Something similar might work, if the crack doesn't go all the way thru the bowl itself. I've often found gas weeps around the little pipe itself (when the pipe was good), and fixed those with the "gas tank sealant" epoxy found at auto parts stores. I used it on both sides of the bowl, above and below, to stop the weep thru the bad joint (corrosion from water probably did it: water corrodes these zinc-alloy metals).
If the pipe is cracked full length, then it will weep in the portion between the bowl and the outside (bottom), even if the pipe were soldered along the crack on both upper and lower ends. I tried that: it still weeped (CB750 bowl) right at the outer joint site. These little pipes were cast-in-place with the bowl when they were made. When the pipe cracks, it pretty well dooms the float bowl, sad to say. The ones I've seen cracked were plugged on their bottom ends with crud, then the bowls had water in them (deeply) and the water (condensation, slowly) got inside the brass pipe, and froze one day. When the brass moved (during the freeze) it also compromised the seal between the brass and the zinc bowl.
