Bentley R Type - Electric Fuel Pumps and Gauge; De-misting Equipment

Tnr
ErBcrRrcAL
Sysrru.
Electrio
Fuel Pumps and
Gauge,
The
electric
fuel
pumps
should
not
need
any
attention
over
long
periods
of running, except,
perhaps,
the cleaning
of
the
suction
oi
delivery
vllv-es (see_
page
46);
it
an
electrical
fault
is
suspected,
it
is
recommended
that
the
necessary
inspection
and
any
work
in
connection
yitlt
repairs slould
be
carried
ogt._by
Messrs.
Bentley
Motors
(r93r)
Ltd.,
or one
of
their
"Special
Retailers".
Reference to
the wiring
diagram (Fig, 4o),
will
show
that
they
are
supplied with current
through
the
ignition
switch,
and,
con-
sequently,
are
only operative
when
the ignition
switch is
closed.
The
fuel gauge is
divided
into
two
parts:-
(a)
An-indicating
instrument,
mounted
on
the
instrument
panel,
and
marked
"o,
t,
L, t,
and
F".
(b)
A
petrol
tank
unit, with
a float
for
measuring
the amount
of
petrol
in
the
tank.
The
indicating
instrument
has
two actuating
coils:-
r. A control
coil, which is
connected across
the battery
and
so
provides
a
constant
torque on
the
pointer,
tending to
swing
it over
to the
"Full"
side
of the scale.
z.
A deflecting
coil, which is
connected
in
series
with
the
battery
and
the tank
unit rheostat,
and so arranged
to act
in
opposition
to the
control
coil.
The tank unit
consists
of a variable
rheostat,
the sliding
arms
of
which are
operated
by
the up-and-down
movement
of the flbat,
thus
varying
the
circuit resistance
from
a
minimum
in
the empty
position
to
a
maximum
in
the full
position.
With
the float
in
the-
"empty"
position
the
current in
the
deflecting
coil
is
at
a
maximum,
anil its
turning
effort
is
of sufficient
strength to
move
the
pointer,
against
the opposilg
force
of
the control
coil, back to
the
"O"
position
on
the
indicating
instrument.
Thus
as
the resistance
is varied
by
the
position
of
the float,
the
pointer
indicates
the
petrol
level in
the
tank.
A
wlrning light
is
provided
on the instrument panel,
which
is
automatically
illuminated
when
there is approximately
three
gallons
or less
of
petrol
in
the
tank.
Electrio
Horng.
-
Twe
tune4 wind-tone
horns
are
provided,
operated
through
a sealed
relay
mounted
on
the front
of the dashboard.
-
fo
qdjustments
should be
attempted.
In the
event
of derangement,
or
deterioration
of
the tone,
Messrs. Bentley
Motors
(rgst)
Ltd., or one
of
their
'lSpecial
Retailers"
should be
consulted.
De-misting
Equipment.
Air
is taken
from
a
grille
in the front
wing through
a special heater.
fed
from
the engine
cooling system
and fittld
undir
th6 front
wing,
G
97