My flojet BW2000A quit pumping water. I can hear the motor running but no water.

Question edited for clarity and correct name of maker.
Question moved to a Flojet category.

It is either faulty or incorrectly wired (shorting to earth).

https://www.google.com/search?q=flojet+04300143+tripping+breaker

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get a meter and start checking components --switch motor relays ---if pump running and no out put need to check if air bound -pump seals leaking impeller damage or pump failure

Sounds like pump is worn out.

bleed the air out of the pump suction line or prime the pump

take it back and get an exchange unit under warranty
it is possible that it is sucking air and not water so make sure that the new pump is properly primed first

Is it whirl-pooling because the water is too shallow? One thing you can do to prevent this is to lay a piece of plywood over it. It will float and keep it from whirlpooling and sucking air.

Failed termal protection

when you close all cocks the pump must stop running after a short while, if not clean inside of pump (diaphragm and valves) and try again. If pump is continuously running try to pump 5 liter water of 70 deg. C if problem is still a continuously runnnig pump there is a electronical problem which can not be repaired or replaced in this modelrange

the diaphragm may be puntured so no pressure developing

Sounds to me like it just needs priming (or in other words) the air bled out of it.
Using the force of gravity, force water to run STRAIGHT DOWN from the 25 gal tank, through the gate valve & into the running pump.
While doing this, close the bypass valve slowly until it's about 3/4 of the way shut.
You should begin to hear the sound of the pump begin to deepen as the air escapes.
If you don't, then there may be an air leak somewhere along the hose line, typically at the filter, causing it not to prime.
Correct the air leak, then you'll probably have better luck.

I recommend not running an electric pump like a Flojet for very long when it's not primed. Doing this may overheat it & shorten its lifespan considerably.