There is a bit of a story with this one.
It arrived at my place having been off the road now for over 3 months. It has been to several other garages including the main dealer who have changed the Crank sensor, EGR valve, ECU, all 4 injectors a fuel rail and the fuel pump

It starts on the button and idles OK with no smoke or noises other than a bit of diesel knock. As you raise the rpm it gets to about 1500 and cuts out. If you bring it up slowly it falters at 1500 before dying . Giving a rail pressure limit exceeded code.

Checking rail pressure it is at 100-120 MPA at idle and gets to 180 MPA as it revs before cutting out.
Looking at the fuel rail , it leaks off as the pressure raises.
I immediately thought it may be the earlier pump fitted with the opposing pressure regulator, so as I had one in stock I tried swapping that but seem to have made it worse. With the other pressure regulator on I get 120MPA on cranking and it wont start. So Monday I will go back to the original.
Could this be a problem with the fuel ?
Does anyone know what the pwm should be as I guess my next move should be scope the pressure regulator