Parts for your 2008 Honda Elysion-Fuel cap

2008 Honda Elysion Fuel Cap — Purpose, Care and Replacement

Referencing technical sources including the 2008 Honda Elysion Owner’s Manual (JDM), the Honda Electronic Parts Catalogue (EPC) for RR1–RR4 models, and the Honda Service Manual EVAP diagnostics chapter, this vehicle is fitted with a conventional, tethered, screw-type fuel filler cap. It is not a capless system. These sources specify a sealed cap (Honda fuel cap part family 17670-xxx-xxx) to meet evaporative emissions requirements and OBD-II monitoring.

On a 2008 Honda Elysion, the fuel cap isn’t just a lid — it keeps petrol vapours in, dirt and water out, and helps the EVAP system do its job so the car stays efficient and compliant. The cap’s seal and pressure/vacuum valves maintain the tank’s designed pressure range, which supports smooth fueling, reduces odours, and helps prevent Check Engine Lights linked to EVAP small or large leaks (often P0455, P0456 or P0457).

As part of routine servicing, the fuel cap deserves a quick once-over. The rubber seal can harden, flatten or crack with age, the ratchet can wear, and the tether can break. Any of these can let vapour escape, trigger diagnostic codes, or make the cabin or garage smell of petrol. A healthy cap typically tightens until it “clicks” several times — if it won’t click, or it’s hard to start threading, it’s time to look closer.

• At each service, inspect the cap’s seal for nicks, flattening, or glazing.
• Wipe the filler neck and cap sealing area with a clean, dry cloth, avoid oils or grease on the seal.
• If you see cracks, smell persistent fuel odour, or get EVAP leak codes, replace the cap.
• Always tighten until you hear several clicks after refuelling.

Replacement is straightforward and affordable. Choose a genuine Honda or high-quality OEM-equivalent cap with the correct pressure spec for the Elysion’s EVAP system, off-spec caps can still leak or cause false codes. If the fuel door is sticky, sort that too — the Elysion uses an interior release, and forcing the door can stress the tether. As a rule of thumb in Aussie and Kiwi conditions, a proactive replacement every 5–7 years, or sooner if there are symptoms, keeps things tidy and trouble-free.

Popular questions about 2008 Honda Elysion fuel caps

How do they know the fuel cap is failing on a 2008 Elysion?

Common signs include a fuel smell around the rear of the vehicle, the cap not clicking when tightened, visible cracking on the seal, or a Check Engine Light with EVAP codes like P0456 or P0457. If the light clears after refitting a new cap and a few drive cycles, that’s a strong hint the old cap was leaking.

Can they use an aftermarket fuel cap on the Elysion?

Yes, but it needs to match Honda’s pressure and venting specs. Cheap caps can look right but still leak or upset EVAP monitoring. A genuine Honda cap or a reputable OEM brand listed for RR1–RR4 Elysion models is the safest bet.

How tight should the fuel cap be?

On the Elysion, tighten until several audible clicks are heard. That ratchet action is designed to deliver the correct clamp load without over-tightening. If there are no clicks or it spins freely, replace the cap.