If you happen to have the smelly 2 component pvc glue, you could try to apply this sparingly over the crack. Even CA glue (loctite) might help - for a great selection of CA glues see www.leevalley.com - some are gap filling and have helped me in many repairs around the house.

But I agree, this should only be a temporary fix. A hose clamp (if it fits where the crack is) might relieve the mechanical stress on the crack - also temporarily.