through the bottom, after which a clean rag can b'e drawn through
thae bore of the pump. Note when assembling the plunger of the
pump that thse valve
(E)
is on top.
If the above is found to be in order
2.
First of all remove the top cap (V) from the pump to see
if
the float
charnb,er contains petrol. If it does then the trouble is not due to
the pump.
3.
If
the pump continues to make a pumping nois'e without delivering
petrol,
it
is due to one of the following causes
:-
(a) 1,ack of petrol in the tank.
(b) Air leak, which may be due to
(1)
a bad joint between the filter bowl (U) and the casing, in
which event tightening up will generally correct.
If
it does not
do so a new washer will have to be fitted
or
(2) a loose petrol union in the suction pipe, that is to say any
point between the bottom union of the pump and the petrol tank.
The washer between the filter bowl and its bolt
(T)
should also
be inspected.
(C)
Foot Valve
(F)
held up.
This is a very rare source of trouble.
To rectify remove the filter bowl (U), Filter
(H)
and foot valve
(Y) by means of a tommy bar through one of the holes. The
foot valve can then be cleaned. A second filter
(X)
will be found
in the foot valve underneath the priming tube.
4.
If the pump works very slowly without delivering petrol, it is due to
(a) Blocked petrol pipe or filters, in which case the filters or pipe
must be cleaned out.
(b) Ratteries run down, in which case
fill
the float chamber of the
pump with petrol. This will probably 'enable the engine to be
started up by hand, and as the dynamo comes into action it will
boost up the batteries sufficiently to run the pump.
5.
Should the pump not work at all, providing the plunger has not
stuck, the trouble will be due to
(a) A bad electrical connection.
'To test this remove the terminal
from the pump and flash the wire across the pump body.
If
there is a bright flash this is in order.
If not, the trouble is due
to the batteries being run down or bad connections somewhere
in the system.
The electrical apparatus is to all intents and purposes absolutely fool
proof.
Practically the only thing that can cause this to cease to function
is a broken wire.
If
reference is made to the diagram the connections will
be seen exactly.
To gain access to the electrical part of the pump it will be
nsecessary to remove Filter Bowl
(U),
foot valve (Y), unscrew the large
hexagon nut
(W)
holding the inlet ring, when thse casing can be drawn off
and the internal parts of the electrical equipment and connections inspected.
Care must b,e taken to see that the cork gland washer which makes a petrol
tight joint between the inlet ring and electrical equipment is in perfect
condition.
A new cork gland washer is advisable.
D11
PAGE
FIFTY-FIVE
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