Overflow question...

Hi all,

I am very new to this and I'm trying to understand the overflow/sump system.
My question is in a non-drilled tank if the overflow looses siphon, will the
return pump 1) overflow the display tank and 2) will the pump burn out
running dry once the baffled sump space runs out of water?

Thanks for any clarifications. These might be silly questions and if so I
apologize in advance, but I was just trying to figure this out on my own and
not sure of what safeguards might be there.

Sincerely,

Steve