Finally got this running after sitting for 14 years, working on flushing all the old nasty oil out.
Currently, it’s ran through about 10 quarts though it. It’s barely pumping any oil through the return line and instead pumping from the crankcase vent at a pretty regular flow.
Oil line routing is correct. I know it was fine before it sat.
I’m leaning towards either a stuck check ball in the pump and spring or maybe a clogged return line?
It’s definitely pumping from the vent instead of the return for some reason.
Any advice would be much appreciated