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18
OPERATION
N° MA.IE.
14440
(]haracteristics
of
the « L.Jetronic
»
electrou/c
fuel
i#ijccticw S)Stern.
ELECTRIC
PETROL
PUMP
The petrol pump
is
of
the multi
roller-vane
typer
driven
by
an electric motor
which
is
energized
as
long
as
the
ignition is switched
on.
The
rotor, which
is
fitted
eccentrically in the pump
housing,
has metal
roller
vanes
in
grooves around the
periphery
which,
when they are
forced
outwards under the action
of
the centrifugal
force,
ensure
the system
is
sealed.
Fuel
is
drawn into the cavities whichappear in
between the roller-vanes,
and
is then forced inta
the
injection
piping.
The electric
motor
is
submerged in
fuel.
However
there is
no fire risk, since
there
is
never any combustible
mixtue in
the pump
housing.
The pump supplies
rnore
fuel than the
engine
consumes under full
bad, so
that
there
is
always sufficient
pressure in the
fuel systern, whatever
the
engine speed.
Excess fuel
fiows
back
to
the tank.
Once
the
ignition is
on,
the pump operates at the same
time
as the starter motor.
Once
the engine
is
running,
the
air flow sensor energizes
the pump.
Thanks
to
this
type
of
system,
if
an
injector is
faulty
(
leaks
)
the
cylinder in
question
cannot be flooded if one
has
ommitted to
switch
the
ignition
off.
PETROL
FILTER
(1):
A
fuel
filter,
fitted between
the pump and the
injectors, prevents
any
impurities
from
reaching
the injectors.
PETROL
PRESSURE
REGULATOR
(
2):
The fuel
pressure
is maintained
constant by the
pressure regulator.
It
comprises
a metal
housing inside
which
is
a
diaphragm.
One
side of
the
diaphragm
is
subjected
to
the fuel
under pressure,
and the
other side is
subjected
to the action
of
a calibrated
spring.
When the
fuel
pressure
is in
excess
of
2 bars
(
29
psi
),
th
diaphragm
lif
ts
and allows
fuel
to fbow
back
to the
tank.
The pressure
provided by the
regulator
is
pre-adjusted
at the factory.
The
chamber
on the
side of
the
spring
is
connected via a flexible
pipe to the
inlet
manifold.
Therefore, the
difference
between
the
pressure
in
the
inlet
manifold and that
of the fuel
is maintained
constant.
For any engine
bad,
the drop
in
pressure
at the
injectors
is therefore
the same.
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