FUEL SYSTEM
F&.
4
Cleaning
the
Pump
Filter.
The replacement of the Nter is the reversal
of the removal. The thumb nut should be
tightened sufficiently to make a good seal,
overtightening tends to harden the seal
which then looses its sealing properties.
The hand priming pump should be used to
fdl
the sediment chamber and carburettor
float chambers. The engine should be
started and run for a few minutes so that
the pump may be observed for leaks.
TESTING WHILE
ON
ENGINE
With the engine stopped and switched off,
the pipe to the carburettor pipe should be
disconnected at the pump and replaced by
22.
a
shorter tube, leaving a free outlet from
the pump. The engine is then turned over
by hand, when there should be a well
defined spurt of petrol at every working
stroke of the pump, namely, once every two
revolutions of the engine.
TO REMOVE PETROL PUMP FROM
ENGINE
(c)
Remove the two pump securing nuts
and spring washers. Note the oil
pressure pipe clip is attached to the
rear stud.
(d)
The pump can be removed from the
cylinder block, together with the pack-
ing.
21.
TO FIT PETROL PUMP TO ENGINE
(a)
Place a new packing of correct thick-
ness on the pump attachment studs
followed by the pump. Secure with
foremost nut and lock-washer finger
tight.
(a)
Turn off at petrol stop tap and remove
the flexible hose from the tap first, then
remove the hose from the pump.
(b)
Remove fuel feed from pump to carb-
urettor at its pump connection.
(b)
Position on the rear stud the oil pressure
pipe clip, secure with nut and lock-
washer. Tighten both nuts
(c)
Attach the carburettor feed to pump
and secure with union nut taking care
to seat the pipe olive before attaching
the union nut.
(d)
Attach the flexible hose to the for-
ward end of the pump. Attach and
secure the rigid end to the petrol stop
tap.
(e)
Turn on petrol and prime pump with
hand lever, until the glass sediment
chamber and carburettor float
chambers are full.
(f)
Start and run the engine for a few
moments and examine the connections
for leaks.
TO DISMANTLE PETROL PUMP
For Notation
see
Fig
5.
(a)
Clean the exterior of the pump and
with a file mark the two flanges with
a small cut.
(b)
Loosen the thumb nut under the glass
sediment chamber
(6)
and swing the
frame
(9)
clear. The sediment chamber
can
now be lifted clear together with
cork seal
(4)
and gauze filter
(2).
(c)
The wire frame can now be lifted out
of the upper body
(1)
of the pump.
(d)
Separate the two castings
(1
and
16)
by
withdrawing the six securing screws
(12)
and lockwashers
(13).
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