The pump outputs into a -10 line, into a filter, into a cooler, and into the block at the stock oil filter input location. Just above that input is the stock pressure sender location, where I have my current gauge attached. After speaking with several people, I believe one of several problems are possible - but I am looking for input / thoughts / whatever learning I can get. 1) The tank lines are too long, too far away from the pump, or simply the tank is too low relative to the pump for it to suck oil from the tank. 2) The head scavenge line is never below the oil level in the head. Specifically, it's basically in free air as far as I can tell. This seems like it's just sucking air into the system (minimal oil) and is asking more as a vacuum pump. Diagnostics I've done so far: 1) Removed the line going to the tank, and verified that the pump is sending oil down the correct line. Simply turning the pump at starter speed shows the lines are hooked up correctly... 2)... however when the car is running, there really isn't that much fluid coming out. Yes with 20 seconds of cranking I can fill a 1-qt bottle, but the stream doesn't seem that consistent to me anyway. 3) When the pressure has dropped, I removed the valve cover and ran the starter again. You can clearly see a few air bubbles coming out the oil galleys for the lifters. It's not foam by any stretch, but there are bubbles for certain. All suction lines made of anything other then hard tubing should have spiral widing coil added to them..like I said it a pain but needed for sure and vacum will hold oil to the top side also not allowing the oil to return to the pan and of course back to the tank... To see if its a low oil all is needed while at idle and it drops off open your tank and look...if its low then the oil is stagnate somewhere for sure....if there is as he stated a vacum suction line at the top of the motor and there where not enough areas of drain and no vents then oil will not drain back to the pan

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