I am not familiar with a factory installed locking cap. If you mean the gas cap cover, there is a button on the lower left side of the dash board with a graphic of a gas pump. Pushing this unlocks the cover. Also, the remote key fob has a similar button.
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In most models, the button to open the gas cap is located to the left of driver on the dash near the driver's armrest. To open the gas cap, simply press the button.
on your driver side door there should be a button next to the gas cap opener. lift that button as if u would for the gas cap opener.
It is in the trunk... on the right side you should see a green circle behind the gas cap... pull it out it will release the gas cap..
Unlocking the car doors normally unlocks the cover for the gas cap.
open the trunk.Right where the gas cap is pull the carpet back to exspose the gas cap area you should see a buttom to manually open the gas cap
try pushing gently on the top corner of the gas cap door towards the front of the car
bmw x5 fuel tank release button
Just pull and twist til it comes out. Force the new one in.
give it a fast push down then prise up, it is an electric lock
lightly push on the gas cap door toward the rear of the car and it Will spring open. Do the same for closing it. Make sure to tighten your gas cap till it clicks and is very snug or you may get a service engine soon light. This is a simple fix, tighten gas cap.