Loud humming and vibrating coming from gas tank
 

I have a 2016 Ford F-150 Xlt 2.7 L twin turbo pick up. I recently had a engine code P1450 pop up and it means there is a vacuum in my fuel tank. This morning I heard a loud humming and vibrating coming from the fuel tank and when I pushed on the cap it was almost acting like it was purging. Check out the video I put on here to see what i’m talking about. If you’ve had this happen or have any ideas on how to fix it please let me know. Thank you!

Solution???
 

Hey I’ve a 2016 F150 2.7 doing the exact same thing. How did you fix the problem? Any info would be much appreciated. Thanks