Agreed here that it is the gas door (tank flap) locking mechanism. Check to see that the small plastic clip-in ring guide is in place, it clips into the metal frame and positions the sliding pin that locks the gas door. I had the same ripping sound which occurred when the clip-in ring fell out. If this has happened to you, you may find it sitting in the bottom of the gas fill cavity, clip it back in place and problem solved.
Best,
Joskin
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