The water pump is used to pump water from the tank to the fixtures. If you don't have a tank you don't need a pump, however if away from hook ups you will be operating out of jugs..
You may have to block the lines that would have gone to the pump to have a watertight system when hooked up. The pump itself usually has a check valve
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Rick Davis 1602 K8DOC
61 tradewind, plus a few others
13 Ram 2500 TD
99 Dodge TD 577K miles
The purpose of the water pump is to pump water from the on board fresh water tank to supply the rest of the trailer with fresh water when you are not hooked up to city water.
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