hey... I used my rarely used chainsaw yesterday and it worked fine. Today I attempted to use it and the usual six pumps on the primer bulb didn't go as usual and the saw will not run. All the lines have been replaced recently and are intact and flowing freely, so it isn't that. It seems that fuel will not flow thru the carb itself. This unit doesn't see much action and still has the original chain even though it is about 10-12 years old. It is a McCulloch MAC 3216. Can anyone tell me what might be going on? Should I remove the carb and clean something? Rebuild it? Any idea on where to get carb parts? Thanks!

Personal Pace -- 2003 model -- had turned on side to remove blade and sharpen. Upon starting engine was making knocking sound and stopped soon thereafter -- would not restart -- with only occasional backfire seen. Realized oil was low at that time as well -- anything that could be done?