Sometime's the bags need a little more "help" to drain. Have you tried stepping on them to force water out and start the pump process again? These aerator pumps need to prime, and sometimes they get air pockets in there that prevents draining.
As for filling... it doesn't work? I thought you have full bags that won't drain? Anyway... check under the center rear seat, there will be some sprinkler valve looking things there with a black solenoid on top. There should be a little black switch on there. Try flipping that switch and seeing if that helps. The valves have a manual lockout, so it could just be in the locked out position.
-Mike
2006 Supra Sunsport 20V