Tim is dead on. Although this pic is a little blurred you can see a prong bent just as I took it apart.
http://i140.photobucket.com/albums/r19/LutherParris/52Panel/000_0200.jpg

In my photo bucket is also a pic inside the body. that little valve is "metal to metal" but if its right it will shut the water flow off pretty dang good.
With a prong bent it will restrict how much the valve closes.
Hope this helps some to.


1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile