Can't tell from the pic real good, how much is protruding from the radiator
I'll give you an example or two!
Flat out super-gluing it probably will not hold, however you might be surprised!
If you will explore around a hardware store or similar place you maybe able to find a tube or something with a tube, made onto it, that you can "w. Hack off" that will fit tightly fit over both pieces (Homemade Coupling). This will strengthen the whole deal up, and glue will hold this in place well.
As far as glue, There are 2, I would recommend. One being called "C.A." This is used on R/C airplanes and Cars--It is available in different thicknesses, the thicker, the longer it must dry. Basically is super-glue. A small $5-$10 bottle will last a long time. If you use the thinnest, assemble your parts and put a few drops around either side of the "Coupling", it will flow and seep in. 2 or 3 apps, should seal it. If you use the thicker, smear it on your parts, then install, work fast. It drys pretty darn fast too. You can get this wonderful stuff, at hobby stores
I use it a lot, as, If I were your pilot. You would not want to board my bird!
The other I would recommend is "JB WELD". Follow it's directions.
I recommend your coupling be "External", NOT! "Internal", as internal will restrict flow!
If there's enough there, even a tight fitting piece of fuel line, with hose clamps may fix you up. Screw type or the kind you squeeze the t. Its w/ pliers to open it up may work
Dependent on how round the surfaces are, may require a little filing/ sanding/ dremel tooling to get them rounder, to make a better sealing surface
Or just bring it by the house, we'll get it figured out!