Make sure the line from the pump head to the pressure switch isn't plugged up. Goulds pumps seem to do this pretty often.
Turn the pump off, drain the system, and remove the 1/4" line. Take a piece of wire and run it through the fitting on the pump head. This should clear any debris out of the way. Make sure the hose isn't plugged up, too.
You'll lose prime when you do this, so be sure to fill the pump and suction line up before you run the pump.