Originally Posted by
Valk
Your gas cap door should not open by itself when unlocking the car
It has its own latch to keep it closed regardless of whether car is locked or not
If it opens when you unlock the car then something is wrong with the gas cap door mechanism itself
+1
The gas cap door is sprung shut from the mid point of its movement and sprung open after that.
There is a spring opening latch just like those on some cabinet doors that when pushed against they spring open, Valk and I believe this is the cause of your problems, it does not stay down in the closed position.
The proof of this would be that the gas door would be open all the time you are driving and locked only when you use the fob to lock the gas cap door down by holding itdiwn snd pressing the lock bottom on the fob. Opening the locked car from the outside will let the gas cap door pop open a little.
The gas cap door is only locked when you use the fob, it does not lock when you use the switch on the console.