BMW E39 Hot Start Problem?

Big problem with the 2.5 td engine happens when its fitted to omegas and range rovers too.Only way to cure it is to fit a new injection pump.Pump isnt sending too much diesel its just that it is injecting all the time the engine is cranking and when it does fire it burns the whole lot so it smokes.I think its that as the pump ecu sits on top of the pump body it gets hot when the engine has stood for a few minutes because when the engine is running or just stopped the fuel is used as a coolant and stops the ecu overheating.What I tried was letting it stand for 5 minutes to cause the fault then pour cold water over the pump and ecu and it fires up straight away.Normal injection pumps just go back to excess fuel position when you turn the motor off for the next start cycle but the bosch pump is fully ecu controled so it stays in run mode instead of start mode if it senses a hot engine and makes it a bi*ch to start.The real problem is that its not getting enough diesel at startup to give the pistons a big enough kick to carry on firing the next cylinder,when the engine is running the crank inertia carries it over so it only needs a small amount of fuel but this is not enough at cranking speeds so you have to pump a lot of fuel in eg 10-12 seconds cranking to get enough fuel injected to carry it over and fire up