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It sounds like the spring mechanism is wore out on the fuel door or the hinge is rusted. If you have a helper handy, have them press the release button while you use the screwdriver to gently pry the door open. If you don't have anyone handy then check the trunk for a small pull handle release or a little compartment where you can release the latch. This would allow you to release the latch and pry the door open at the same time.