Lotus Esprit Series - Page 245

FUEL SYSTEM
Page L10
Operation
The petrol inlet
is a porollel tube connecting the two corburetter~, into which a
flexible fuel pipe from the
'Flowlock' valve is fitted. Fuel passes into the flwt
chamber, via a needle valve, where the flow is controlled by the needle in the
valve and twin floats mounted on a common arm. As the fuel level rises, the
flwt
lifts and by means of the float orm and tag, closes the needle onto its seating when
the correct level has
been attained.
When the
engine is running fuel is drawn from
the
flwt chamber, the float descends and more fuel is then admitted through the
needle valve. In this manner, the correct level is automatically maintained ttie
whole of the time the carburetter is in action.
Fuel in the jet orifice
is maintained at the same level as that in the flwt chamber
by means of crass
drillings in the iet assembly.
When the choke control on the tunnel switch panel is lifted up, it operates o lever at
the side of the front corburetter; this rotates a disc in the starting device in
which a
series of holes of different diorneters are drilled. In the full rich position, all
holes
will be in communication with the storter circuit and provide the richest mixture. A
cross
- teed pipe feeds the rear corburetter. Petrol is drawn from the float chamber via
a vertical drilling adjacent to the central main feed channels, through the starting
device and into the carburetter body
between the air valve and the throttle plate.
Simultaneously, the cam on the starter lever will open the throttle beyond the normal
idle position according to the setting of the fast - idle stop screw to provide a faster
idle speed to prevent stalling when the engine
is cold.
As
ttie choke on the tunnel
switch panel
is gradually released, fewer and,'or smoller holes will provide the petrol
feed from the float chamber, thereby pro
g
ressively wec~ening the mixture strength to
the point where the choke control
is pushed fully down. Mixture is then governed by
the
Foctory setting of the main orifice and idle speed determined by the setting of the
thrortie stop screw.
ESPRIT
Issue 04/78