🔧 CX-9 - Fuel Pump Replacement

The fuel pump on your CX-9 is an in-tank pump module that supplies high-pressure fuel to the engine. Replacement typically involves relieving fuel pressure, accessing the pump through the interior service opening, swapping the module, and then verifying there are no leaks.

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

Assumption: Your CX-9 has an interior access panel above the fuel tank (no tank removal).

---

⚠️ Safety & Precautions

• 🧯 Work in a well-ventilated area; fuel vapors are flammable.
• 🔥 No smoking, no hot work lights, no sparks near the vehicle.
• 🧤 Wear gloves and safety glasses; fuel can irritate skin and eyes.
• 🔋 Disconnect the negative battery cable before opening the fuel system.
• ⛔ Relieve fuel pressure before disconnecting any fuel line to prevent spray.
• 🧼 Clean the area before opening the tank to keep dirt out.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Fire extinguisher (Class B)
• 10mm socket
• 12mm socket
• 1/4" drive ratchet
• 3/8" drive ratchet
• 3" extension
• Torque wrench (5-60 N·m range)
• Trim removal tool set
• Flat-blade screwdriver (small)
• Picks set
• Needle-nose pliers
• Fuel line disconnect tool set
• Brass drift punch (specialty)
• Small hammer
• Shop towels
• Catch pan (fuel-safe)
• Flashlight (non-incandescent)
• Paint marker
• OBD2 scan tool

---

🔩 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
• Fuel pump lock ring (if required) - Qty: 1
• Dielectric grease (small packet) - Qty: 1

---

📋 Before You Begin

• 🅿️ Park on level ground and set the parking brake.
• ⛽ Try to work with the tank below 1/2 full to reduce spills.
• 🔋 Open the hood and get access to the battery for disconnect.
• 🧼 Vacuum and wipe the rear seat/cargo area so no dirt falls into the tank opening.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve fuel pressure

• Use the OBD2 scan tool to check for stored fuel system codes and save them.
• Turn ignition OFF.
• Open the under-hood fuse/relay box (use a trim removal tool set if clips are tight).
• Remove the fuel pump fuse/relay (use needle-nose pliers carefully).
• Start the engine and let it run until it stalls.
• Crank the engine for 3-5 seconds one more time, then turn ignition OFF.
• This reduces spray when lines are opened.

Step 2: Disconnect the battery

• Use a 10mm socket to disconnect the negative battery terminal and isolate it so it can’t spring back.

Step 3: Access the fuel pump service opening

• Move to the rear passenger area/cargo area and remove the rear seat bottom or access cover area (use a trim removal tool set).
• Remove any bolts holding brackets/covers using a 10mm socket or 12mm socket.
• Lift the service cover to expose the top of the fuel pump module.

Step 4: Clean and mark everything

• Use shop towels to wipe dirt away from the module top and the surrounding metal.
• Use a paint marker to mark the pump module orientation relative to the tank (helps install the new one correctly).

Step 5: Disconnect electrical connector and fuel lines

• Unplug the pump electrical connector. Use a pick set or small flat-blade screwdriver to gently lift the lock tab (don’t break it).
• Place a catch pan (fuel-safe) and shop towels under the lines.
• Disconnect the quick-connect fuel line(s) using a fuel line disconnect tool set if needed.
• Expect a small amount of fuel to drip.

Step 6: Remove the lock ring / retaining ring

• If equipped with a lock ring, tap it counterclockwise using a brass drift punch (specialty) and small hammer.
• Remove the ring and set it aside (replace it if your new pump kit includes one).
• Brass helps reduce spark risk.

Step 7: Remove the fuel pump module

• Carefully lift the module straight up. Angle it as needed to clear the float arm.
• Let fuel drain from the module into the tank opening briefly, then move it to the catch pan (fuel-safe).
• Remove the old seal/O-ring from the tank opening using a pick set.

Step 8: Install the new seal and new pump module

• Install the new fuel pump module seal/O-ring into the tank groove (make sure it sits flat).
• Apply a tiny amount of dielectric grease to the electrical connector seal (do not coat the terminals).
• Lower the new module into the tank, aligning it to your paint marker marks.

Step 9: Reinstall the lock ring / retaining ring

• Install the lock ring and tighten it by tapping clockwise using the brass drift punch (specialty) and small hammer until fully seated.
• If your setup uses retaining bolts instead of a ring, install and tighten evenly using a 10mm socket, then Torque to the factory specification with a torque wrench (5-60 N·m range).

Step 10: Reconnect fuel lines and electrical connector

• Reconnect fuel line(s) until you hear/feel a solid click.
• Gently tug-test the line by hand to confirm it is locked.
• Reconnect the electrical connector until it clicks.

Step 11: Reinstall service cover and interior trim

• Reinstall the service cover and any brackets using a 10mm socket or 12mm socket.
• Reinstall the seat cushion/trim using the trim removal tool set.

Step 12: Restore power and prime the system

• Reinstall the fuel pump fuse/relay you removed.
• Reconnect the negative battery terminal using a 10mm socket.
• Turn ignition ON (do not start) for 10 seconds, then OFF for 10 seconds. Repeat 3 times to prime the system.

---

✅ After Repair

• 🕵️ With ignition ON, inspect the pump top and fuel line connection for any wetness or fuel smell.
• 🚗 Start the engine and let it idle for 2-3 minutes while checking again for leaks.
• 🧰 Use the OBD2 scan tool to clear any codes and verify none return.
• 🛣️ Take a short test drive, then re-check for leaks once more.

---

💰 DIY vs Shop Cost

Shop Cost: $900-$1,500 (parts + labor)

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

You Save: $650-$850 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-4 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.