Most of the small pumps are diaphragm operated and will not work well to pass water when not operating. Add the outside fitting with a hose connector for city water and the make the pump an add on between that fitting and the water jug when city water is not available. One thing to take into consideration is a sure fire method of knowing when the tank is full. My suggestion. Do the deck ( inspection ) plate mod to the tank, then add two nylon thru hulls at slightly different levels on the side of the tank near the top. The upper one could be attached to and external fitting under the TM and the lower one run thru the floor as an overflow when the tank is full.
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