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First, the faucet should not be kept open for very long, just enough to purge some air. The water pump creates pressure and if something is open or there is a leak it will not achieve the pressure point for it to shut off.
If you know everything is closed up and the pump is still running then there is a loss of pressure somewhere. Either too much air is still somewhere in the plumbing or the tank or W/H are too low, or there is a leak somewhere that is causing the pressure loss.
Is there water running out anywhere under the rig? If there is a leak and you don't see water, then it's possible that the leak is in the walls or floors and it could take a while (and a lot of potential damage) before the water shows up. This could be hard to find. So let's hope it's one of the things already posted since those are the easy and obvious problems.
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