No breakers on 12 volt
pump. a fuse is in order. ( I know, symantics) anyway, a noise is very prevelent if pump is running.
And as pointed out, the pump will continue to run until primed and pressurized.
If you have open valve or leak, it will not stop running.
A good way to test plumbing integrity. If any breach, pump will not stop.
I cant help but think that the pump water pipes are hooked up though. If your city water is working, the city water will pass through the same plumbing and possibly leak out of the pipes connected to the pump if it was not properly re-connected.
Hang in there.