I need to change the filler neck on my Duster as someone who owned it previously completely ruined the lip where the gas cap twists on. As a result, the gas cap does not tighten so there is no seal to the neck. I picked up another filler neck and was wondering if I can change it as-is? If not, will I have to take the tank completely out or could I get away with just loosening the straps and partially lowering it?