I've used my soldering iron with a screw-in "paddle" attachment to fix ABS. It works really well.

Be sure you try using this setup on a SCRAP piece of ABS before you try the real thing though. The temptation is to go too light and the "weld" doesn't have enough material to hold.

This might save someone from trying to get the crack open enough to pump glue in, then the dreaded......."CRICK"........oops....too far.....

I would also take the hose clamp advice, after sealing the leak.