Your water pump is kinda noisy. There are ways to quiet it down, but it takes some engineering to lengthen the water lines and mount the pump on a softer surface.
It's not a good idea to run the pump for more than a couple seconds when dry or else you could damage it internally.
When you turn the pump on, it'll run until the system is pressurized. It shouldn't come back on again unless you open a faucet- but if you do, then you know you have a leak somewhere. As you open a faucet and pressure drops, the pump will kick on again.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR