BTHE FUEL
SYSTEM~---------------
faU
to
break,
it is possible
that
there
is
either
an
obstruction
in
the
suction
pipe, which should be
cleared by blowing it
through
with
air,
or
some
Irregularity
in
the
pu mp itself is
preventing
the
correct
movement.
This may be
due
either
to
the
diaphragm
havlng stiffened,
or
to
foreign
matter
in
the
roller
assembly which
supports
the
diaphragm, in which
case
the
diaphragm
should
be
removed
and
the
whole
assembly cleaned and reassembled In
accordance
with
the
instructions
in Section
B.4.
On
the
other
hand, if
the
points
are
not
making
contact,
see
that
the
tips
of
the
inner
rocker
(25)
are
in
contact
with
the
magnet
housing. If
they
are
not
it Is an indication
that
the
armature
has failed
to
return
to
the
end
of
its
normal
travel.
To
cure
this,
loosen
the
six
screws
which
attach
the
magnet
housing
to
the
pump
body, and
make
sure
that
the
diaphragm Is
not
sticking
to
the
face
of
the
magnet
housing by carefully passing a penknife
between
the
two,
The
hinge pin
(19)
should
then
be
removed
and
the
six
retaining
screws
tightened
up again
Fig. B.9.
The fuel pump filter removed for inspection.
The
tips
of
the
inner
rockers
will
probably
now
be
found
to
be making
contact
with
the
face
of
the
magnet
housing,
but
if
they
are
not
it will be necessary
to
remove
and dismantle
the
whole
magnet
assembly
in
order
to
ascertain
if an accumulation
of
foreign
matter
has caused a jam.
Remember
that
whenever
the
magnet
housing is
removed,
care
should be
taken
to
see
that
the
guide
rollers
(10) do
not
drop
out.
Pump
noisy
If
the
pump
becomes noisy and
works
rapidly, it is
usually an ind
lcatlon
that
there
is an alr leak 0 n
the
suction
side
of
the
pump.
Check
the
level
of
the
fuel in
the
tank
and
see
that
it is
not
too
low.
8,8
The
simplest
way
to
test
for
air
leakage is
to
dis-
connect
the
fuel
pipe
from
the
carburetter
and
place its
end
in a glass Jar
(approximately
I
pint
or
half a
litre)
and allow
the
pump
to
deliver
petrol
Into
it. If air
bubbles
appear
when
the
end of
the
pipe has
become
submerged
in
the
fuel it is a
clear
indication
of an air leak on
the
suction
side of
the
pump
in
the
fuel feed pipe
between
the
tank
and
the
pump,
which should be found and
cured.
Check
all
the
unions and Joints, making su re
that
the
filter
union
and
inlet
unions
are
all
quite
air-tight.
Failure
to deliver fuel
Should
the
pump
continue
beating
without
deliver-
ing fuel, it is
probable
that
some
dirt
has
become
lodged
under
one
of
the
valves, In which case
they
should
be
dismantled
by unscrewing
the
top
or
delivery union and lifting
out
the
valve cage,
when
they
can be cleaned
and
reassembled.
When
replacing
it see
that
the
thin
hard
red
fibre
washer
is
below
the
valve cage and
the
thick
orange
one
above.
If
the
pump
struggles
to
pump
and
becomes
very
hot, It is
probable
that
the
filter has
become
clogged
or
there
is an
obstruction
on
the
suction
side.
The
filter
is readily
removed
for
deaning
by unscrewlng
its
retaining
plug at
the
bottom
of
the
pump.
Section
8.7
FUEL
PUMP
MAINTENANCE
Apart
from
keeping
the
contacts
clean and
removing
the
filter
at
regular
intervals
every
6,000 miles
(10000
km.)
for cIeani ng,
the
re
Is no mai
nte
nance
required
on
the
fuel
pump.
Wishvilles Classic
Automobile Library
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