***** is right, when you run those out of fuel you run the risk of doing damage to the pump. Also a quick tip for anybody else with bleeding issues is to remove the 4 glow plugs and than crank the engine with the lines cracked loose. Without compression the engine will spin with no effort which means it turns much faster and does not kill the battery. Also once you tighten the lines you will see a mist of fuel blowing out of each glow plug port. BTW you will never find a new pump LOL! Where or who did you convince to sell you parts for the pump?? I just send mine out for rebuild as a home mechanic will never get it to work right ( No calibration machine, must be laboratory clean conditions etc...........)