If the water heater was being filled, then you should be able to see the water level in the fresh-water tank drop.
You might nose around the water pump, and just make sure that the pump's intake tube/pipe is tightly attached. If there is an air leak, the pump won't prime.
Have you tried out the plumbing system with city water (i.e., a garden hose connecting pressurized water to the TM)? Any leaks?
What model/year TM do you have? Have you ever used the pump before?
Bill
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