You could probably buy a locking unit that is used on some of the older cars like a door lock but it would require keeping another key and also drilling a hole in the flap . Maybe you can buy just a locking cap only this one might work as it is for VW and I would be sure that all their cap threads are the same Fuel Petrol Cap + Keys VW Bora Jetta 98-05 PASSAT B5 91-02 Locking Tank New This one seems to have a huge range of various cars and many VW models as well . Fuel Filler Tank Cover Cap Fits AUDI MAZDA MITSUBISHI L NISSAN VOLVO VW 1974- | eBay
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