since i had my car my gas door would always open up when i park because the ring on my lock was broken. Not anymore, i shaved the thing off and replaced it with this sturdy piece. The picture i have taken is of the broken piece and the one in sketch-up is the replacement.
PS. I know this isn't the most effective way to fix your gas door but hey! it works!
(not to replace for unbroken locks) Completely cut and shave off the little locking arm on the gas door. After doing so make sure you sand the paint off the small area where your putting it, then you can apply a industrial plastic glue/ adhesive to the end of the printed lock and place it on the proper area.