I think they all have some sort of debris find their way inside. If it seems excessive, check to see if the fuel door is flush with the body? As long as your gas cap isnt letting sand in, I wouldnt worry about it
One thing I really worried about my gas tanks, all my import car gas door is lock, but american car gas door alway open ( that stupid ), is their any way to get gas cap look or gas door lock ? and where can I get one ? thanks
you can either get a door latch that has a lock on it (kinda unsightly) or a gas cap that has an actual key-lock configuration ON the cap as in it wont open or even turn without you disengaging the lock on the cap first.