Parts for your 2000 Daihatsu Gran move-Fuel cap

2000 Daihatsu Gran Move fuel cap

Based on Daihatsu’s factory literature, the 2000 Daihatsu Gran Move (also known as Pyzar, chassis codes G303/G311) is fitted with a conventional screw‑type fuel tank filler cap and relies on it as part of the sealed evaporative emissions (EVAP) system. This is documented in the Daihatsu Gran Move/Pyzar Owner’s Manual (1998–2001 editions: refuelling and fuel filler cap instructions), the G303/G311 Workshop/Service Manual – Fuel System section (cap sealing and EVAP leak diagnostics), and the Daihatsu Electronic Parts Catalogue, which lists a “fuel tank filler cap” for Gran Move/Pyzar variants. So yes—the fuel cap is relevant and used on the 2000 Gran Move.

On this model, the fuel cap does more than just stop splashback. It seals petrol vapours inside the tank, helps the EVAP system control fumes, and protects the filler neck from dust and water—handy for Aussie and Kiwi conditions. A good cap also maintains the designed pressure/vacuum relief, so the fuel pump isn’t working against a leak or a vacuum that shouldn’t be there.

Owners will often spot the signs of a tired cap before anything else: a whiff of fuel near the rear quarter, a cap that won’t “click” tight, or a check engine light after refuelling. On OBD‑equipped Gran Moves, EVAP-related fault codes (commonly P0440–P0457) can be triggered by a loose, cracked, or wrong‑spec cap.

As part of routine servicing, it’s smart to give the Gran Move’s fuel cap a quick once‑over. Wipe grit off the filler neck, lightly clean the O‑ring/gasket with a damp cloth, and tighten the cap until it clicks. If the seal looks flattened, the tether is broken, or the cap is warped, replace it. A quality OEM‑spec cap designed for G303/G311 models is the safest bet, avoid generic “vented” caps not intended for sealed EVAP systems.

Replacement is straightforward: remove the old cap, check the neck for nicks, and fit the new cap, confirming a positive click. After replacement, a brief fuel smell or a light hiss on removal can be normal, persistent smells or repeating warning lights point to further EVAP checks (hoses, canister, purge valve).

• Inspect the cap at each service (or every 10,000–15,000 km).
• Replace at the first sign of damage, unreliable clicking, or recurring EVAP warnings.
• Choose an OEM or high‑quality equivalent with the correct sealing and pressure relief spec.

What type of fuel cap does the 2000 Gran Move use?

It uses a screw‑on, sealed fuel cap designed for a closed EVAP system. For best results, match an OEM‑spec cap for Gran Move/Pyzar G303/G311. Universal or vented caps can cause leaks, fuel smells, or warning lights.

Why does the check engine light come on after refuelling?

Most commonly, the cap wasn’t tightened until it clicked, or its seal is worn. Refit and click it firmly, then drive a few trips. If the light persists, inspect the cap’s O‑ring and consider replacing it before chasing other EVAP faults.

How often should the fuel cap be replaced?

There’s no fixed interval, but in Aussie/NZ conditions many caps need replacement somewhere around 5–10 years. Replace sooner if the seal is cracked, the tether breaks, it won’t click tight, or you’re getting repeated EVAP leak codes.