Too bad there is not enough slack to be able to re-attach the internal fill hose to the exterior fill fixture again. Ideally it would be best to have access to the tank and interior side of the fill fixture so the original “undamaged” hose can be inspected for damage and re-connected as required. If that is not possible one other method would be to extend the existing fill hose with perhaps a straight twin male barb fitting and two new clamps and some matching hose for the extension. I don’t know what your existing internal fill hose looks like (specs in other words) so a barb fitting may not even be usable as a solution.....there is always more future leak risk with more buried clamps etc. I also wonder if your tank vent line also runs to the exterior water fill fixture? It may need some extending as well? We all learn what not to do, the hard way, on occasion.
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