Thanks everyone for the great advice.
I'm going to try one more time with the glue fix. I see that Loctite has a 2 part plastics bonding system that purports to bond well with polyethylene. I feel like the connection would be strong enough if the glue actually bonded the fitting together.
If this fails, I think I'll just bite the bullet and take it to my dealer for a fix. Hopefully they have a way to patch and spin weld a new $1 fitting on.
I like the idea of a mechanical fix. However, I fear that punching more holes in the tank will just put me too far down the path of no return...
