FUEL
SYSTEM
(b)
Fit the tap into the fork bracket so
that the feed to the pump is upper-
most. The two flats on the tap body
will assist in locating its position.
Secure the tap to bracket by tightening
the jam nut.
(c) Position the rigid petrol feed pipe
from tank into lower portion of tap
and ensure that the olive is seated
before the union nut is attached and
tightened.
(d) Attach the flexible hose from pump to
outlet connection of the tap and
secure to give
a
petrol tight joint.
(e) Fill petrol tank, open tap and prime
pump by hand until the carburettor
chambers are full.
15. TO ASSEMBLE PETROL STOP TAP
(a) Fit the cork seal on to the centre rod
and screw the rod into the plunger
head sufficiently to just nip the seal.
Attach the lock nut to the centre rod
protruding through the head of the
plunger.
(b) Smear the cork and the inside of the
tap body with a little oil or grease.
(c) Carefully feed the plunger into the
tap body so that .the groove in the
plunger aligns with the round headed
screw in the exterior of the body.
(d) Tighten the body screw so that the
plunger is located in the tap body
and has freedom of movement.
(f) Start the engine and allow it to run
(e)
Adjust the interference of the plunger
for a short time while inspecting the
to ensure that petrol will not seep
connections for leaks.
past the cork seal.
This is effected by
turning the centre rod of the plunger
anti-clockwise to increase or clockwise
13. SERVICING
THE
PETROL STOP
to decrease the interference.
TAP
In practice the tap will require little atten-
(f) Lock the centre rod with the lock nut
tion apart. from a periodical inspection to
in the head of the plunger.
ensure that it is leak proof.
The tap has
a
cork plunger which can be
16.
AC
FUEL
PUMP
TYPE
cc
UE
,,
expanded to increase the interference and
so improve the seal. Description
(Fig.
3)
The cork is expanded by loosening the
lock nut at the top of the plunger and the
centre rod in an anti-clockwise direction,
retighten the
locknut.
It
will be noticed
that increased resistance is felt when the tap
is operated.
14.
TO DISMANTLE PETROL STOP TAP
(a) Loosen the round headed screw at the
side of the tap body sufficiently to allow
the plunger to be withdrawn.
(b) Remove the lock nut in the head of the
plunger.
By turning the cork it
can
be
removed together
with
the centre rod.
(c) The cork
can
now be pushed
off
the
centre rod.
(d) Clean and inspect
all
parts and renew
any that are believed to be defective.
The AC fuel pump, type
"
UE
",
is
operated mechanically from an eccentric
(H)
on the engine camshaft (G). The
illustration gives a sectional view of the
pump, the method of operation is as
follows
:-
As the engine camshaft (G) revolves, the
cam
(H)
lifts pump rocker arm
(D)
pivoted
at
(E)
which pulls the pull rod
(F)
together
with the diaphragm (A) downward against
spring pressure (C) thus creating a vacuum
in the pump chamber (M).
Petrol is drawn from the tank and enters
at
(J)
into sediment chamber
(K)
through
filter gauze
(L),
suction valve
(N)
into the
pump chamber (M). On the return stroke
the spring pressure (C) pushes the dia-
phragm (A) upwards, forcing petrol from
the pump chamber (M) through the
delvery
valve
(0)
and outlet
(P)
to the carburettor
feed pipe.
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