I have the above vessel and is wondering where / how do you access the freshwater pump. I hear it running but am getting no water out of the recess shower spray head or any of the sinks.
On our 2002 Islander it is located under the upper step going down into the cabin. On the forward side of the athwartship bulkhead separating the cabin from the bridge deck compartments.
I had the same problem with my 02 Islander. There is a screen type filter attached to the pump. My filter got clogged and restricted the flow. May not cure your problem but it may help.