just had a quick look at the IVA manual and it seems that if it is not lockable then the cap must be tethered to the tank or body......see below
15. A fuel filler cap must positively locate to the filler neck and incorporate an
adequate sealing arrangement so that a fuel leak is not possible.
16. The fuel filler cap must either be tethered to the vehicle or be of a lockable
type where the key can only be removed when the cap is locked or an
automatically opening and closing, non-removable fuel filler cap
(Post 0 5 / 2009 vehicles only)
so I guess the deck filler would pass if it is tethered in some way.
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