Fuel Pump

This procedure replaces the fuel pump module in a 2016-2021 Honda Civic 1.5L Turbo by accessing it through the rear seat access panel, avoiding the need to drop the fuel tank.

Warnings

Tools required

Parts

• Fuel pump module assembly × 1 — 17045-TBA-A00 or equivalent OEM
• Fuel pump module O-ring seal × 1 — Use OEM specification
• Access cover gasket/seal × 1 — Use OEM specification if damaged

Preparation

1. Park vehicle on level ground outdoors or in well-ventilated area. Engage parking brake and place transmission in Park
2. Ensure fuel tank is less than half full. If necessary, siphon or drain fuel to safe level using approved fuel transfer equipment
3. Position Class B fire extinguisher within immediate reach of work area
4. Open all vehicle doors and windows to maximize ventilation
5. Allow engine to cool completely if recently operated (minimum 1 hour)
6. Disconnect negative battery terminal and wait minimum 3 minutes for system de-energization
7. Place absorbent pads or fuel-safe drain pan under rear of vehicle to catch any fuel spillage

Procedure

1. 1

   Relieve fuel system pressure
   With battery already disconnected, locate the fuel pump relay in the under-hood fuse box (relay position PGM-FI MAIN 1). Remove this relay. Reconnect battery temporarily, then start the engine and let it run until it stalls from fuel starvation. Attempt to restart 2-3 times to ensure all pressure is relieved. Turn ignition OFF and disconnect battery again. This step is CRITICAL - do not skip or rush.
   ⚠️Engine will stall and may run roughly during pressure relief. This is normal. Do not attempt to add throttle or keep it running.
2. 2

   Remove rear seat cushion
   From inside rear cabin, locate the two release clips at the front edge of the rear seat cushion bottom. Pull firmly upward on the front edge of the seat cushion to disengage the clips. Lift the seat cushion up and forward to remove it from the vehicle. Set aside in a clean area.
3. 3

   Remove fuel pump access cover
   Locate the rectangular access cover in the floor pan beneath where the rear seat cushion was located (driver's side of center). Remove the Phillips screws securing the access cover (typically 4 screws). Carefully lift the cover and gasket away. Inspect the gasket for damage and replace if torn or compressed.
4. 4

   Disconnect electrical connector
   Locate the fuel pump module electrical connector at the top of the fuel pump assembly. Press the release tab on the connector and pull straight up to disconnect. Do not pull on wires. Clean any debris from the area around the fuel pump module using compressed air if available.
   ⚠Do not use compressed air if fuel vapors are present - use only dry shop rags to clean debris.
5. 5

   Disconnect fuel feed line
   Locate the fuel feed line quick-connect fitting on top of the fuel pump module. Place shop rags around the connection to catch residual fuel. Using the appropriate size quick-disconnect tool, press the tool into the connector while pulling the fuel line straight up. Fuel will drain from the line - catch with rags or drain pan. Cover the open line with a clean rag to prevent contamination.
   ⚠Expect 1-4 ounces of fuel to spill from the disconnected line even after pressure relief. Have absorbent materials ready.
6. 6

   Disconnect fuel return/vent lines
   Identify the secondary fuel lines (return and vent) connected to the fuel pump module. Using quick-disconnect tools as needed, carefully disconnect each line following the same procedure as the feed line. Mark or photograph line positions if they are not obviously different sizes. Cap or cover all open lines and fittings.
7. 7

   Remove fuel pump lock ring
   Install the fuel pump lock ring tool (Honda tool 07AAA-SOXA100 or equivalent) onto the lock ring tabs. The lock ring turns counterclockwise to loosen. Strike the tool handle sharply with your hand or a rubber mallet to break the lock ring free, then rotate counterclockwise until the lock ring can be lifted off. Remove and set aside the lock ring.
   ⚠Lock ring may be tight due to fuel deposits or corrosion. Do not use excessive force or improvise tools as this can damage the tank threads.
8. 8

   Remove fuel pump module assembly
   Carefully lift the fuel pump module assembly straight up and out of the fuel tank. The module will have fuel in it - tilt it to drain residual fuel back into the tank, then place the assembly in a fuel-safe drain pan. Be careful not to damage the fuel level sender float arm during removal. Once removed, inspect the O-ring seal on the tank opening.
   ⚠The pump assembly is approximately 8-10 inches long. Lift slowly to avoid bending the fuel level sender arm or damaging internal components.
9. 9

