General Description; Fuel Injection System Description; Fuel Feed (Pump, Accumulator, Filter) - Lotus TURBO ESPRIT Service Manual

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SECTION L D
Page
5
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GENERAL
DESCRIPTION
Two fuel tanks are fitted, one ahead of each rear wheelarch.
A
separate f i l l e r
neck with lockable cap i s provided for each tank, and the two tanks are inter-
connected by a large bore balance pipe.
A
single sender u n i t for the fuel gauge
i s fitted into the top o f the
RH
tank.
Fuel i s fed from the
R H
tank through a n integral strainer to the fuel pumps and
injection system, w i t h excess fuel being returned into the top of the RH tank.
F i l l i n g of the fuel tanksis best achieved by twisting the pump nozzle 45O to allow
i t to be iraerted f u l l y around the bend i n the f i l l e r ne&
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LD. 2.
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FUEL INJECTION SYSTEM DESCRIPTION
Lotus fuel injection engines use a Bosch K-Jetronic system to provide an optimum
air-fuel mixture under a l l operating conditions. The sptem i s based on the principle
of continuous injection of fuel into the intake port of each cylinder, and derives i t s
designation
'K'
from the German word for 'continuous'. The fuel injection m y be
.
said to opemte mechanically, w i t h the quantity o f fuel delivered being regulated by
the amount of a i r drawn i n b y the engine.
The basic system i s regulated to provide the correct air/fuel ratio for normal running
conditiom, and f u l l power running. Various supplementary devices are used to modify
this ratio to achieve efficient overall performance when cold, decelerating, starting,
idling, operation a t high altitude etc.
A n oxygen sensor i n the exhaust system i s used to determine the mixture strength
being supplied to the engine, andan electronic control unit makes corrections
accordingly
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LD.
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FUEL FEED
T h e fuel feed system comprises the fuel pumps, fuel accumulator, and fuel filter.
A l l
fhese components are fitted a t the RH front underside o f the engine bay.
Fuel Pumps Two fuel pumps, corrnected i n series, draw fuel from the RH petrol
tank and supply i t via the fuel accumulator and filter to the fuel distributor.
Both pumps are fitted withmon-return valves i n their outlet connections,
5
Electric Fuel Pump
1 .
Fuel Intake
2.
Excess Pressure Valve
3.
Roller-Cell Pump
4.
Electric Motor Armature
5. Non-Return Valve
6.
Fuel Outlet