Not enough oil output, chain is always loose after a few cuts. I have 3 / 8 s ,16 inch bar. And yes pump is on highest setting. Also carbide chain. I am cutting white oak logs. When saw runs out of gas , it will still have about half of a tank of oil. So i just installed a new oil pump , but its not any better. So is there any way to get more oil output ? Also saw will pretty much self feed in the log.