I have a Poulan 20" chain saw that keeps leaking out the bar oil every time I put it in the container and store it. What causes this and can it be fixed by myself?

Most chainsaws have an adjustment for bar oiling and its quite normal for a chainsaw that is stored for long periods of time (weeks or even days) to leak out the bar oil. This is normal for chainsaws stored for several weeks or more.

Some of it may be reduced by adjusting the rate of flow for the bar oiler, read your manual carefully before attempting to adjust it. Adjust to too slow a flow rate will have adverse effects on performance and can lead to premature chain or bar failure.

Recommend that if you are going to store your chainsaw for more than a couple of weeks, drain the bar oil back out if it into a container (strain it through a paper towel before returning to your bar oil can). Also, you really should drain almost all the fuel and then run it until it shuts off if you are storing it for a month or more.