I was gone to Florida for the winter and turned off my water. When I returned and turned the water back on, everything is fine, but my outside anti-syphon faucets won't come on. I have been under my house and nothing is leaking and pipes leading to the faucet and other outlets are fine and I can't figure out why I have no water at these faucets. Is there something about anti-=syphon faucets that would prevent them from coming back on after they haven't been used for a while? Anyone that has any ideas I would appreciate hearing from. Thanks.