Found the pictures, a small bilge mounted at the bottom of the live well. Ok if thats the original solution I understand you must think i'm blind if I missed it. But actually it's not there any more. I guess som previous owner took it away.

But why do I need a pump there? There is a drain hole in the bottom of my well? Do you use the pump to prevent bait and fish crap to plug the drain hoses and /or find its way into the boat ?/

//newbie