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Hello my name is ***** ***** I will assist you. If you have access to the water tank you need to check the vent. Make sure that the line is not kinked or blocked in any way. Also try blowing the vent with compressed air from the outside to the inside maybe something is blocking it. Finally if the vent is ok and you are sure there is still place inside the tank for more water you need to check the filling line for anything that may have fallen inside such a piece of cloth a tap etc... as normally that is the cause.
If you still require assistance let me know.
Hi again, the vent should be located in the mid of the boat starboard side under the side fender.