Fuel Line - High Pressure

This procedure replaces the high-pressure fuel line between the fuel pump and fuel rail on the 1.5L turbocharged engine, which operates at extremely high pressures and requires careful handling to prevent fuel leaks and fire hazards.

Warnings

Tools required

Parts

• High pressure fuel line × 1 — Use OEM Honda part number - see dealer
• Fuel line O-rings × 4 — Multiple sizes - included with fuel line or purchase separately
• Fuel line retainer clips × 2 — OEM Honda - reuse if condition is good

Preparation

1. Ensure engine is completely cold (minimum 2 hours after last operation)
2. Park vehicle on level ground outdoors or in well-ventilated area away from ignition sources
3. Place fire extinguisher within immediate reach of work area
4. Disconnect negative battery terminal and wait 3 minutes for airbag system to discharge
5. Remove engine cover by pulling up firmly on cover to release clips
6. Locate fuel pump fuse (fuse #31, 15A) in under-hood fuse box on driver's side
7. Remove fuel pump fuse to disable fuel pump
8. Attempt to start engine and let it crank until it fails to start (this relieves most fuel pressure)
9. Turn ignition OFF and remove key
10. Place absorbent pads/towels under fuel line routing area beneath intake manifold

Procedure

1. 1

   Relieve residual fuel system pressure
   Even after running the fuel pump dry, residual pressure remains. Locate the fuel rail service port on top of the fuel rail. Place shop towels completely around the service port. Slowly loosen the service port cap to release any remaining pressure. You will hear hissing and may see fuel spray into the towels. Wait until all pressure is released and hissing stops completely before proceeding.
   ⚠️Fuel may spray when loosening service port. Keep face and eyes away. Wear safety glasses.
2. 2

   Remove turbocharger heat shield and brackets
   The high-pressure fuel line runs along the driver's side of the engine near the turbocharger. Remove the turbocharger heat shield bolts and carefully remove the heat shield to access the fuel line routing. Remove any brackets or clips securing the fuel line along its path from the fuel pump to the fuel rail.
   Torque spec

   Bracket Bolts19 Nm (14 lb-ft)
3. 3

   Disconnect high-pressure line at fuel rail
   Locate where the high-pressure fuel line connects to the fuel rail on the intake side. Place shop towels completely around the connection point to capture residual fuel. Using the appropriate fuel line disconnect tool, release the quick-connect fitting by pressing the release tabs while pulling the line straight away from the fuel rail. Do NOT twist or bend the line. Immediately cap the open fuel rail port with a clean plastic cap to prevent contamination.
   ⚠Residual fuel under pressure may spray out. Keep towels tightly around connection and face away from fitting.
   Torque spec

   Fuel Line Fittings25 Nm (18 lb-ft)
4. 4

   Trace and support fuel line routing
   Before disconnecting the pump end, trace the entire high-pressure fuel line routing from fuel rail back to the fuel pump connection point. Note the exact path, any mounting clips, and how the line is routed around other components. Take photos if helpful. The line runs along the driver's side of the block and connects to the high-pressure fuel pump on the rear of the cylinder head.
   ℹ️Incorrect routing during reinstallation can cause line contact with hot exhaust components or moving parts, leading to line failure and fire.
5. 5

   Disconnect high-pressure line at fuel pump
   Access the high-pressure fuel pump mounted on the rear of the cylinder head (driver's side). Place shop towels around the pump connection point. Using the fuel line disconnect tool, release the quick-connect fitting at the pump outlet. Pull the line straight away from the pump - do not twist. Cap the pump outlet immediately with a clean plastic cap.
   ⚠Additional fuel may drain from the line. Capture all fuel in approved container.
   Torque spec

   Fuel Line Fittings25 Nm (18 lb-ft)
6. 6

   Remove high-pressure fuel line
   Carefully release all mounting clips and brackets holding the fuel line in place. Remove the high-pressure fuel line from the vehicle, being careful not to damage surrounding components or spill residual fuel. Allow any remaining fuel to drain into an approved container. Inspect the mounting points and surrounding area for any fuel contamination or damage.
   ℹ️Do not allow the old fuel line to contact painted surfaces or drop on the ground where fuel could contaminate soil.
7. 7

   Inspect and clean connection points
   Remove the plastic caps from the fuel rail and pump ports. Inspect both ports for debris, damage, or corrosion. The sealing surfaces must be completely clean and free of scratches. Wipe clean with lint-free shop towels. Inspect the quick-connect fittings on both ends - ensure the locking mechanisms are intact and functional. If any damage is found, the fuel rail or pump assembly must be replaced.
   ⚠Any debris or damage at connection points will cause high-pressure fuel leaks. Do not proceed if surfaces are damaged.
8. 8

