I was wondering if it's normal for the fuel cap to unscrew itself fairly easily. I always open the fuel door and wash inside during a car wash. When my wash mitt comes in contact with the plastic tether piece, it unscrews itself. I'm concerned that I've gotten water in there another time when I didn't notice it was loose until after I had rinsed my car. Not only that, the fuel door mechanism sticks. I guess this is common, though.