If you can hear the pump running and there's no puddle of water on the ground the jets may well be blocked. I get it in our family cars due to the hard water in our area. Poking with a fine wire or needle sometimes helps for a while but it only pushes the obstruction back into the pipe so it can block up again.
I have recently taken to using Viakal limescale remover - half a cup in the tank and wait 20 minutes. It may begin working but not always - an overnight wait usually has the water running freely.
Good luck...
Peccavi
August 2009