🔧 NX200t - Fuel Pump Replacement

On your NX200t, the fuel pump is an in-tank electric pump that supplies high-pressure fuel to the engine. Replacement usually involves removing the rear seat cushion, opening the service access panel, then swapping the pump module and seal.

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

Assumption: pump is accessed under rear seat via service cover.

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⚠️ Safety & Precautions

• Work outside or in a very well-ventilated area; fuel vapors are highly flammable.
• No smoking, no open flames, no incandescent work lights; use an LED work light.
• Relieve fuel pressure before opening any fuel line to reduce spray risk.
• Disconnect the negative battery terminal to prevent sparks.
• Keep a Class B fire extinguisher nearby and clean spills immediately.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• LED work light
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Trim removal tool set
• 10mm socket
• 3/8" drive ratchet
• 3" extension (3/8" drive)
• Phillips screwdriver #2
• Small flat-blade screwdriver
• Pick tool
• Torque wrench (in-lb)
• Torque wrench (ft-lb)
• Fuel line disconnect tool set (specialty)
• Fuel-safe drain pan
• Shop towels
• Marker or paint pen
• Brass drift punch (specialty)
• Small hammer

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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 retaining lock ring - Qty: 1
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Lower the fuel level if possible (under 1/4 tank makes the job cleaner and reduces vapor).
• Relieve fuel pressure: remove the fuel pump fuse/relay (commonly labeled F/P or similar), then start the engine and let it run until it stalls; crank 2-3 more seconds to bleed remaining pressure.
• Disconnect battery: use a 10mm socket to remove the negative battery cable and isolate it so it cannot spring back.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the rear seat cushion

• Use a trim removal tool set to gently pop up the rear seat cushion release points (typically near the front edge of the cushion).
• Lift the cushion out and set it aside.
• Pull straight up to avoid breaking clips.

Step 2: Open the fuel pump service access cover

• Locate the service cover in the floor under the seat area.
• Use a Phillips screwdriver #2 or 10mm socket (varies by cover) to remove the fasteners.
• Lift the cover off, then use shop towels to clean dust/dirt around the pump flange so nothing falls into the tank.

Step 3: Disconnect the electrical connector and fuel lines

• Unplug the fuel pump connector by pressing the tab; use a small flat-blade screwdriver only if needed to gently release the lock.
• Place a fuel-safe drain pan and shop towels under the lines.
• Disconnect the fuel line quick-connect:
  • Use a pick tool to remove the safety clip (if equipped).
  • Use the fuel line disconnect tool set (specialty) if the connector requires it, then pull the line off.
• Wrap the fitting with a towel before separating.

Step 4: Mark orientation and remove the retaining ring/fasteners

• Use a marker or paint pen to mark the pump module position relative to the tank (helps alignment during install).
• If your NX uses a lock ring:
  • Use a brass drift punch (specialty) and small hammer to tap the ring counterclockwise until it releases.
• If your NX uses small bolts/nuts:
  • Use a 10mm socket and 3/8" drive ratchet to remove them in a crisscross pattern.

Step 5: Remove the fuel pump module

• Carefully lift the module straight up; angle it as needed to clear the float arm (fuel level sender).
• Let fuel drain from the module into the tank for a few seconds, then set the module into the fuel-safe drain pan.
• Remove the old tank seal/O-ring from the tank opening using a pick tool (do not scratch sealing surfaces).

Step 6: Install the new seal and fuel pump module

• Lightly coat the new seal with dielectric grease (a thin film) to help it seat without twisting.
• Install the new seal into the tank groove evenly.
• Lower the new pump module into the tank, keeping the float arm from bending, and align to your paint marks.

Step 7: Reinstall and tighten the retaining ring/fasteners

• If your NX uses a lock ring:
  • Install the ring and tap it clockwise using the brass drift punch (specialty) and small hammer until fully seated at the stops/marks.
• If your NX uses bolts/nuts:
  • Snug all fasteners by hand first using a 10mm socket.
  • Tighten in a crisscross pattern with an in-lb torque wrench: Torque to 44 in-lb (5 N·m).

Step 8: Reconnect fuel line(s) and electrical connector

• Push the fuel line on until it clicks; reinstall the safety clip using a pick tool if equipped.
• Reconnect the electrical connector until it locks.
• Wipe everything dry with shop towels so leaks are easy to spot later.

Step 9: Reinstall the service cover and rear seat cushion

• Reinstall the service cover fasteners using a Phillips screwdriver #2 or 10mm socket.
• If the cover uses small bolts, tighten with an in-lb torque wrench: Torque to 44 in-lb (5 N·m).
• Reinstall the rear seat cushion by aligning hooks/clips, then press down firmly until it clicks in.

Step 10: Restore power and prime the fuel system

• Reconnect the negative battery terminal using a 10mm socket.
• Reinstall the fuel pump fuse/relay using your hands or a pick tool if needed.
• Prime: turn ignition to ON (engine off) for 5 seconds, then OFF for 5 seconds; repeat 3 times to build pressure.

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✅ After Repair

• Start the engine and let it idle for 2-3 minutes.
• Check for leaks at the fuel line connection and around the pump flange (use a bright LED work light).
• If you have a check engine light after the repair, scan for codes; a loose connector or not-fully-seated line can trigger EVAP/fuel pressure codes.
• Test drive 10-15 minutes, then recheck for any fuel smell or dampness under the seat access area.

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💰 DIY vs Shop Cost

Shop Cost: $800-$1,400 (parts + labor)

DIY Cost: $300-$800 (parts only)

You Save: $500-$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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