I had one that fell out and was too loose in the hole. I took Loctite 620 sleeve retainer to it after cleaning with acetone. That was several years ago and it is still fine. JB Weld would likely work too, you have to use the stuff carefully so as not to plug something up. Pressing a smaller tube into the old tube ID works too. If it was a little loose solder works too being brass on brass. I would not use CA around gasoline.
rt