This procedure replaces the fuel pump assembly on a 2015 Kia Forte 1.8L by accessing it through the rear seat area, requiring fuel system depressurization and tank lowering or access panel removal.

Warnings

Tools required

Parts

• Fuel pump assembly × 1 — Use OEM specification (31110-1M100 or equivalent)
• Fuel pump O-ring seal × 1 — Usually included with pump assembly
• Fuel line quick-connect seals (if damaged) × 1 — Inspect before ordering

Preparation

1. Park vehicle on level ground in well-ventilated area away from heat sources, sparks, and open flames
2. Ensure fuel tank is less than 1/2 full; if more than half full, siphon or drain excess fuel into approved container before beginning
3. Turn ignition to OFF position and remove key
4. Disconnect negative battery cable and wait minimum 90 seconds
5. Place fire extinguisher within immediate reach of work area
6. Gather all tools and parts before beginning to minimize time with fuel system open
7. Place absorbent pads or towels under work area to catch fuel spillage

Procedure

1. 1

   Relieve fuel system pressure
   Locate the fuel pump fuse or relay in the engine compartment fuse box (consult owner's manual for exact location, typically fuse #13 or relay in position marked FUEL PUMP). Remove the fuel pump fuse/relay. Reconnect battery temporarily, start the engine and allow it to run until it stalls from fuel starvation (typically 30-60 seconds). Attempt to restart 2-3 times to ensure all pressure is relieved. Turn ignition OFF and disconnect battery negative cable again. Wait 90 seconds before proceeding.
   ⚠️Engine will stall suddenly when fuel pressure is depleted. This is normal and expected.
2. 2

   Access fuel pump through rear seat
   Remove the rear seat cushion by pulling firmly upward on the front edge to disengage the retaining clips (no tools required on 2015 Forte). Lift seat cushion out of vehicle. Locate the fuel pump access cover in the floor pan beneath where the passenger-side rear seat was positioned. You will see a rectangular metal or plastic cover with 4-6 screws.
   ℹ️Some residual fuel odor is normal when accessing the pump area.
3. 3

   Remove fuel pump access cover
   Using a Phillips screwdriver, remove all access cover screws (typically 4-6 screws). Keep screws organized for reinstallation. Carefully lift the access cover straight up to expose the fuel pump assembly. Clean any debris or dirt around the fuel pump opening to prevent contamination from entering the fuel tank.
4. 4

   Disconnect fuel pump electrical connector
   Locate the electrical connector on top of the fuel pump module. Press the release tab and carefully pull the connector straight up to disconnect. Do not pull on wires. If connector is difficult to remove, gently rock side-to-side while pulling upward. Inspect connector and terminals for corrosion or damage.
   ⚠Fuel vapors will be present. Ensure adequate ventilation.
5. 5

   Disconnect fuel supply and return lines
   Identify the fuel supply line (larger diameter) and return/vapor lines connected to the top of the fuel pump assembly. Place shop towels around the connections to catch residual fuel. Using the appropriate size fuel line disconnect tool, depress the release tabs on each quick-connect fitting and pull the lines straight off the pump. Expect approximately 50-100ml of fuel to drain from each line. Cap or plug the disconnected fuel lines to prevent contamination.
   ⚠️Even with pressure relieved, residual fuel will drain from lines. Keep absorbent materials ready and avoid any ignition sources.
6. 6

   Remove fuel pump lock ring
   Using the fuel pump lock ring tool, position the tool's lugs into the corresponding notches on the lock ring. Turn the lock ring counterclockwise (when viewed from above) to loosen. The lock ring may be tight due to corrosion or thread locking compound. Once loosened, remove the lock ring completely and set aside. Note the orientation and position of any alignment marks.
   ⚠Do not use a hammer and punch to loosen the lock ring as this can create sparks near fuel vapors and damage the ring threads.
7. 7

   Remove fuel pump assembly from tank
   Carefully lift the fuel pump assembly straight up and out of the fuel tank opening. The assembly includes the float arm and fuel level sender which extends down into the tank. Tilt the assembly at an angle (typically 30-45 degrees) as you withdraw it to clear the fuel level float and avoid bending components. Fuel will drain from the pump assembly reservoir; hold over drain pan. Once removed, place the old pump assembly in the drain pan.
   ⚠Fuel pump assembly is delicate. Do not bend the fuel level sender arm or drop the assembly as this will cause inaccurate fuel gauge readings.
   ⚠Approximately 200-500ml of fuel will drain from the pump assembly during removal.
8. 8

   Inspect and clean fuel tank opening
   Inspect the fuel tank opening and sealing surface for debris, corrosion, or damage. Use a clean shop towel to wipe the sealing surface completely clean. Check the O-ring groove in the tank for any debris or old O-ring material. Inspect the inside of the tank opening with a flashlight for any foreign material; remove if found. Do NOT allow any debris to fall into the fuel tank.
   ℹ️The fuel tank must be sealed properly to prevent fuel leaks and maintain correct fuel system pressure.
9. 9

