--~-----_~------THE
FUEL SYSTEM B
It Is as well
to
let
the
pump run for
ten
minutes
or
so before carrying
out
these
various
tests.
The
cover,
which is black
for
12-volt and
brown
for
&ovolt,
should
then
be fitted and held In place with an
ordinary
brass
nut
and an insulated
dome
nut
fitted on
the
end
2. To press firmly
and steadily on
the
armature.
Instead of Jerking It, while obtaining
the
setting.
3. Omission
to
stretch
the
diaphragm
to
the
limit
of Its
stroke
while tightening up
the
body
screws.
3
fEET
GLASS
TUBE.
SeetiOD
8.6
TRACING FUEL PUMP TROUBLES
TAP Should
the
pump cease
to
function, flrst disconnect
~~...---
the
fuel delivery pipe from
the
pump. If
the
pump
then
works
the
most likely cause of
the
trouble
Is a
sticking needle In
the
float-chamber of
the
carbu
retter.
Should
the
pump
not
work,
disconnect
the
lead from
the
terminal and
strike
It against
the
body of
the
pump
after
switchIng 0 n
the
Ignition. Ifa
spark
occurs
2.
It Indicates
that
the
necessary
current
15
available at
the
Fig. B.8.
This
illustration shows the method of cleaning
the
. fuel pump contact points.
,..:.
.
Fig. B.7.
The checkinC ric. This can usually be
constructed
from
Items
anllable
locally,
but
the
complete rig Is obta.lnable
from the Service
Paru
Departmentof The M.G. Car Co. Ltd.
or
your
local
Distributor.
of
the
terminal.
The voltage of
the
pump can always
be Identified by
the
colour of
the
sleeving on
the
coil
ends, this being red
for
12-volt and green for
&ovolt.
Note.-There
are three important pOints which are
repeatedly
overlooked
by operators.
These
seriously
affect the functioning ofthe
pump;
they are
;-
I. To keep
the
contact
breaker
blade
out
of con-
tact
while obtaining
the
correct
diaphragm
setting.
terminals and
that
the
trouble
arIses with
the
pump
mechanism. If no
spark
can be
detected,
then
It
15
an
indication
that
the
current
supply has failed and
that
attention
should be given
to
the
wiring and
battery.
If
current
is present,
further
investigation should be
carried
out
by removing
the
bakelite cover which Is
retained by
the
terminal nut. Touch
the
terminal
with
the
lead. If
the
pump
does
not
operate
and
the
contact
points
are
in
contact
yet
no
spark
can be
struck
off
the
terminal, It is very probable
that
the
contact
points
are
dirty
and
require
cleaning.
These
may be
cleaned by InsertIng a piece of card
between
them,
pinching
them
together
and sliding
the
card backwards
and forwards.
If,
when
the
wIre is connected
to
the
terminal and
the
tickler
of
the
carburetter
Is depressed,
the
points
8.7
Wishvilles Classic
Automobile Library
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