Engine Mechanics
32
Overall Schematic Diagram
The
Electrical Fuel Pumps
work as preliminary
transport pumps, pumping fuel to the fuel filter
unit.
The
Check Valves
prevent fuel in the fuel
manifold and the preliminary run line from
flowing back into the fuel tank when the engine
is at a standstill.
The
Fuel Filter Unit
protects the injection
system from excessive wear by removing dirt
and water.
The
Fuel Pumps
transport the fuel out of the
fuel filter unit and pump it at high pressure into
the preliminary run of the fuel rails.
The
Pressure Control Valves
regulate the fuel
pressure in the fuel preliminary run to
approximately 8.5 bar.
The
Pressure Relief Valves
limit the fuel
pressure in the fuel return flow to approximately
1 bar. As a result, the pressure conditions in the
fuel system are balanced.
The
Fuel Temperature Sensors
are used to
record the fuel temperature for the ECMs.
The
Preheating Valve
guides the fuel in the
return flow into the fuel filter unit when the
outside temperature is low, thus preventing
clogging of the filter inserts.
The
Fuel Cooler
cools the fuel in the return flow
to protect the fuel tank from fuel that is too hot.
Preheating Valve
Fuel Return
Pressure Relief Valve
Fuel
Temperature
Sensor
Pressure Control
Valve
Fuel Pump
Fuel Pump
Pressure Control
Valve
Check Valve
Check Valve
Fuel Filter
Unit
Fuel Temperature
Sensor
Fuel Return
Pressure Relief
Valve
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