My brother has a diesel escort van, if you jump start it its firing up but then its cutting out not long after... what could this be, its obviously not overheating or spat any of the internals out.

Could it be dizzy cap or something like that?

 

How long does it run for?

 

escort diesel dont have a dizzy lol
it was leak off pipes when mine did this

 

Lol at the dizzy! Id say an air leak or injectors