I ran my 2000 Cummins out of fuel. I put 4 gallons of fuel in and I couldn't get it restarted. I tried the bleeding procedure that is used when the fuel filter is changed several times but I couldn't get it started. I ended up having it towed to a shop. They got it going by doing the same thing I was doing. The truck is running fine now but the shop said there still might be a chance that the high pressure fuel pump could have been damaged. My question is, what are the symptoms of the high pressure fuel pump when it starts to go bad.