Hi tjwoll05,
You're either out of water, despite thinking the tank is full, or you have an air leak on the suction side of the pump, or the pump isn't working.
Try covering the water inlet with something. If the 4-way Anderson Valve is leaking air through the water inlet, covering the inlet might allow the pump to work.
If that doesn't help, you'll have to take down the rear wall of the pass through basement storage to get to the pump. Make sure the connections are hand tight and check the clear plastic bowl on the suction side to make sure it's not cracked.