I discovered that Whale fittings on my boat's fresh water
system would not leak water
under internal pressure but would leak air under the slightest vacuum.
This allowed copious volumes of air to enter into the system at the fittings from the tank to the pressure water pump
. This made all the faucets spit constantly.
By replacing all the Whale fittings with hose barbs and clamps, between the water tanks
and the pressure water pump
, the problem was solved
I might add that the Whale fittings are not inexpensive.