Originally Posted by Philzy3985
It isn't an impeller type. It has the 4 plungers inside of it. I ripped it out and took apart every section down to the motor and spindle. Everything seemed okay, but I don't know what the difference is between "new" and "broken". It was manufactured in 2008, but like I said, was not used for at least a year by the previous owner.
I called shurflo (It's their extreme series, most $$ 4 gpm pump) and they said that when my tanks went dry that could easily break it. Rather than rely on a specific replacement part and my amateur plumbing intuition, I bought their next cheapest 4gpm pump, which is safe to run dry on. Hopefully I can plug it right back in and be back to normal.
Anything specific I need to remember when reinstalling a new pump?
Some pumps are designed to have a pressure tank and others do not work well with them. They keep the pump from cycling as often.