DV11
Operation and Maintenance
120
Common Rail Fuel-injection System
Printed in Mar. 2005 PS-MMA0608-E1A
z Fuel high pressure pipe
These fuel high pressure pipes carry the high pressure fuel of up to 1600bar.
They must therefore be able to permanently withstand the maximum system
pressure and, during the pauses in injection, the sometimes high frequency
pressure fluctuations which occur. They are therefore manufactured from the high
pressure pipe. They have an outside diameter of 8.0 mm and an internal diameter
of 3.0 mm. The fuel high pressure pipe lines between the common rail and the
injectors must all be of the same length, should be kept as short as possible.
3.4.11. Construction of the fuel high pressure pump
1) Function
The high pressure pump is the interface between the low-pressure and the high
pressure stages. Under all operating conditions, it is responsible for providing
adequate high pressure fuel throughout the vehicle's complete service life. This
also includes the provision of extra fuel as needed for rapid starting and for rapid
build-up of pressure in the rail. The high pressure pump continually generates the
system pressure as needed in the common rail.
Fuel low pressure line
Fuel high pressure valve
Pump piston
Eccentric
cam
Driving shaft
Fuel outlet
Fuel
inlet
Fuel high pressure line
Engine oil
Fuel
outlet
Fuel
inlet
Lubrication of driving shaft by
lubricating engine oil
Gear pump
Metering unit
Fill fuel at 40ml
before operating
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