hi my son has a doblo that wont start it turn,s over almost start,s but then just die,s it seem,s like a fuel promlem it is a 1900 diesel no turbo has any one out there got a clue what could be wrong

I would take a quick look at the air flap (make sure it operates correctly) on the engine air intake and possibly the crank sensor. Failing that I would start to dread the dreaded rotor sensors

Often with these engines its best to go to dealer.