Open the fuel tank and inspect the fuel level. Fill the engine with gasoline and 2-cycle engine oil if empty. Remove fuel that is more than one month old.
Turn the switch to the "On" position. Feel to see whether the switch is loose and replace if necessary.
Remove the spark plug from the unit using a socket wrench. Inspect the spark plug for signs of rust. Replace it if necessary.
Look inside the gas tank and remove the fuel filter with a pair of pliers. Inspect the filter for signs of dirt. Replace if necessary.
Contact a Weed Eater dealer if the carburetor needs adjusting.
Remove the screws holding the air filter cover in place. Remove the air filter and replace it if necessary.
Press the spark plug into its hole properly if the unit is running hot.
Take the carburetor to a dealer for inspection and adjustment, if necessary.