Rebuilding a 570 with a scored piston and cylinder on it. Got the new top end on it and now pressure and vac testing. Slowly loses pressure and will lose vacuum quickly. I assume crank seals so I pulled the flywheel, clutch and oil pump off so I could see bubbles and to my surprise now I can't build pressure at all. So out of curiosity I put the 2 oil pump bolts back in and now it'll build pressure but still loses it. Still not even one bubble from either crank seal. Then I notice some bubble coming from the oil feed line from the oil tank. Sure enough that's the leak. I didn't know that could even cause a leak. I attached a pic to show what I mean. Anyone ever seen this before? View attachment 20241002_155657.jpg