Fuel High Pressure Pump Peugeut Boxer 2.2 HDi Error P0093

Good day, the following problem: Motor Starts after a long organ he can hardly hold the speed, the tank indicator is at 0 while the vehicle runs and after a short time the vehicle strangles. It feels as if at the beginning enough fuel pressure still comes on the injection nozzles but falls down quite quickly and it is not enough for the engine and then runs out. So much for my 3 estimation. Error memory says from P0093 thus large leak in the fuel system. a -So far I have cleaned the fuel filter – Changed the fuel pressure regulator on the rail – Changed the fuel pressure sensor on the rail – Changed the pressure control valve on the high pressure pump – Changed the injection nozzles all but not yet Programmiert since you need a constant running of the engine which is currently not the case. My last guess would be that now the high pressure pump does not build enough pressure. how should I proceed or in the best case a high pressure pump for exchange might be lying around? I would be too thankful for you the vehicle is now unfortunately already there half a year and I just can’t get any further. Thank you in advance.