Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Just remove the fuel line from the tank and drain it into container. There is no screen that can be removed. Does the fule drain in full hose flow? If it does, tank is ok, Just replace with new fuel. Next you may want to remove the carburetor float bowl and drain and clean it. To see if engine will run,remove the spark plug, put a teaspoon of fuel direct into the spark plug hole, reinstall the spark plug and see if it will run for a few seconds.
Did you get the unit running?