I guess I'm just a tad confused by your very last part as I'm not overly sure how the fuel door lock could be "bent" unless somebody tried to force it open, so I'll just kind of go over the whole thing.
The fuel door is usually operated by the fuel door release lever located in the driver's B pillar. It is an L (well.. kind of an L) shape lever that actually pulls the cable towards the back of the car, not outwards. If you're tugging on the cable just straight out, then you may not be applying the same tensile strength and direction that the lever would apply if it were in place.
I do not have a diagram of the lever layout on the interior side. However I do have one of the fuel door assembly and how the cable is routed. Even though you didn't mention what model and year Fiero you have (remember, ALWAYS do that in tech as your first sentence when you ask a question), in this case it is actually the same setup regardless of whether or not the car is a notchback or fastback.
((Diagram courtesy of Bloozberry))
If your fuel door or fuel door actuator setup is damaged and this is a car you just recently bought, then the prior owner likely was not made aware of the auxiliary method to open the fuel door. Pontiac recommends in the owners and service manuals that come with the car to use a flexible plastic card to pop the fuel door open if it becomes lodged. The reason is that the fuel door and fuel neck pocket setup is made out of very similar material as the actual rear body work clip itself, meaning if you try to pry on it you can break the body work and thus causing massive need of repairs.
However, the card-in-the-fuel-door-latch trick should only be used sparingly. The fuel door latch on the body side is only held on by one screw. Repeated pushing of the latch on the body side can potentially wear out the top side notch that the latch slides into, thus causing it to eventually begin to slip and not properly latch against the fuel door hold-down.
As far as potentially purchasing any of the components that operate the fuel door, I don't think anyone actually offers any of those components reproduction currently. The reason is that when the fuel door latch and lever assembly is properly serviced it should last for the life of the car. I'm approaching 300,000 miles on my GT and have no issues with my fuel door, nor has any of my Fieros ever had such an issue.
[This message has been edited by Fiero84Freak (edited 08-23-2013).]
