Fresh Water System Issue

[sage_semper_fi]

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Hello All,
Background: I have been parked in a RV park for 10 -11 months. Over the last
couple of months I've noted a decline in the the water pressure inside the coach
while hooked up to the outside water supply. Incoming water pressure is okay. If
the water pump is turned on, the system pressures up and holds the pressure
normally. If the fresh water tank fill switch is engaged the sporlan valve
(R-184) activates but the pressure and volume of water going into the tank is
also very diminished.
I replaced the diaphragm and o-ring in the sporlan a couple of months ago and
all still appears to be okay.

Present:
This morning I awoke to find the water pressure in the coach to be non-existent;
nada; only a drip. Incoming pressure is still okay. System pressures up as
normal if the water pump is turned on. When the fresh water tank fill switch is
activated, the sporlan valve activates, the system pressure generated by the
pump is dumped but no water is entering the tank now either.

The maze of plastic and copper tubing under the bed is a bit confusing to the
non-informed. I traced it out as well as I can but I am drawing a blank as to
where a logical place a blockage might be in the system piping. I'm not certain
how the sporlan valve works and if it can be checked for flow across it without
removing it or not. Does anyone have any insights, fresh water system diagrams
or any suggestions in general?

Thanks,

David Hanvy 89 WB Crosby TX