I have a 562xp, I've ran it for around 4 hours. Today I ran three tanks of fuel through it. I ran out of the third tank refilled and then the saw would not stay running. I checked for air filter it was OK, I checked for air leeks found no noticeable holes in the boot or lines. I drove the saw to my shop about 20 min. Thought I would give it another try it ran just fine. Has any body else had this trouble. Or know what it might have been. Ill look into the saw some more tomorrow but thought I would get some opinions. I do have the muffler modded. Any thoughts or ideas would be great. Thanks for the help Ill check back later.