Lotus TURBO ESPRIT Service Manual page 381

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Page
9
When the engine i s stopped, the fuel pump are switched off and the pressure
drop below injector opening pressure. The primary pressure regulator then
seats fully under the action of
its
spring, and prevents further pressure
reduction i n the primary system.
ii)
Fuel Control Valve
The fuel control valve i s located centrally i n the fuel distributor, and controls
the fuel delivery to the injecton relative to the air flow sensor position.
/To
1
n jec tors
Fuel Intake
The control valve slides inside
a
barrel into which i s fed fuel at primary
pressure. The fuel then flows through
4
metering slits to the distributor
differential valves and then to the fuel injecton.
As
the air flow sensor i s
deflected further by an increasing airflow, so the control valve i s raised i n
its barrel, progressively opening a larger proportion of the metering slits, and-
. .
increasing fuel flow to the injectors,
Engine Stopped
'
Part Load
.
1
Control pressure
2 Control plunger
3 Metering slit in the
barrel
4 Control edge
5 Fuel Intake
6 Barrel with metering
slits
Full Load
The Lotus fuel distributdr has metering slits with two different widths, the smaller,
stclndard section for light and part load running and the larger width for mid
to
f u l l
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power runnlng
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