Yes, thanks, I googled it this morning. I have never "bled" a simple double acting cylinder. I might have to hunt up a new suction hose, it's hard and been there a long time. After that was considering pump shaft seal. Another thing missing on these is a gage port.
A filter change trouble shoot usually doesn't do much but did put new on any way as the old one was on for 20 years or so. The hose isn't leaking at the bottom, spose it could be at the pump though as this just started
It's so old a crack is a possibility.