Rolls-Hoye Silver Shadow
19
Bentley
T
Series
Workshop
Manual
Chapter
K
Section
K6
FUEL EVAPORATION EMISSION CONTROL
SYSTEM
Cars from Car Serial Number SRX
9001
onwards built
to comply
with
American Federal Safety Standards
requirements.
In order to comply with regulations governing the
emission of fuel vapour, an efficient Fuel Evaporation
Emission Control System has beendesigned andisfitted
to cars from Car Serial Number
SRX
9001 destined for
the U.S.A. and Canada.
The Fuel Evaporation Emission Control System
eliminates direct venting of the fuel tank and
car-
buretters, thus preventing the release of unburnt
hydrocarbons into the atmosphere.
Fuel vapours are collected from the fuel tank and
carburetters and stored in a charcoal filled canister.
The canister is purged whenever the engine is running
and the stored fuel vapours are extracted from the
charcoal and burnt in the engine.
A
diagrammatic illustration of the system can be
seen in Figure
K37.
The engine compartment components are clearly
shown in Figure
K39
and the fuel tank components in
Figure
K42.
Fuel evaporation loss control canister
(see
Fiy.
K38J
The large centre section of the canister contains
approximately
775
grammes of dust free activated
carbon type
BPX
8x20
and accommodates nylon filter
-
-
connectors which connect the canister to the various
fuel vapour emission sources on the car
(i.e. the car-
buretter weakener unit, float chamber vent and fuel
tank vent).
The function of the activated carbon is to absorb and
retain fuel vapour from the carburetter float chambers
and fuel tank.
At either end of this section of the canister are thin
2
discs of polyurethane filter.
3
The lower compartment of the canister is the purge
6
chamber and is connected via the purge line filter and
*
line restrictor, to the engine induction system. It is
0
'
operative whenever the engine is running, and its func-
FIG.
K38
FUEL EVAPORATION LOSS CONTROL
CANISTER
1
Weakener connection
2
Polyurethane filter
3
Carbon
4
Float chamber vent connection
5
Fuel tank vent connection
6
Purge line connection
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