Super 2 oiler issue

[50v]

Can’t get my chainsaw to oil . Short of installing new diaphragm I have installed new line , checked the tank , for cracks and blew all passage ways out . I did install a duckbill valve out of a lawnmower cap but it fit on the brass tube inside the tank fine . I have been using old diaphragm s out of 3 separate saws but none have worked . None of them appear to be cracked but they definitely aren’t new . I have tried priming the lines and doing the oil can trick of covering the oil outlet hole with the saw on its side while running. Not sure if this is normal but when I blow on the line running into the tank through the duckbill to pressure up the tank to get oil through the diaphragm via the oil pickup tube to the outlet hole I can’t get oil to push out and I almost seeing stars . There is no way the crankcase pressure would be this high but maybe the system has to be closed to work . I do not not plug the outlet from the crankcase when I am blowing . Blowing through the crankcase outlet moves the piston so I know that line is clear. Also running the saw without the duckbill installed eliminates oil and fuel excess dripping out my exhaust. The saw starts and runs fine . Why do all these saws I have , have a open hole 3/4 of the way up the fuel tank exposed to the open . Is there supposed to be some sort of tank vent installed since all my fuel caps are none vented . Open to suggestions. Diaphragms on eBay are starting at 45 USD so I want to make sure I have tried everything

[Clasec]

There should be a duckbill in the hole in the oil tank to hold pressure. Here is some more info on the line orientation.      houseofhomelite.proboards.com/thread/10474/xl-smoking-chimney

[blythkd]

Probably the most common issue is when someone installs new oil lines and hooks them up backwards. Most guys will run them straight across to the nipples when they should be crossed. This usually makes the saw smoke like a locomotive because the pulse port on the engine is drawing oil from the tank. This also keeps it from oiling since the oiler is trying to draw oil from the pressure line at the top of the tank.

Something simple to check out.