Pump should pressurize the system and then turn off. Opening a faucet drops the pressure and the pump kicks back on and runs until the system's pressure stabilizes again (the pressure switch is built into the pump). Most likely problem is that your city fill valve is turned to "tank fill" position (that allows the pump to draw water from the tank, pump it into the system, and then dump it back into the tank; an endless circle). Otherwise, you have a leak somewhere.
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2004 Itasca M30W
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