Fuel System With Common Rail Injection - MTU 12V4000Gx5S Series Operating Instructions Manual

4.2.7 Fuel system with Common Rail injection

1 Injector
2 Connecting line, HP fuel line
(only 16/20V engines)
3 Connecting line, return line
(only 16/20V engines)
4 Fuel return line from injec-
tor
5 Return line
6 HP fuel line (Common Rail)
Fuel system with Common Rail injection
The fuel system consists of a low-pressure system and a high-pressure system (Common Rail system). The
Common Rail system is controlled by the engine governor. Injection pressure, start of injection and quantity
of fuel injection are determined irrespective of engine speed. Injection pressures up to 1800 bar ensure very
fine atomization of the fuel and optimum injection and combustion conditions.
Technical data
Low pressure
The low-pressure system comprises:
• Fuel delivery pump, driven by a driver of the HP fuel pump
• Fuel priming pump
• Fuel filter and additional fuel filter
7 Additional fuel filter
8 Connection, fuel return to
tank
9 Connection, supply line
from tank
10 Fuel priming pump
11 Fuel filter
12 Fuel delivery pump
MS15065/01E 2019-01 | Series 4000 Engines | 53
13 HP fuel pump
14 HP fuel distributor
15 Pressure limiting valve
16 HP fuel line to injector