2007 Greyhawk 30 GS Kitchen faucet does not flow water. When on city hookup it works somewhat but takes awhile to start flowing. Using the pump it barely dribbles. All other faucets work normally. I took the screen out of the faucet but was not clogged. It's a three piece faucet with nozzle, handheld sprayer, and hot/cold valve. Thanks for any help.