Loosen slightly the pressure side line on the pump. Run just a few seconds till it gets primed and puts out a little pink stuff then retighten.Look your plumbing over and go to the closest output weather it's the bathroom shower or kitchen sink and open fully the cold water line . Make positively sure every other line is closed . Run the pump till you get pink stuff then close and go to the next closest,repeat till all are done then repeat with the hot. Next year drain the tank manually and not with the pump and you'll not get air locked .
Good Luck, Mike
