Just bought this V70 three weeks ago. Third time to fill it up yesterday. I pressed the fuel door button. When I went to open the unlatched fuel door it popped off and was dangling from the side of the car by the filler cap. I was able to set it back in and it is now locked. I cant figure out the hinge mechanism. I don't know if a piece is missing or if the pin just snaps and I am not lining it up correctly. Any advice is appreciated.