BMW N55 - Fuel Injection and Cooling Systems

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N55 Engine
Fuel Injection
The high pressure fuel injection system (HDE) is used on the N55 engine. In contrast to
high precision injection (HPI), HDE uses solenoid fuel injectors with multi-hole nozzles.
The following overview shows the complete fuel injection system. The system is similar
to the N54 fuel injection. Although the same high pressure pump, pressure sensor, and
fuel rail are used, the high pressure fuel injection valves are new. The HDE system uses
Bosch high pressure solenoid type fuel injection valves with the designation HDEV5.2.
N55, overview of high pressure fuel injection system
Index Explanation
1
High pressure line
2
Rail
3
High pressure line
4
Fuel rail pressure sensor
5
Solenoid valve fuel injector