Why won't my new pump work?

[Rychek]

you have the impeller installed incorrectly. Make sure it goes into the little rubber pieces. You are overstressing the impeller inlet, and the excess pressure is probably keeping it from moving properly.

I checked the impeller and made sure the shaft was properly seated, but that didn't help. I tried running it in very shallow water (just enough to cover the pump), but that didn't help either.

turn it on and blow into the tubing to force air the opposite way and that will probably solve your problem.. try it

I'll have to try this when I get a chance.