Fuel Low Pressure Circuit; Fuel High>Pressure Circuit - Mercedes-Benz OM 471 Introduction Into Service Manual

Functions

Fuel low pressure circuit

The fuel low>pressure circuit essentially consists of the following
components:
• Fuel tank
• Fuel filter module with water separator (1), fuel prefilter (2)
and fuel filter (3), in which the fuel is cleaned in several
stages
• Fuel pump which is located at the fuel high pressure pump
(4)
Fuel feed lines, intake side (A)
•
• Fuel feed lines, thrust side (B)
• Fuel return lines (D), via which the diverted quantity of the
solenoid valves at the nozzle needles and the diverted
quantity of the solenoid valves at the pressure boosters is
returned to the fuel low>pressure circuit
• Fuel temperature sensor (B602)
Fuel filter module pressure sensor (B638)
•
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Fuel high>pressure circuit
The fuel high>pressure circuit of the APCRS consists of the
following components:
Fuel system high pressure pump (4), which delivers the fuel
•
into the rail (6) and compresses it to about 900 bar
• Rail (6)
Pressure limiting valve (8), which is closed during normal
•
operation and only opens if the maximum rail pressure of
1100 bar is exceeded (limp home mode)
• Rail pressure sensor (B622)
Cylinder 1 fuel injector (Y608)
•
• Cylinder 2 fuel injector (Y609)
• Cylinder 3 fuel injector (Y610)
• Cylinder 4 fuel injector (Y611)
Cylinder 5 fuel injector (Y612)
•
• Cylinder 6 fuel injector (Y613)
• Quantity control valve (Y642)
Fuel high>pressure lines (C)
•
Fuel low pressure circuit function
Fuel high pressure circuit function
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– This printout will not be recorded by the update service. Status: 09 / 2011 –
With code (M5Z) Engine version Euro VI, the following
components are also present:
• Fuel pressure sensor (inlet) (B625)
• Fuel pressure sensor (outlet) (B626)
Fuel metering valve (Y628)
•
• Fuel shutoff valve (Y629)
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Vehicles with code (M5R) Engine version
EEV and vehicles with code (M5Y) Engine
version Euro V
Vehicles with code (M5Z) Engine version
Euro VI
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