I found your issue. Someone has put the locating pin in backwards, and it is leaking from a gap between the pin and the casting. I will drive pin out, clean, add some 3M 847 and drive in correct. Hopefully that will cure it for you.
Took about half an hour of running to get it to start! My wife thought I was nuts circling it with a flashlight for an hour 🙂
Ill post a video and picture here.