Rolls-H~lvce Silver Shadow
19
Bentfey
T
Series
Workshop
Manual
Purge line restrictor-To remove
1. Hold the restrictor. firmly and slide the rubber
hosing from both ends.
Purge line restrictor-To fit
Fit the restrictor by reversing the procedure described
for removal, noting the following point.
1. Ensure that the purge line restrictor is fitted into
the line correctly. This can be determined by compar-
ing the diameters of the restrictor ends with those of
the rubber hoses.
Weakener line
The weakener line connects the weakener unit on the
float chamber with the evaporation loss control
canister (see
Fig.
K39). With the engine running under
light throttle opening a depression is created in this
line, so allowing air to pass from the canister to the
weakener unit.
A
filter incorporated in the line prevents blockage
of the weakener unit.
During 'hot
soak' conditions fuel vapour can pass
along this pipe from the float chamber to be stored in
the carbon filled canister.
Weakener filter-To remove
(see
Fig.
K41)
1. Remove the steel clips (if fitted) from the inlet and
outlet hoses using special pliers
(RH8090).
2.
Slacken the worm drive clip which retains the
weakener filter to the bracket.
3.
Withdraw the filter.
Weakener filter-To fit
Fit the weakener filter by reversing the procedure given
for its removal noting the following points.
1. Ensure that the rubber hoses are in good condi-
tion.
2.
If clips have been previously fitted, ensure that
new clips are fitted.
3.
Ensure that the inlet pipe for the unit which is
off-set from the centre is facing the front of the car
and is in its lowest position (see
Fig.
K39).
Float chamber vent line
(see
Fig.
K39)
The carburetter float chambers
are vented to the
evaporation loss control canister through the float
chamber vent line. Incorporated in the line is a
non-
return valve which maintains a depression in the float
chamber during light throttle operation.
The vent valve is not serviceable and if its operation
is suspect a new vent
va!ve should be fitted.
Chapter
K
Float chamber vent valve-To remove
(see
Fig.
K39)
1. Remove the rubber hose from both the inlet and
outlet connections.
2.
Slacken the worm drive clip which secures the
vent valve to its mounting bracket.
3.
Remove the vent valve.
Float chamber vent valve-To fit
Fit the vent valve by reversing the procedure given for
its removal noting the following point.
1.
Ensure that the inlet and outlet connections of
the vent valve are positioned so that the rubber hoses
can be connected.
Fuel tank assembly
The fuel tank assembly consists of the fuel tank,
expansion tank and fuel trap assembly (see
Fig.
K42).
The fuel tank is vented from three positions to a fuel
trap assembly which is mounted above the fuel filler.
One vent is from the fuel filler neck and the other two
vents from the fuel tank.
From the fuel trap, a vent line passes under the floor
of the car to the evaporation loss control canister.
Fuel tank
The fuel tank (see
Fig.
K42) is similar to that fitted to
standard cars, except that two vent pipes, 0.375 in.
(9,525 mm.) diameter, are rigidly attached to the under-
side of the fuel tank top plate. The open ends of the
vents terminate inside the tank at the front and rear.
The outer ends of the two vent pipes terminate adjacent
to the fuel filler neck.
A
5.5 Imp. pts. (3,125 litres,
6.7
U.S.
pts.) capacity
expansion tank situated within the main fuel tank
inhibits complete filling and provides additional fuel
expansion volume to contend with extreme temper-
ature conditions.
When a vehicle is being filled with fuel, automatic
cut-off could completely fill the tank leaving only the
filler neck, vent connector pipes and fuel trap to
accommodate the expansion of the fuel. The expansion
tank is situated in the upper part of the fuel tank and
as the fuel level rises above the lower part of the
expansion tank it flows inside through the two small
holes in the base. Two additional holes in the top of
the expansion tank will also admit fuel if the level rises
above the top of the tank.
At normal rates of filling it takes approximately 3
minutes to fill an empty tank whereas it takes approxi-
mately
9
minutes for the levels in both the main and
expansion tanks to stabilise. After this time the main
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