   Prepare new fuel pump assembly
   Remove the new fuel pump assembly from packaging. Verify that the new O-ring seal is properly positioned in the groove on the pump assembly flange. Compare the new pump assembly to the old unit to verify correct application (fuel level sender arm length, electrical connector configuration, and overall dimensions should match). Do not lubricate the O-ring; install dry. Check that the fuel inlet strainer/sock on the bottom of the pump assembly is properly attached.
   ℹ️Using an incorrect fuel pump assembly can result in inaccurate fuel gauge readings or fuel starvation.
10. 10

    Install new fuel pump assembly
    Carefully lower the new fuel pump assembly into the fuel tank opening at an angle to clear the fuel level sender float arm. Align any orientation marks or tabs on the pump flange with corresponding marks on the tank. Once the float arm is inside the tank, rotate the assembly to the correct orientation and press the flange straight down onto the tank sealing surface. Ensure the O-ring is not pinched or displaced. The flange should sit flat against the tank with no gaps.
    ⚠Proper orientation is critical. The fuel level sender must align correctly or fuel gauge will read incorrectly.
11. 11

    Install and torque fuel pump lock ring
    Place the lock ring over the fuel pump assembly, aligning the threads with the tank. Using the fuel pump lock ring tool, turn the lock ring clockwise (when viewed from above) until hand-tight. Then use the lock ring tool with a torque wrench to tighten the lock ring to the specified torque of 65 Nm (48 lb-ft). Ensure the lock ring is fully seated and secure.
    ⚠️CRITICAL: Proper torque is essential to prevent fuel leaks and maintain fuel system integrity. Under-torquing can cause leaks; over-torquing can damage the tank or pump threads.
12. 12

    Reconnect fuel lines
    Remove any caps or plugs from the fuel lines. Push each fuel line onto its corresponding quick-connect fitting on top of the fuel pump assembly. Push firmly until you hear and feel a distinct click indicating the connector is fully engaged. Gently tug on each line to verify it is locked in place and will not pull off.
    ⚠️Improperly connected fuel lines will leak under pressure and create a fire hazard. Each line must click and lock positively.
13. 13

    Reconnect electrical connector
    Align the fuel pump electrical connector and press it firmly onto the pump until the locking tab clicks into place. Verify the connection is secure by gently pulling on the connector body (not the wires). The connector should not separate from the pump.
    ℹ️A poor electrical connection will prevent the fuel pump from operating or cause intermittent running issues.
14. 14

    Reinstall access cover
    Position the fuel pump access cover over the opening, ensuring any alignment features are correctly oriented. Install all access cover screws and tighten in a cross-pattern to the specified torque of 4.0 Nm (3.0 lb-ft). Do not overtighten as this can strip the threads or crack the cover.
15. 15

    Prime fuel system and check for leaks
    Reinstall the rear seat cushion by aligning the rear hooks and pressing down firmly on the front edge until the clips engage. Reconnect the negative battery cable. Without starting the engine, turn the ignition key to the ON position (do not crank). The fuel pump will run for approximately 2-3 seconds to pressurize the system. Turn ignition OFF, wait 5 seconds, then repeat this cycle 4-5 times to fully prime the fuel system. Have an assistant observe the access panel area (with cover temporarily removed if possible, or listen carefully) for any signs of fuel leaks. If no leaks are observed, reinstall access cover if removed, then start the engine.
    ⚠️CRITICAL INSPECTION POINT: Any fuel leak must be corrected immediately before operating the vehicle. Shut off engine and relieve pressure if leaks are detected.

Reassembly

1. Ensure rear seat cushion is properly secured with all clips fully engaged
2. Reinstall fuel pump fuse or relay in the engine compartment fuse box
3. Verify battery connections are clean and tight
4. Clear any tools and materials from vehicle interior and engine compartment

Verification

• Turn ignition to ON position (without starting) and listen for fuel pump operation for 2-3 seconds; pump should run smoothly without unusual noise
• Start engine and verify it starts normally without extended cranking (should start within 3-5 seconds)
• Allow engine to idle for 5 minutes and monitor for smooth operation, no fuel odor, and no leaks
• With engine running, remove access cover and inspect fuel pump area with flashlight for any signs of fuel seepage or wetness around lock ring seal
• Check fuel gauge operation; gauge should reflect actual fuel level in tank (may take 30-60 seconds after key-on to update)
• Perform a test drive covering at least 10 miles including various speeds and loads; monitor for proper fuel delivery, no stumbling, and no fuel odor
• After test drive, re-inspect fuel pump access area for any leaks or fuel odor
• If any fuel leaks, unusual noises, or fuel delivery problems are observed, DO NOT operate the vehicle; repeat inspection and repair procedures

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