VW Golf GT TDI wont start?

i conected my car radio and blow a fuse. I replaced it but now 1 of my engine fuses keeps blowing everytime i start my car, so my car wont start. It turns over but just wont fire up. a hour before this happend i ran out of fuel. I have a VW Golf GT TDi. I have heard that it could be a air lock in the fuel lines? Ill also add that the car fired up fine and i was driving around for atleast a hour. But would not re-start. HELP!!