Hiya pal! Better off on the technical help "vehicle assistance" areas, but just to get started was it serviced recently with a new fuel filter - dead common for air leaks on the seal - SO - if it was, was that the first time you needed to give it a good boot, that could be a starting point. As you can see mine's a petrol, but I'm on here a lot and read plenty. the diesel boys will be more detailed, but do bung it on the other section to get their interest!