lter through a pipe equipped with a lter
that prevents foreign particles from enter-
ing the system.
The ller neck is suitably- sized in order
to allow inserting only unleaded fuel ller
nozzles.
The fuel is aspirated by the two submerged
electric pumps in the tank, that are
controlled by the ignition-injection ECUs.
The fuel pressure in the delivery line is
kept constant by a pressure regulator,
incorporated in the pump ange.
The tanks are tted, on the upper section,
with ventilation valves (low vapour
bleeding type). These valves are connected
to a separator which collects and condenses
the fuel vapours.
After passing through the lters inside the
pumps, the pressurised fuel is sent to the
injector rails on the intake manifolds. This
is a “returnless” type system, i.e. no fuel is
returned to the tank.
The system is tted with an automatic safety
inertia switch positioned in the passenger
compartment, which, in the event of a
collision, deactivates the fuel pump relays.
The system is designed to prevent
atmospheric pollution caused by fuel
system evaporation.
The fuel vapours coming from the tank are
conveyed to the active carbon lter where
they are absorbed and retained.
With the engine running and depending
on the driving conditions, the Motronic
ECUs control the canister purge solenoid
valves so that the fuel vapours retained by
the carbon lter are drawn in by the intake
manifolds through the specic lines.
Ambient air is taken into the active carbon
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