There are normally two inputs to the water pump. The output goes into the cold (blue) water line. The two inputs are: A. From the fresh water tank, and B. From a short hose designed to pull anti-freeze from a bottle. In normal operation, the valve to the tank should be open (in-line with the pipe) and the valve to the short hose should be closed (right-angle to the hose). While you are there, check connections that might be sucking air. (hand tight, or vise-grips VERY LIGHTLY) The pump should pull water up from the tank. If you feel the need to prime the system, place the antifreeze hose into a bottle of fresh water, and reverse the valves. Let the pump suck from it. Just enough to get it going. Then put the two valves back to normal, and again try to suck from the fresh tank.
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