Parts for your 2017 Haval H6-Fuel cap

2017 Haval H6 fuel-cap: what it does and how to look after it

Technical sources confirm the 2017 Haval H6 does use a conventional, threaded, tethered fuel-filler cap. The 2017 Haval H6 Owner’s Manual (Fuel and Refuelling section) details removing and tightening the cap until it clicks, while the H6 Service/Workshop information describes the EVAP (evaporative emissions) system that relies on a sealed tank and cap. Australian and New Zealand compliance (ADR 79/04 and UNECE R83) also requires a sealed fuel system to control evaporative emissions. So, the fuel-cap is absolutely fitted and relevant to this vehicle.

On this H6, the fuel-cap’s job is straightforward but important. It seals the filler neck to keep petrol vapours in and dirt, dust, and water out. That helps the EVAP system do its thing, reduces fuel smell, and prevents the check engine light popping up with EVAP leak faults after refuelling. A good seal also avoids splash-back at the bowser and helps maintain the designed pressure/vacuum balance in the tank during hot and cold weather.

As part of regular servicing, it’s worth giving the cap a quick once-over. Tighten it until it clicks after every fill. If there’s a faint fuel odour around the left rear guard, the cap is hard to tighten, or it no longer clicks, it’s time to inspect the rubber O‑ring for cracks, flattening, or swelling. Replace the cap if the seal looks tired, the tether is broken, or if EVAP fault codes (like gross leak/loose cap) keep returning. Use a genuine Haval cap or a high-quality ADR-compliant equivalent, cheap caps can cause EVAP headaches.

• Wipe the cap and filler neck with a clean, lint-free cloth to remove dust and grit.
• Don’t lubricate the seal with oil or grease, if needed, use a rubber-safe, fuel-compatible conditioner sparingly.
• Avoid over-tightening, turn until it clicks (usually 3 clicks).
• If the car has been in a rear impact or the filler door is misaligned, check the cap still seats squarely.

During scheduled services, asking the workshop to smoke-test the EVAP system is a smart move if there’s any fuel smell or warning light after refuelling. A fresh cap is inexpensive insurance against nuisance faults and wasted fuel vapours.

Popular questions

What type of fuel-cap does the 2017 Haval H6 use?
It’s a screw-type, tethered petrol cap designed to click when properly tightened. Genuine caps are tuned for the H6’s EVAP system, so sticking with OEM or a high-quality equivalent helps avoid check engine lights and fuel smells.

Why does my Haval H6 show a check engine light after refuelling?
Most often, the cap wasn’t tightened until it clicked, or the seal is worn. Tighten it fully, drive a few trips, and the light may clear. If it returns, have the EVAP system checked and consider replacing the cap.

How often should the fuel-cap be replaced?
There’s no fixed interval. Replace when the O‑ring is cracked or flattened, the cap won’t click, there’s persistent fuel odour, or EVAP leak codes keep appearing. Many owners find replacement somewhere between 5–10 years keeps things trouble-free.