   Prepare new high-pressure fuel line
   Unpack the new high-pressure fuel line. Verify it matches the old line exactly in length, fitting types, and routing configuration. Install NEW O-rings on both ends of the new fuel line. Lightly lubricate the O-rings with clean engine oil - do NOT use petroleum jelly or other lubricants. Ensure O-rings are seated properly in their grooves with no twists or damage.
   ⚠️NEVER reuse old O-rings. Reused O-rings will fail under high pressure and cause catastrophic fuel leaks and fire risk.
9. 9

   Install fuel line at pump connection
   Starting at the high-pressure fuel pump, align the new fuel line with the pump outlet port. Ensure the O-ring is properly positioned. Push the quick-connect fitting straight onto the pump port until you hear and feel a distinct click. Pull back on the line firmly to verify it is locked - it should not come off. Do not twist during installation.
   ⚠The connection must click and lock. If it does not lock properly, remove, inspect O-ring and fitting, and try again.
   Torque spec

   Fuel Line Fittings25 Nm (18 lb-ft)
10. 10

    Route fuel line and install mounting clips
    Carefully route the new fuel line along the exact same path as the original, following your notes and photos from step 4. Ensure the line does not contact the exhaust manifold, turbocharger, or any moving parts. Install all mounting clips and brackets to secure the line in place. The line must be supported along its entire length with no unsupported spans that could vibrate.
    ⚠️Incorrect routing that allows fuel line contact with exhaust components will melt the line and cause fuel spray onto hot exhaust, resulting in fire.
    Torque spec

    Bracket Bolts19 Nm (14 lb-ft)
11. 11

    Connect fuel line at fuel rail
    At the fuel rail end, verify the O-ring is properly lubricated and seated. Align the quick-connect fitting with the fuel rail port and push straight on until you hear and feel a distinct click. Pull back firmly on the line to verify it is locked securely. The connection should not come apart with firm pulling force.
    ⚠Both ends must be securely locked. A loose connection will spray fuel at 3,600+ PSI when the pump activates.
    Torque spec

    Fuel Line Fittings25 Nm (18 lb-ft)
12. 12

    Reinstall heat shields and covers
    Reinstall the turbocharger heat shield and secure with bolts to specified torque. Ensure no wires, hoses, or the fuel line itself are pinched between the heat shield and other components. Verify the fuel line has proper clearance from all hot surfaces even when the engine is running and components expand.
    Torque spec

    Bracket Bolts19 Nm (14 lb-ft)
13. 13

    Perform initial pressure test
    Reinstall the fuel pump fuse. With ignition still OFF and battery still disconnected, reconnect the negative battery terminal. Turn ignition to ON position (do not start engine). The fuel pump will run for 2 seconds, pressurizing the system. Immediately inspect all connections for fuel leaks using a flashlight. Look for wetness, drips, or fuel odor. Cycle ignition OFF and ON three times, checking for leaks after each cycle.
    ⚠️If ANY fuel leak is detected, immediately turn ignition OFF, relieve fuel pressure, and correct the problem. Do not attempt to start the engine with any fuel leak present.
14. 14

    Start engine and perform running pressure test
    If no leaks were found during initial pressure test, start the engine. Immediately check all fuel line connections while engine is running. The system reaches maximum pressure during operation. Check for leaks, fuel odor, or any wetness. Let engine idle for 5 minutes while monitoring connections. If any leak is detected, immediately shut off engine and address the leak.
    ⚠️Maximum fuel pressure occurs when engine is running. Any leak will spray fuel at extremely high velocity. Keep fire extinguisher ready and evacuate area immediately if leak is detected.

Reassembly

1. Reinstall engine cover by aligning clips and pressing down firmly until all clips engage
2. Double-check that all tools have been removed from engine bay
3. Verify no shop towels or other materials were left in engine compartment
4. Check ground around vehicle for any fuel spills and clean if necessary with absorbent material

Verification

• With engine running, verify no fuel odor is present in engine bay or cabin
• Check all fuel line connection points visually for any wetness or drips
• Rev engine to 3,000 RPM briefly and recheck all connections - fuel pressure increases with RPM
• After 10 minutes of operation, shut off engine and inspect connection points again while system is still pressurized
• Check for proper fuel pressure using scan tool if available (should be 3,600-4,350 kPa / 520-630 PSI at idle)
• Test drive vehicle and monitor for any fuel odor, rough running, or fuel pressure-related codes
• After test drive, perform final visual inspection of all connection points for leaks

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

Chasing one of these codes and not sure which part is guilty? Ask a master mechanic about YOUR car →

More procedures for this vehicle