EJP

Hi, my 2003 Tdi Ford Galaxy will not start. It had not been started for nearly a year and it then started first time with a new battery. However, after about 20mins when i pressed accelerator it petered out and stopped and now turns over but will not start. The fuel was on empty but had enough in to run and i also put in an extra gallon. Any idea where i should start? Thanks in advance t anyone that can help i am really stuck at moment!