Parts for your 2002 Daihatsu Gran move-Fuel cap

2002 Daihatsu Gran Move fuel cap — what it does and how to look after it

The 2002 Daihatsu Gran Move is fitted with a conventional screw-type fuel cap. This is confirmed in Daihatsu’s Gran Move/Pyzar G3-series owner’s manual (instructions to open the fuel filler door and tighten the cap until it clicks), and the Daihatsu workshop manual’s Fuel Tank and EVAP sections, which rely on a sealing cap to maintain system integrity. It also aligns with Australian Design Rule ADR 37/01 evaporative emission requirements and the NZTA Vehicle Inspection Requirements Manual, both of which expect a secure, sealing petrol filler cap. So yes — this model absolutely uses a fuel cap.

On this Gran Move, the fuel cap does more than just stop petrol sloshing out. It seals the tank against dust and water, controls vapour loss to meet emissions rules, and allows the evaporative system to manage pressure properly. A good cap helps avoid fuel smells, keeps the check engine light off, and protects the filler neck from grime.

With these cars now well into their years, the cap’s rubber seal can harden or crack. If there’s a petrol whiff around the rear quarter, the cap won’t click tight, or a scan shows EVAP leak codes (often P0440, P0442, P0455 or P0457), the cap is a prime suspect. Replacing it is quick, inexpensive, and often restores proper EVAP operation.

• Choose a genuine Daihatsu cap or a high‑quality equivalent that matches the Gran Move’s venting and seal specs. Avoid “universal” caps that don’t list Gran Move/Pyzar compatibility.
• At every service, inspect the O‑ring for cracks, flattening or swelling, wipe dust from the cap and filler neck, make sure the tether isn’t about to snap.
• After refuelling, turn the cap until it clicks — usually a few clicks. Don’t overtighten with tools.
• Locking caps are fine if they’re EVAP‑compatible and seal to OEM standards. If in doubt, stick with the factory style.

If the vehicle has failed a WOF/roadworthy for a missing or leaking cap, fitting the correct part generally resolves it on the spot. Given age, many original caps are due for replacement now, think of it like a small, preventative upgrade that keeps the Gran Move tidy, efficient and compliant.

Popular questions about 2002 Daihatsu Gran Move fuel caps

Can a loose or tired fuel cap trigger a check engine light?

Yes. A worn or loose cap can set EVAP system codes like P0440, P0442, P0455 or P0457 and may be accompanied by a fuel smell. Replacing the cap often clears the issue once codes are reset and the system runs its self‑test.

Is a locking fuel cap OK on a Gran Move?

It is, provided the cap is specified for the Gran Move/Pyzar and matches the OEM venting and seal characteristics. Cheap universal locking caps can cause EVAP leaks or refuelling difficulty — choose a reputable brand.

How should the cap be tightened after refuelling?

Refit the cap and turn it until it clicks firmly (usually several clicks). If it won’t click or feels gritty, clean the neck and inspect the seal. Replace the cap if it still won’t secure properly.