I have a hard time believing you dont have a city water fill port.
My Fuzion 342 it is located on the opposite side of the trailer between the 2 man doors and just above the fender well.
Here it is on mine. I just looked at pics of Fuzion 310's on google and it has the city water fill port in the same location
Fuzion 310 water fill
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2013 Fuzion 342 Monster Edition
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