Python problems

I've had a Python about a year that I've used for clean and refill my
aquarium. When I used it today, it drained just fine, but when it came time
to refill, it wouldn't send any water out the hose to the tank. I took the
green plastic unit apart to look for clogs and was unable to locate any
problem. I also checked all the fittings with the hose and also could not
find any problem.

When I move it to the positing to fill the tank, the water sprays out from
the bottom and around the sides. Can anyone suggest what the problem might
be and/or how to fix this?

Thanks

Tony