hi dave,change your fuel filter & test your glow plugs
this is done by removing the power lead then run a wire from the positive on the battery & stroke it accross the top of the glowplug,if there's a spark the plug is working,if nothing happen's you will need to replace,this is done by removing with appropriate spanner by turning anti-clock wise taking care as the plug's may break,best of luck
steray
November 2008