[AMGowner]

Sounds like you have the wrong model cap. Our 2017 45 has the tether that we hang over the hook on the fuel door to hold the cap away from the body when filling.

Could be just be a misreading/mistyping thing, but hanging by the tether? There’s an actual cut out in the hinge of the flap to fit the entire cap into, as can be seen on the pic posted above.