Stop Spraying Starter fluid into the Carb unless you wish to rebuild the Carb . Instead use Carb Cleaner / Conditioner . Add fresh fuel to the fuel tank with some concentrated carb cleaner it's hard on gaskets , seals and diaphragm. Let it sit a few hrs . Then try starting the unit via carb cleaner sprayed into the carb or starter fluid with caution (just few sprays) within the Spark Plug Hole . In the future when you store your units use Stabil and use Lucas or Duralube Fuel Treatment on annual start up ...Get back to us should this not resolve your problem .

Before pouring any more instant-fix stuff into the carb or tank, lets have some more details. Is it difficult to start when cold or when warm? Does it stay running and run smoothly once it is started?

RB: Simple Chemical Addition is much easier and less costly then tearing down a carb or engine for a simple fuel starvation issue . "KEEP IT SIMPPLE STUPID!"