Chainsaw Repair

Gas boils at temperatures from 95F to 400F. The tank vent is important as a vacuum in the tank will lower the boiling point considerably. Make sure the vent is letting air in and not out. When the cap is removed you can hear the hiss of air. The question is which way is it going. Not recommended to check with a match unless you have a willing friend handy.
Higher elevations just make the issue worse. Winter formulated gas does as well.

Cory, if you run the tank dry, fill it up, cap it and shake the saw for a bit. That will build pressure in the tank and get the gas up to the carb faster,

I also have some filters I bought from Carbtech that have check valves of some kind in them to keep the gas from draining back.

The OEM Poulan 5200/5400/8500 fuel filter is like that.  Is Carbtech the site with the cheap carb rebuild and DG kits?  I need to check out those filters....