Something like this? There are similar pumps that you plumb in at the lower radiator hose also. Search enough and you’ll find something ideal. Turbo car applications seem to be another source of info regarding these type pumps.
That does look good. I wonder that when its connected to the radiator hose, but not running, does it allow fluid to run right through it?
I know some electric fuel pumps will do that, if you want to hook one up in line with a mechanical for easier starts, but not all of them do it.
