I have a 2012 Dodge Charger 3.6 SE and sometimes when I either open or close the door more so when I close the door the fuel door pops open
Can someone please explain to me why
Thank you very much

Latch mechanism could be failing, or it just needs lubrication.

If your '12 is like my '12, it has a remote fuel door unlock button in the door?

Which door are you referring to when you say "either open or close the door more so when I close the door?" If you're referring to the Driver's Door, then year this could be easy to explain. As mentioned, the remote fuel door release is located in the driver's door. If the switch is failing, or the wiring for the switch is compromised, the jostling from moving the driver's door may be moving the switch contacts or associated wiring enough to trigger the fuel door release. I haven't looked into the diagram, but the switch likely just shorts a line to ground to release the fuel door, and if that's the case, if the trigger wire has damaged insulation somewhere in the door or in the accordion boot between the door and the cabin, that damage might allow the wire to short to ground when the door is opened/closed and release the fuel door.

-Rod

When I either open the door to get in the car or get out it'll sometimes pop open

thank you

wasn't sure how it was popping open
Thanks

As Magnoom was eluding to, if your 2012 has the fuel door release button in the driver's door, there's a relatively high chance that the switch or the wiring if failing and triggering the release when shaken from a moving door. More detail was provided in post #4 above so I won't repeat it here.

-Rod

Thank you