Check the air pressure in the pressure vessel with a car type pressure gauge. Should be 5 psi at least. Any water that might come out of the valve means you have a leaky diaphragm in the unit and it will need to be replaced. Look underneath the unit for blemishes in the red paint. (That would suggest a pin hole). If air is leaking out you should be able to feel it or hear it. Please note pressure on the fixed gauge on the system DOES NOT mean there is air pressure in the vessel. It's a bit like a leak in a bike tyre.....
Silver Surfer
May 2010