On the left and right of the cut- away manifold, see the rail pressure sensor and the rail pressure transmitter. By turning the clamp screw grip,you see the generation of the high pressure. On this modelboard, the most important elements of the common rail injection unit can be setup and connected to fuel lines. Further, the return passageof the fuel can be seen.  From here, the fuel is pushed intothe cutaway manifold and then enters the injectors.The fuel is fed by the feed pipe (gear wheelpump, cutaway) to the high-pressure pump.