Did you change the fuel filter at this time, if so then you must bleed the system. Take the fuel filter off then fill with diesel and re attach and try starting.
If you did not change the filter then check if you are getting 12 volts on the termanal on the rail that connects glow plugs when you switch the ignition on, if not then check the fuse for the glow plugs.
Scott Mcculloch.
May 2007