Chainsaw Repair

Hey fella's, my Poulan made 3.7 has developed a bar oil leak recently. Full tank or half tank, if left overnight there will be a puddle under saw. Takes several days to get near empty . Two years ago I replaced the gaskets and diaphragm and it has worked fine until recent leak. The manual and auto are still working. I have not been able to  find leak. I replaced the cotter pin tank vent with a plastic tube vent that reaches across tank to opposite side , ( like a wild thing vent).  I probably should have left the cotter pin in tho.

     Has anyone run into this ? I appreciate any input.    Chris

Can you pin point where the leak is.   For example is it coming from around the metal plate that holds the diaphragm. 

 I myself own close to 10 saws that use that type of oiler but I usually drain the oil when I am done using them because of leaks.   

   Also you can try and set the saw on a piece of cardboard and then check it in about an hour to help in finding where the leak is coming from.   

If it is coming from the oiler hole itself where the bar is then try opening the oil cap to release pressure from the oil tank and see if it stops leaking.