Is the impeller housing or the basket cracked? If it's the basket, drill a 1/8" or 3/16" hole at each end of the crack to stop the crack from "running". If you don't drill the holes the crack will likely keep growing longer, and then leak where repairs have not been made. Then sand the outside of the basket along the crack with 100 or 150 grit sand paper. Get some J B Weld epoxy, mix it, and apply it to the cracked area, make sure to fill the holes completely and leave it built up a little bit along the crack. This MIGHT or might NOT work on the impeller housing. Good luck!

Pappy