For a quick (and yes, permanent) fix. drill a small.... .050" or so hole through the post (red lines). Take a small (jewelers) file and notch the broke bit (red arrow).
Slather J B Weld (the original) on the pieces and run safety wire through the hole and around the notches. Once that's cured overnight, drill the J B Weld slop out of the hole and put it all back together. Or use a tooth pic to clean it out while it's still wet.
Note: That's zamak... an aluminum/zinc alloy. It forms a thin film of corrosion almost
immediately when exposed to air. Makes for a poor bond. Take a stainless wire brush and scrub the ends to remove the film. Have the J B mixed and ready... put it together immediately for best adhesion.
Note2: Make sure the safety wire pigtail is inside as far away from the float bowl as possible so it doesn't interfere.
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... a more elegant solution....
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