   Clean tank opening and inspect
   With the pump removed, use clean shop rags to wipe the tank opening flange and surrounding area. Inspect for debris, rust, or damage. Remove the old O-ring seal from the tank opening groove and clean the groove thoroughly. Check the tank opening for any cracks or damage that would prevent proper sealing.
   ⚠Do not allow any debris to fall into the open fuel tank. Cover opening with clean rag when not actively working on it.
10. 10

    Install new O-ring seal
    Remove the new O-ring seal from its packaging. Lightly lubricate the O-ring with clean gasoline (from the tank or a clean container) - do not use petroleum jelly or other lubricants. Install the O-ring into the groove on the fuel tank opening, ensuring it is seated evenly all the way around with no twists or kinks.
11. 11

    Install new fuel pump module
    Carefully lower the new fuel pump module assembly into the fuel tank opening. Align the module so the orientation matches the original installation (the float arm should point toward the rear of the vehicle). Press down gently to seat the module onto the O-ring. Ensure the module sits flush against the tank opening before proceeding.
    ⚠Verify the fuel level sender float arm has full range of motion and is not contacting the tank walls. Incorrect orientation will cause inaccurate fuel gauge readings.
12. 12

    Install and torque lock ring
    Place the lock ring onto the fuel pump module threads. Hand-thread the lock ring clockwise until it contacts the flange - do not cross-thread. Install the lock ring tool and use a torque wrench to tighten the lock ring to exactly 65.0 Nm (48 lb-ft) in a clockwise direction. Verify the lock ring is fully seated and the module does not rotate.
    ⚠️CRITICAL: This torque specification is essential for fuel system safety. Under-torquing will cause fuel leaks and fire risk. Over-torquing can crack the tank or strip threads. Use a calibrated torque wrench.
13. 13

    Reconnect fuel lines
    Reconnect the fuel feed line to the pump module by pushing the quick-connect fitting straight down onto the pump fitting until you hear and feel a positive click. Tug gently on the line to verify it is locked. Reconnect the return and vent lines in the same manner, ensuring each line is on the correct fitting. Verify all connections are secure.
14. 14

    Reconnect electrical connector and test
    Reconnect the fuel pump electrical connector to the pump module - push down until it clicks into place. Reconnect the negative battery terminal. Turn the ignition to ON position (do not start engine) and listen for the fuel pump to run for 2-3 seconds, then stop. Cycle the ignition OFF and ON three times. Inspect all fuel connections for leaks during and after pump priming cycles.
    ⚠️If any fuel leaks are observed, immediately turn ignition OFF, disconnect battery, and repair the leak before proceeding. Do not attempt to start the engine with active fuel leaks.
15. 15

    Reinstall access cover and rear seat
    Once leak check is complete and satisfactory, position the access cover gasket (new if original was damaged) onto the floor pan. Install the access cover and secure with the Phillips screws, torquing to 4.0 Nm (3.0 lb-ft) in a cross pattern. Reinstall the rear seat cushion by hooking the rear clips first, then pressing down firmly on the front edge until both front clips engage with an audible click.

Reassembly

1. Reinstall fuel pump relay (PGM-FI MAIN 1) in the under-hood fuse box
2. Clear any diagnostic trouble codes using a scan tool if check engine light is illuminated
3. Remove all tools, rags, and drain pans from vehicle and work area
4. Properly dispose of old fuel pump assembly and contaminated rags according to local hazardous waste regulations

Verification

• With battery connected, turn ignition to ON (engine off) and verify fuel pump runs for 2-3 seconds. Repeat 3-4 times
• Start engine and verify it starts normally without extended cranking or rough running
• Check fuel gauge operation - it should display the correct fuel level (may take up to 30 seconds to update)
• With engine running, inspect access cover area and all fuel connections for any signs of leakage
• Test drive vehicle and verify normal acceleration, no fuel smell in cabin, and no check engine light
• After test drive, re-inspect all connections while engine is hot for any seepage or leaks
• Monitor fuel gauge over next several drive cycles to ensure accurate fuel level readings throughout the tank range

More procedures for this vehicle