Actually that is the low pressure/vacuum side of the siphon. So if all else fails, a stainless worm clamp holding it on would probably suffice, although ugly enough.
If you have 3 weeks before working on it again... perhaps try the craziest crazy glue you can find, let it dry, and then toss it back in the gasoline and let it sit and soak and see how it is after the 3 weeks?
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