Check all the lines, and the filter.
To test the pump, use a bucket of fuel (kerosene is a better choice to be honest) and a couple of hoses. See if it pumps anything. Then kink the hose and see if it shuts off if it is in fact running.
To test the pump, use a bucket of fuel (kerosene is a better choice to be honest) and a couple of hoses. See if it pumps anything. Then kink the hose and see if it shuts off if it is in fact running.