screwdriver
• Small flat-blade screwdriver
• Pick tool
• Needle-nose pliers
• Torque wrench (Nm/ft-lb capable)
• Fuel pump lock ring wrench (specialty)
• Brass drift/punch
• Small hammer
• Shop towels
• Drain pan
• Shop vacuum
• 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 tank seal/O-ring - Qty: 1
• Fuel pump lock ring (recommended) - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and open a window for ventilation.
• Have as little fuel in the tank as practical; a lighter tank reduces spill risk.
• Relieve fuel pressure: remove fuel pump power and run the engine until it stalls. (The under-hood fuse/relay box is the IPDM—that’s Nissan’s main power/fuse module.)
• Disconnect the negative battery cable using a 10mm socket.
• Take photos as you go.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Open the hood and locate the under-hood fuse/relay box (IPDM).
• Remove the fuel pump fuse/relay using needle-nose pliers.
• Start the engine and let it run until it stalls. Crank for 2–3 seconds once more to release any remaining pressure.
• Turn ignition OFF.

Step 2: Disconnect the battery

• Use a 10mm socket and 3/8" ratchet to remove the negative battery terminal and position it so it cannot touch the post.

Step 3: Remove the rear seat cushion

• At the front edge of the rear seat bottom, release the retaining clips by pulling up firmly (use a plastic trim removal tool if needed).
• Lift the cushion out and set it aside.
• Pull straight up; the clips are tight.

Step 4: Remove the fuel pump access cover

• Locate the metal access cover in the floor under the seat.
• Use a Phillips #2 screwdriver to remove the screws, then lift the cover.
• Use a shop vacuum to vacuum loose dirt around the top of the pump module.

Step 5: Disconnect the electrical connector and fuel line

• Unplug the pump electrical connector using a small flat-blade screwdriver to release the lock tab.
• Place shop towels and a drain pan under the line connection.
• Disconnect the fuel line quick-connect. Use a pick tool gently if the tabs are stuck (do not break them).
• Wrap the joint with a towel to catch spray.

Step 6: Mark alignment and remove the lock ring

• Use a marker pen to mark the position of the lock ring and module relative to the tank opening.
• Remove the lock ring using a fuel pump lock ring wrench (specialty).
• If you must tap it loose, use a brass drift/punch and small hammer to rotate the ring counterclockwise in small taps.
• Brass is softer to reduce spark risk.

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 arm).
• Let fuel drain from the module into the tank, then move it to the drain pan.
• Remove the old tank seal/O-ring from the tank opening using a pick tool.

Step 8: Install the new seal and module

• Install the new tank seal/O-ring into the groove on the tank opening. Make sure it sits flat and is not twisted.
• Lower the new module into the tank, guiding the float arm in carefully.
• Align the module using your paint marks.

Step 9: Reinstall and tighten the lock ring

• Install the lock ring and tighten it using the fuel pump lock ring wrench (specialty).
• Torque: If your lock ring wrench supports torque, Torque to 65 Nm (48 ft-lbs). If not, tighten until fully seated and aligned with your marks (no gaps, ring fully locked).

Step 10: Reconnect the fuel line and electrical connector

• Reconnect the fuel line quick-connect until it clicks. Pull back lightly to confirm it is locked.
• Reconnect the electrical connector until it clicks.

Step 11: Reinstall the access cover and rear seat

• Reinstall the access cover and screws using a Phillips #2 screwdriver.
• Reinstall the rear seat cushion: line up the hooks, then push down firmly to snap the front clips back in.

Step 12: Restore power and prime the system

• Reinstall the fuel pump fuse/relay in the IPDM (use needle-nose pliers if needed).
• Reconnect the negative battery terminal using a 10mm socket. Torque to 5 Nm (44 in-lbs) (snug, do not over-tighten).
• Turn ignition ON (do not start) for 5 seconds, then OFF for 5 seconds. Repeat 3 times to prime the fuel system.

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✅ After Repair

• Start the engine and let it idle for 2–3 minutes.
• Check for fuel leaks at the pump top and fuel line connection (smell + visual check).
• If you have a check engine light, scan for codes; a loose connector or line can set EVAP/fuel pressure-related codes.
• Test drive 10–15 minutes, then re-check for any fuel smell inside the cabin.

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💰 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 2-3 hours.

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🎯 Ready to get started?

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