As Bunny says I would stay with the convoluted hose to ensure the flexibility required, it would seem you overheated the hose and it has stretched the aperture. You may well need to get a replacement hose.
I appreciate the advice. I will say even after I heated it, it was very difficult to fit the hose to the upper male part of the module; very tight fit. So I am surprised that it loosened so much. makes me nervous about the same tubing staying on even with clamps, and I have not found different suitable plastic tubing. Thus, I was thinking that some traditional fuel line hose would mate more securely.
