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Lotus Service Notes Section EMN
Page 22
Push Fit Connectors
The fuel rail feed and return hoses are equipped with push fit connectors to allow easy powertrain re-
moval. The feed line connector is colour coded orange, and the return line connector green. Note that the feed
line should not be opened without first carrying out the fuel pressure relief procedure detailed above. With the
system depressurised, cut the safety tie wrap from the connector collar, and use an absorbent cloth to collect
fuel draining from the pipe before pressing the collar into the connector, and separating the joint.
Clean the pipe spigot and lubricate with a light spray of WD40 or similar before remaking the joint,
pressing firmly together until full engagement is indicated be an audible 'click'. Check security by pulling and
twisting the joint. To guard against any possibility of accidental release, fit a small tie wrap (A075W6038Z)
around the release collar as shown.
Fuel Injectors
The four fuel injectors are fitted between the pressurised fuel rail and the inlet manifold. Each injector
comprises a solenoid operated needle valve and a specially designed nozzle to ensure good fuel atomisation.
The ECM energises the injectors under engine run conditions, and provides an earth signal for the period the
injectors are required to be open (referred to as 'pulse width'), spraying fuel onto the back of the inlet valves.
Standard engines use group injection, where the fuel injectors are activated in pairs, 1 with 4 and 2 with 3,
whereas VVC engines use fully sequential injection, with each injector activated individually.
During cranking, when the engine speed is below approx. 400 rpm, the ECM increases the pulse width
(dependent on coolant temperature) to aid starting, and on VVC engines, operates the injectors in group mode.
To prevent flooding, the ECM periodically inhibits the operation of the injectors during extended cranking.
Fuel feed hose
push fit connector
(orange)
Fuel return hose
push fit connector
(green) sb29
Convolute
sleeving
Tie wrap fitted around
release collar
sb30