This procedure removes and replaces the fuel pump assembly on a 2016-2024 Hyundai Tucson 2.5L AWD by accessing the pump through the rear seat area, requiring fuel system depressurization and careful handling of flammable materials.

Warnings

Tools required

Parts

• Fuel pump module assembly × 1 — Use OEM specification
• Fuel pump module O-ring seal × 1 — Usually included with pump assembly
• Access cover screws (if damaged) × 6 — M6 screws

Preparation

1. Park vehicle on level surface in well-ventilated area away from ignition sources
2. Ensure fuel tank is between 1/4 and 1/2 full (drain if necessary before beginning)
3. Have Class B fire extinguisher within immediate reach
4. Disconnect negative battery cable and wait 3 minutes for airbag system to deplete
5. Remove rear seat cushion by pulling upward firmly on front edge to release clips
6. Remove rear seat back by releasing lower clips and lifting up and out
7. Inspect access cover location in floor pan beneath rear seat - should be centered under seat area

Procedure

1. 1

   Depressurize fuel system
   Locate the fuel pump relay in the engine compartment fuse box (refer to fuse box cover diagram, typically labeled 'FUEL PUMP'). Remove the fuel pump relay. Attempt to start the engine - it should start briefly then stall as fuel pressure drops. Crank engine for additional 5 seconds to ensure complete depressurization. Turn ignition OFF. This step is critical to prevent fuel spray during disconnection.
   ⚠️Skipping this step will result in pressurized fuel spray when lines are disconnected. Fuel system operates at approximately 50-60 PSI.
2. 2

   Remove fuel pump access cover
   Locate the access cover screws securing the metal or plastic cover in the floor pan beneath rear seat. Remove all screws (typically 6 screws) using appropriate driver. Carefully lift access cover to expose fuel pump module. Clean any debris from around the fuel tank opening to prevent contamination.
3. 3

   Disconnect electrical connector
   Locate the electrical connector on top of fuel pump module. Press release tab and pull connector straight up to disconnect. Inspect connector terminals for corrosion or damage. Do not pull on wires - hold connector body only.
   ⚠Connector may be stiff from years of service. Use gentle rocking motion while pulling - do not force or wires may be damaged.
4. 4

   Disconnect fuel supply and return lines
   Identify fuel supply line (larger diameter, typically with black collar) and return/vapor lines. Have shop towels ready to catch residual fuel. Using fuel line disconnect tool, compress the release tabs on quick-connect fittings and pull lines straight off fuel pump module ports. Residual fuel (approximately 50-100ml) will drain - capture in towels. Cap or plug open lines to prevent contamination.
   ⚠️Even after depressurization, residual fuel under slight pressure may spray. Wear safety glasses and have towels positioned to catch fuel.
5. 5

   Remove fuel pump lock ring
   Position fuel pump lock ring tool onto the fuel pump module lock ring (large threaded ring securing pump to tank). The lock ring has notches or tabs - ensure tool engages properly. Turn counterclockwise to loosen. Initial break may require significant force. Once loose, continue turning by hand until lock ring is completely unthreaded. Remove and set aside lock ring. Note the orientation of lock ring for reinstallation.
   ⚠Do not strike the lock ring or use excessive force that could damage the fuel tank threads. If lock ring is seized, apply penetrating oil and wait 15 minutes before attempting again.
   ⚠️Do not use impact tools or create sparks. Use only hand tools rated for use in flammable environments.
   Torque spec

   Fuel Pump Module Lock Ring80 Nm (59 lb-ft)
6. 6

   Remove fuel pump module assembly
   Carefully lift fuel pump module straight up and out of fuel tank opening. The pump assembly has a float arm and fuel level sender that extend downward - angle the assembly approximately 30 degrees as you lift to clear the tank opening without bending components. Fuel will drain from pump assembly - have towels and catch container ready. Once clear of tank, place pump assembly on clean towels. Inspect inside tank opening for debris or contamination.
   ⚠Pump assembly is delicate. Do not allow float arm or fuel level sender to strike tank edges during removal. Bending these components will cause inaccurate fuel gauge readings.
   ⚠️Expect approximately 200-500ml of fuel to drain from pump assembly. Ensure catch container is positioned correctly.
7. 7

