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EMISSION AND EVAPORATIVE CONTROL SYSTEM
The method of achieving a cut off is by applying a slight
'vacuum' to the float chamber of the carburetters when the
ignition is switched off.
System Description
With the ignition off a solenoid is activated which operates a
valve that seals off the inlet to the bottom of the canister. With
the inlet sealed a connection to the intake manifold applies a
partial vacuum to the canister and consequently to the float
chamber via an interconnecting pipe. The vacuum thus applied
is sufficient to prevent fuel being drawn into the engine. When
the engine has stopped and the oil pressure drops to zero, the
solenoid is deactivated and the engine is thus ready again for
operation.
Servicing
The system requires no servicing other than checking for
deterioration and leak free connection of the system piping.
Function Checks
If the system is not working then it will be apparent by
engine running-on. A system check can be made by applying
current to the solenoid which, if working correctly, will stop the
engine.
Fig.
1
Crankcase and Canister Purge System
Crankcase purge line
8
Electrical connections for
Carburetter float chamber vent
anti run-on valve
pipe
9
Purge air to canister
Canister purge line
10
Flame arrestor
4
Charcoal canister
5
Fuel tank vent pipe
A &in. restrictor
6
Anti run-on valve
B
&in. restrictor
7
Manifold vacuum line
C *in. restrictor
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