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I spliced in a new piece of hose on both my D1s (3/4 inch ID as I recall, but double check).
The PVC adapter was a tight fit so the old tube split again. Ended up wrapping with stretchy 3M self-adhesive tape (needs to stay very clean during install) and clamping with a hose clamp. Both systems have been holding pressure for years now (whoosh when gas cap opens after driving) and no more gas smell.
There are threads on this forum about how to completely replace the tube.