   Inspect and clean tank opening
   Inspect the O-ring seal groove on fuel tank opening for damage, corrosion, or debris. Clean groove with lint-free cloth. Inspect inside tank (using flashlight) for debris, contamination, or rust. If significant debris is present, tank should be professionally cleaned before new pump installation. Check tank threads for damage.
   ℹ️This is the only opportunity to inspect fuel tank interior. Dark discoloration is normal, but rust flakes, sludge, or water indicates contamination requiring professional fuel system service.
8. 8

   Prepare new fuel pump assembly
   Remove new fuel pump module from packaging. Verify new O-ring seal is properly seated in groove on pump module flange. If O-ring is separate, install it now ensuring it seats completely in groove without twists. Lightly lubricate O-ring with clean gasoline or petroleum jelly to aid installation. Compare new pump assembly to old unit to verify correct replacement part including float arm length and electrical connector configuration.
   ⚠Do not use silicone-based lubricants on O-ring as they are incompatible with gasoline and will cause seal failure.
9. 9

   Install new fuel pump module
   Orient new fuel pump module with alignment marks or tabs matching tank opening. Carefully lower pump assembly into tank at approximately 30-degree angle to clear float arm and level sender. Once components are inside tank, rotate pump to vertical position and press down firmly to compress O-ring seal. Ensure pump module flange seats completely flush against tank - there should be no gaps. Rotate pump slightly if needed to align lock ring threads.
   ⚠Pump must be fully seated before installing lock ring. Attempting to pull pump down with lock ring will damage O-ring seal and cause fuel leak.
10. 10

    Install and torque lock ring
    Thread fuel pump module lock ring onto tank opening by hand, turning clockwise. Ensure lock ring threads engage smoothly without cross-threading. Hand-tighten until snug. Install fuel pump lock ring tool and torque to specification in a smooth, continuous motion. Do not exceed specified torque as this can damage plastic tank threads or crack pump module flange.
    ⚠️CRITICAL TORQUE SPECIFICATION: Under-torquing will cause fuel leak and potential fire. Over-torquing will crack components and cause fuel leak. Use calibrated torque wrench and verify setting before applying.
    Torque spec

    Fuel Pump Module Lock Ring80 Nm (59 lb-ft)
11. 11

    Reconnect fuel lines
    Remove caps or plugs from fuel lines. Inspect quick-connect fittings for damage or debris. Push fuel supply line onto corresponding port on fuel pump module until you hear and feel a distinct click. Tug on line to verify secure connection - it should not pull off. Repeat for return/vapor lines if equipped. Verify all lines are connected to correct ports per factory routing.
    ⚠Quick-connect fittings must click audibly when properly seated. Incorrect connection will cause fuel leak and potential fire during operation.
12. 12

    Reconnect electrical connector
    Align electrical connector with fuel pump module connector ensuring proper orientation. Push connector straight down until release tab clicks into locked position. Tug gently on connector to verify it is secured - it should not pull off.
    ℹ️Connector will only fit in correct orientation. Do not force - verify alignment if connector does not seat easily.
13. 13

    Install access cover
    Position access cover over fuel pump module and align with screw holes. Install all screws and tighten in star pattern to specified torque to ensure even sealing. Verify cover is flush with floor pan.
14. 14

    Reinstall rear seat and restore power
    Reinstall rear seat back by inserting upper hooks and rotating down until lower clips engage. Reinstall rear seat cushion by aligning clips and pressing firmly until all clips engage. Reconnect negative battery cable. Reinstall fuel pump relay in fuse box. Turn ignition to ON position (do not start) and listen for fuel pump priming cycle (2-3 second hum from rear of vehicle). Cycle ignition OFF then ON two more times to fully pressurize fuel system.

Reassembly

1. Verify rear seat is properly secured with all clips engaged before operation
2. Ensure no tools or parts are left in rear seat area or fuel tank access area
3. Dispose of fuel-soaked towels in approved flammable waste container - do not leave in vehicle or enclosed space

Verification

• With vehicle in well-ventilated area, inspect fuel pump access area for fuel odor indicating leak at O-ring seal or fittings
• Start engine and verify it starts normally and runs smoothly without hesitation or stumbling
• With engine running, inspect underneath vehicle for fuel drips or leaks - use flashlight to inspect fuel lines and tank area
• Verify fuel gauge operates correctly and displays appropriate level for known fuel quantity in tank
• Test drive vehicle briefly and verify normal acceleration and no fuel odor in cabin
• After test drive, perform final leak inspection of access area and fuel tank area with engine off
• If any fuel odor is detected at any time, immediately shut off engine, disconnect battery, and investigate source before further operation

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