Iirc if it has the fuel pipes running from the pump to the injectors as in four pipes one to each injector then there will be a bolt at the back of the pump with a lock nut on it. and a slot in the top of the bolt for a screwdriver. there will be one on top of the pump as well that is for the idle speed its the one by the fuel "in" pipe if you undo the nut and turn anti clockwise it will put more fuel into the pump and the other way puts less diesel in. Thats going off the same as my old diesel. Hope that helps.
