Poulan 285 Pro Problems

I have a Poulan 285 Pro chainsaw that will start & run as long as the fuel trigger is in the wide open position, once you release the trigger, & try to again give it fuel,it dies. However if you start the chainsaw, and law it on it's side, as if you are going to fall a tree, the blasted thing runs great, as soon as you again upright the saw, it dies. I have checked the fuel lines, fuel & air filters, fuel tank, & fuel tank vent. Have removed the carburetor, cleaned, & installed new gaskets. This thing is about to drive me insane. I sure hope someone has encountered this problem before, & can give an answer as to the cause. Thanks, ARMason

 

Sound to me like the fuel lines are bad and leaking, the tilitng on it side could be the fuel filter has come off the line in the tank. Have a good one. Geo

OOps sorry, I see you already checked that.

 

Any adjustments on the carb? Open the screws 1/4 turn. Have a good one. Geo

 

Try filling the tank completely full of fuel, right up to the the rim, cap it and see if it does the same thing.