1.6.2 Fuel system, engine codes CPYA, CPYB, CPYC, CPYD, CPYE
1 - Fuel tank
2 - Fuel filter
q
With pre-heating
valve.
q
Assembly overview
- fuel filter
3 - Supplementary fuel
pump -V393-
q
Removing and in-
stalling
q
Checking
4 - Filter strainer
5 - Fuel temperature
sender -G81-
q
Checking
6 - High-pressure pump
q
After renewing, a
first fuel filling must
be performed (never
allow the pump to
run while it is still
empty)
q
Removing and in-
stalling
7 - Fuel metering valve
-N290-
q
Must not be re-
moved.
q
Checking
8 - Fuel pressure regulating valve -N276-
q
Checking fuel pressure regulating valve
q
Checking return flow rate
q
.
9 - Fuel rail
10 - Fuel pressure sender -G247-
q
.
q
Checking
11 - Pressure retention valve
q
The pressure retention valve maintains a residual pressure (for control purposes) of approx. 10 bar in
the return lines.
q
This residual pressure is required for the control function of the piezo injectors.
q
The pressure retention valve may only be renewed together with the fuel return lines.
q
After replacement, engine must be run at idling speed for approx. 2 minutes to bleed fuel system.
q
Check pressure retention valve
Industriemotoren - Industrial Engines 2009
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Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
3
1 Repairing diesel direct injection system
361