fuel

Fuel Cap

for 2021 Honda Accord 1.5L I4 Turbo · FWD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Mechanic · 20+ years

Difficulty

Easy

Time

6 min

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

This procedure covers the replacement of the fuel cap on a 2018-2024 Honda Accord with 1.5L turbo engine, a simple maintenance task requiring no tools.

Warnings

⚠Ensure the fuel filler door is fully open and supported before attempting to remove the fuel cap

ℹ️A damaged or improperly sealing fuel cap can trigger the check engine light (EVAP system codes P0455, P0456, or P0457)

Parts

Fuel cap × 1 — Use OEM Honda fuel cap or equivalent

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Preparation

Park vehicle on level ground and turn off the engine
Allow the fuel system to cool if the vehicle has been recently driven
Locate the fuel filler door release lever inside the vehicle (left side of driver's footwell) and pull to open

Procedure

1
Release fuel system pressure
Turn the existing fuel cap counterclockwise slowly until you hear a hissing sound, then pause. This releases any pressure or vacuum in the fuel tank. Wait until the hissing stops completely before proceeding.
⚠Do not remove cap completely until all pressure is released to avoid fuel spray
2
Remove old fuel cap
Continue turning the fuel cap counterclockwise until it is free from the fuel filler neck threads. Remove the cap and tether completely. Inspect the fuel filler neck opening for debris or damage.
3
Inspect fuel cap tether
Check if the fuel cap is attached via a tether to the fuel filler door. If the tether is integrated with the cap, note the connection point. Some models have a quick-release tether connection that must be disconnected before removing the old cap completely.
4
Install new fuel cap
If equipped with a tether, connect the new fuel cap tether to the fuel filler door mounting point. Align the new fuel cap threads with the fuel filler neck and turn clockwise by hand. Continue turning until you hear at least three distinct clicks, indicating proper sealing.
5
Verify proper installation
Ensure the fuel cap is fully seated and does not turn freely. The cap should be snug and the seal should be compressed against the filler neck. Close the fuel filler door and verify it latches properly.

Reassembly

No disassembly is required for this procedure

Verification

Start the engine and verify no fuel odor is present around the fuel filler area
If the check engine light was on due to fuel cap issues, it may take several drive cycles (20-40 miles) for the light to clear automatically, or use an OBD-II scanner to clear codes immediately
Perform a visual inspection to confirm the fuel filler door closes flush with the body panel

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