Today's progress if you can call it that, I've taken the top of the fuel injection pump off where the boost pipe from the turbo goes to check to see if the pin was sliding in and out.It looked very crusty in there like limescale in a washing machine I took the rubber diaphragm off I'd tried to remove the bar that the diaphragm sits on but I can not get it off to see wether the pin is sliding in and out, so I'm a bit stuck is the pump no good? Does anybody know of anyone that can fix my problems?