Parts for your 1999 Daihatsu Gran move-Fuel cap

1999 Daihatsu Gran Move fuel cap

A fuel cap is absolutely relevant and fitted on the 1999 Daihatsu Gran Move. Daihatsu’s factory literature for the Pyzar/Gran Move platform (late-1990s owner’s manuals and dealer EPC/parts catalogues) specifies a screw-on, non‑vented, emissions-rated petrol filler cap located behind the exterior fuel flap. Workshop manuals for this model family also reference the cap as part of the evaporative emissions (EVAP) sealed fuel system, confirming it’s standard equipment rather than an optional extra.

On a 1999 Gran Move, the fuel cap does a lot more than just keep the petrol in. It seals the tank from dust and water, helps the EVAP system control fumes and pressure, reduces odours, and lowers the risk of spillage in a knock or rollover. A healthy cap also helps avoid rough running and hard starts that can crop up if the tank can’t hold the right pressure.

During servicing, it’s worth giving the cap five minutes of attention. Wipe the sealing face on the filler neck with a clean, damp cloth, and check the cap’s rubber gasket for flattening, cracks, or hardening. Make sure the tether isn’t frayed and that the ratchet mechanism still clicks firmly when tightened.

• When to replace: persistent fuel smell around the rear quarter, a cap that won’t “click” tight, a perished gasket, a broken tether, or an EVAP fault/CEL on scan (common codes include small/large leak).
• What to buy: an OE‑equivalent, non‑vented, unleaded petrol cap designed for the Gran Move/Pyzar. Avoid generic “vented” caps and cheapies that don’t list this model, as they can upset EVAP operation.
• How to fit: turn anti‑clockwise to remove, refit and turn until you get distinct clicks. Don’t over-tighten beyond the ratchet.

Good practice is to inspect the cap at every service or roughly every 10,000–15,000 kilometres. In Aussie and Kiwi climates—hot summers and salty air—the gasket can age faster, so replacing the cap every few years isn’t a bad shout, especially if the vehicle lives outdoors. It’s a small, affordable part that can save a lot of head‑scratching over fuel smells and nuisance warning lights.

Popular questions about 1999 Daihatsu Gran Move fuel caps

What type of fuel cap does a 1999 Gran Move use?
It uses a non‑vented, ratcheting petrol filler cap with a rubber sealing gasket and a tether. It’s designed to work with the vehicle’s EVAP system, so choose an OE or OE‑equivalent cap specified for the Gran Move/Pyzar.

Can a faulty fuel cap trigger a check engine light?
Yes. A loose or degraded cap can cause an EVAP leak, which often flags a warning light and stores leak-related codes. If the cap won’t click tight or the gasket’s perished, replace it before chasing more complex faults.

How often should the fuel cap be replaced?
There’s no hard expiry, but inspecting it at each service is smart. If the seal is hard or cracked, there’s a whiff of petrol, or the cap no longer clicks, it’s time for a new one. Many owners proactively replace the cap every few years in hotter climates.