Fuel, Exhaust & Engine Electrics
Page 2.12
Fuel High Pressure System in DFI Engines
The fuel high pressure system generates an injection pressure of up to
1740 psi (120 bar) in the combustion chamber. The components of the
V6 engine and the V8 engines are different.
The following pages describe the functions of the components of
the V6 DFI engine first, and then those of the V8 DFI engines.
Safety
Always read and follow the safety instructions in the Technical Manual,
Group 2 when working on the fuel supply system.
V6 DFI Engine
The fuel high pressure system in the V6 DFI engine is made up of the
following parts/components.
Fuel High Pressure Pump
The fuel high pressure pump creates a high pressure of up to 1740 psi
(120 bar), which is required for injection. It is controlled by demand and
adapts the fuel quantity according to engine requirements via a flow
control valve. This piston pump with one piston is located on the
cylinder head. The high pressure pump is driven by the timing chain via
a double-cam gear wheel. The double-cam gear wheel uses a roller to
actuate the pump piston, which creates the fuel high pressure in the
pump.
C - Fuel high pressure pump with flow control valve
G - DS Fuel pressure sensor
A - Low pressure (approx. 80 psi/5.5 bar from
the fuel tank)
B - Camshaft
C - Fuel high pressure pump
D - Flow control valve (for fuel high pressure)
E - High pressure line
F - Pressure control valve (max. 1740 psi/120
bar)
G - Fuel pressure sensor
1, 3, 5 - Fuel injectors on high pressure rail,
bank 1
2, 4, 6 - Fuel injectors on high pressure rail,
bank 2
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