For flood coolant what about using a pond fountain pump like this one -

http://www.diy.com/diy/jsp/bq/nav.js...&isSearch=true

I bought one for leak testing a job we did for the m.o.d., just threw it in a bucket of water and left it pumping water onto a bearing for 2 days. Worked a treat! Plugged a hose pipe onto the top were the fountain attachment usually goes.

They have a flow adjustment built in as well.

Michael - I have one in my garage if you want to give it a go.