fuel pressure AUDI A8 2003 D3 / 2.G Technical Features Manual

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Engine, Mechanics
Such pipe routing prevents dry running of a
pump in critical driving situations such as
cornering or if the vehicle is at an extreme
angle.
The return pipe is shared by both reservoirs.
If one reservoir is full, the pipe is closed by a
non-return valve and the entire return volume
runs into the second reservoir.
If both reservoirs are full, the non-return
valves are overridden and the fuel runs into
the tank. Fuel system (hydraulics)
When the ignition is switched on (terminal 15),
the fuel pump G23 conveys a maximum
volume to the pressure regulator at the fuel
rail to achieve short starting times.
The pump G6 also conveys fuel to the
pressure regulator and additionally into the
pipes for the two suction jet pumps in the
side tank compartments.
The suction jet pumps convey the fuel from
the side compartments "diagonally" into the
pump reservoirs.
SSP282_005
Pressure regulator
(4 bar)
Fuel pump G23 Fuel pump G6
Suction jet pump