Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual, Page: 98 / 413

Page 12
S U[N BEAM Section C (Fuel System)
valve. The latter is only used on WIA carburettors.
The float chamber is vented to atmosphere by a
hole entering adjacent to the accelerator pump
lever spindle.
Starting from cold (See Fig. 7)
Cold starting conditions require a very rich fuel/air
mixture for a few seconds, and weaker but not
normal mixture, until the induction manifold begins
to warm up. Correct throttle opening is also
important.
These requirements are met by the manually
operated strangler butterfly valve closing off the
air supply, and the strangler valve operating
STRANGLER VALVE
SPRING
FLOAT
FLOAT NEEDLE
SEATING
FLOAT NEEDLE
mechanism opening the throttle to the correct
starting position, when the choke control is pulled
out to start the engine.
When starting under cold conditions, the choke
(strangler) control is pulled out as far as possible,
the ignition switched on and the starter operated.
After the engine starts and when it begins to run
erratically (or "hunt") the choke control should be
pushed in far enough to give smooth running again.
The choke control should be pushed in fully as soon
as possible without causing the engine to misfire
or stop.
The choke (strangler) butterfly valve has unequal
areas each side of its pivot spindle and the valve
STRANGLER VALVE
CLOSED
THROTTLE VALVE-HELO IN
POSITION BY STRANGLER
OPERATING MECHANISM
- FUEL
Fig. 7.
Cold starting operation