Parts for your 2018 Haval H6-Fuel cap

2018 Haval H6 fuel cap — purpose, care, and replacement

Yes, the 2018 Haval H6 uses a conventional, screw-type, tethered fuel cap. This is confirmed in manufacturer literature such as the Haval/H6 Owner’s Manual (fuel filling section) and Great Wall Motors (GWM) electronic parts catalogues that list a dedicated fuel filler cap and seal for the model years around 2018. A sealing cap is also required for the vehicle’s evaporative emissions (EVAP) system to meet regulations commonly applied in Australia and New Zealand, so a capless setup is not used on this model.

On the 2018 H6, the fuel cap’s job is straightforward but critical. It seals the filler neck to prevent petrol vapour loss, keeps dust and water out of the tank, and maintains the right pressure for the EVAP system so the engine management can do its job properly. When the cap doesn’t seal, owners may notice a fuel smell, rougher starts after refuelling, or a check-engine light due to an EVAP leak code.

As part of routine servicing, a quick check of the cap is well worth it. The cap should be tightened until it clicks, the tether should be intact, and the rubber O-ring should be soft, uncracked, and free of flat spots. A light wipe of the filler neck lip removes grit that can compromise sealing. If the cap has been dropped, cross-threaded, or left loose repeatedly, replacement is cheap insurance.

When replacing, a genuine or OE-equivalent cap designed for the H6 is recommended. It will have the correct pressure/vacuum relief and sealing profile for the EVAP system. Avoid universal caps that don’t specify compatibility with the H6’s model year. After fitting a new cap, it can take several drive cycles for any EVAP warning light to clear once the system sees a proper seal again.

• Replace the cap if the O-ring is cracked, swollen, or missing
• Replace if the click mechanism no longer engages or the tether breaks
• Inspect at each service or every 12 months, typical replacement is only needed when wear is evident

A sound, correctly tightened fuel cap helps the H6 run cleanly, keeps the cabin free from petrol smells, and avoids nuisance warning lights that mask other faults.

Popular questions

What type of fuel cap does the 2018 Haval H6 use?
The H6 uses a threaded, click-to-tighten, EVAP-rated cap with a rubber O-ring seal and a tether. It’s designed to maintain system pressure and prevent vapour loss, so a vehicle-specific cap is recommended.

Can a loose fuel cap trigger a check-engine light on a 2018 H6?
Yes. A loose or worn cap is a common cause of EVAP leak codes. Tighten until it clicks several times, drive for a few trips, and if the light remains, have the EVAP system smoke-tested.

How often should the fuel cap or seal be replaced?
There’s no fixed interval. Inspect at each service. Replace if the O-ring is cracked or hard, the cap won’t click tight, or there’s persistent fuel odour after refuelling.