The release lever is not opening the gas cover.

while someone is activating the release lever/button, gently pry the cover open
The problem will be a broken spring at the hinge of the cover that flips the cover open when operated
springs are readily available fro ford spares

Hi fellow,
Your problem has two options ;first, you have to inspect the interior wire that pulls the lock of the gas cap.If found cut you should replace it at the mechanic's. Secondly, once the wire remains uncut or undamaged by any reason, the lock itself might be jammed due to the rust or misuse. Therefore, you are advised to use some anti rust liquid it wil work. Good Luck.

It may be that the hood release cable has streched so there is no tension when pulling the leaver. Try to reach reach above the lever and pull the cable making it less slack and then pull the lever all the way up with your other hand and hopefully this will open it, if this works i suggest replacing it before it stretches even more or snaps and you wont get it open..

there is a release lever in the trunk beneath the gas cover you can push to release

Open the trunk and behind the trim cover near the gas door only on the inside there is a cable pull there also. the owners manual will show you where it is it you have it.

You might try having a friend bump the gas cover with the heel of their hand while you **** briskly on the release. Have done this a couple of times and once opened, you can use a little lubricant on the exposed parts. Sometimes that is enough.

Check to see if your lever is broken under neat so you are not ablle to pul cable to open it.

PULL ON THE RELEASE LEVER SOMEONE TAP HARD ON THE OUTSIDE COVER IF THIS DON'T WORK PULL ON THE CABLE WITH VISE GRIPS IF THAT DON'T WORK INSERT A SMALL FLAT BLADE SCREW DRIVER IN THE DOOR AND TRY TO RELEASE THE HINGE.

my Jaguar X Type gas cap "sticks". I can open it by wedging a corner of a credit card in the left side or the cover, then go in the car and pull the lever. There are two flimsy metal bands that hold the cover in place and they sometimes bend and then the release doesn't work.  it should open easily with the credit card wedged in; then bend back the metal bands into shape.