just had to replace my fuel cap and now with the new one on when i press the button inside the car to release the cap it wont pop open. took the whole unit off again and had a mate press the button while i checked the pin. pin seems to go in and out freely when the button is pressed so obv in working order. its as if when the pin goes in there is not sort of spring to push the cap out. have i missed something when putting the unit back in. did do a search but couldnt find any answer on the spring issue.