So bummed...Power Steering is gushing fluid

When refilling a pump after working on things the fluid get's aerated from the pump circulating air bubbles.
The pump compresses the air in the fluid, then when you shut the engine off the fluid/air expands and blows fluid out.

This is why I recommend people only put in just enough to cover the pump until it has been started and shut off a couple of times.

In other words keep the level of the fluid low until it gets done circulating the air out.

I'll literally bet 5 bucks on this being the cause, or you would have seen fluid leaking while it was running. :D