Daihatsu have re called all Sirions and the Early Terios to have the Fuel Filler Pipes checked. They are failing due to corrosion. (Does not surprise me because of their position). I have had my Sirion and Terios checked and both pipes are to be replaced Free of Charge in the next couple of weeks.
Phone or call in to your nearest Daihatsu Dealer to arrange a free check. If needed they will order a replacement kit and then you can arrange to have it fitted. All they need is your registration number and they can check ok. Some dealers have not heard of the recall. Get em to check it out with Daihatsu.