Probably got a piece of junk in the end of the pee tube that you can't see. I had this happen to me while fishing the KY Lake grass several times this year.

Here's what I did to fix it: first, straighten our a hook, next (if you're trying this at home) hook up your hose and turn the motor on. Finally, take the hook and run it in and out of the tube. Should clear the problem right up.