Parts for your 2008 Honda Stream-Fuel cap

2008 Honda Stream fuel cap — purpose, care, and replacement

Referencing technical sources including the Honda Stream Owner’s Manual (RN6–RN9, 2007–2012), the Honda Service Manual EVAP section, and Honda’s Electronic Parts Catalogue, the 2008 Honda Stream is fitted with a tethered, screw-type fuel filler cap. A fuel cap is therefore relevant and used on this vehicle.

On a 2008 Honda Stream, the fuel cap does more than just keep the petrol in. It seals the tank to support the EVAP emissions system, helps prevent fuel vapour escape and odours, and maintains the correct pressure/vacuum balance in the tank. That tight seal is why a loose, damaged, or incorrect cap can trigger a Check Engine Light with EVAP leak faults. The cap is also a safety item, reducing the risk of splashback and helping keep water and dirt out of the filler neck.

As part of regular servicing, it’s smart to give the cap a once-over. Honda specifies refitting until it clicks, that click indicates the seal is engaged. If the cap won’t click, is hard to turn, or the rubber gasket looks cracked or flattened, it’s time to replace it. A genuine or OE-equivalent cap matched to the Stream’s EVAP spec is the safest bet—generic caps that don’t vent to the right pressure can cause drivability issues or warning lights.

Between services, a quick wipe of the filler neck and cap seal with a clean, lint-free cloth helps keep grit from damaging the gasket. If the seal looks dry, a tiny smear of silicone-based lubricant can help, but avoid petroleum grease as it can swell rubber. The cap’s tether should be intact and secure, replace the cap if the tether breaks to avoid losing it at the servo.

Common signs it needs attention include a fuel smell around the left rear quarter, a cap that doesn’t click, visible cracks, or an EVAP small-leak code after refuelling. After tightening the cap properly, the engine light often clears after a few drive cycles, if not, a proper scan is worthwhile.

• Tighten: Turn until it clicks (don’t overdo it past the clicks).
• Inspect at every service or ~10,000–15,000 km.
• Replace if lost, cracked, won’t click, tether broken, or persistent EVAP leak codes occur.

Popular questions about 2008 Honda Stream fuel caps

Does the 2008 Honda Stream use a capless filler?
No. The 2008 Stream uses a tethered, screw-on fuel cap. Capless systems weren’t adopted on this model line, and Honda documentation for RN6–RN9 specifies a conventional cap that must be tightened until it clicks.

Can a loose or aftermarket cap cause a Check Engine Light?
Yes. If the cap isn’t sealing correctly, the EVAP system can log a small leak fault and turn the light on. An incorrect aftermarket cap that doesn’t match Honda’s venting spec can do the same. Refit until it clicks, and use a genuine or OE-equivalent cap if replacement is needed.

How tight should the cap be, and when should it be replaced?
Tighten until it clicks—usually one to a few clicks is enough. Replace the cap if the gasket is cracked, it won’t click, the tether is broken, there’s persistent fuel odour, or EVAP codes keep returning after proper tightening.