Introduction Of The New E-Class Coupé, Model Series - Mercedes-Benz E-Class Series 207 Service Manual

Fuel system
Breathing
The fuel tank breathes via three roll-over valves. The
USA version includes features for on-board diag-
nosis.
The ECE version has a pressure hold function for
shutoff when filling and a fluid trap on the fuel tank.
The USA version also contains a tank pressure
sensor, a bubble extraction container and a filling
shutoff valve which ensures that the fuel tank is
pressureless.
In gasoline engines the breather system is
connected to an activated charcoal filter, which is
located in the right wheel well. From the activated
charcoal filter the hydrocarbon deposits are
directed to the engine intake manifold via an elec-
trically controlled purge valve in the engine
compartment. In this way the activated charcoal
filter is flushed in defined purging phases.
The fuel system in diesel engines features a
breather system without pressure holding valve, but
with a filling shutoff nipple and a roll-over valve.
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Introduction of the New E-Class Coupé, Model Series 207
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– This printout will not be recorded by the update service. Status: 01 / 2009 –