DIAGNOSIS OF FAULTS IN THE F TYPE SOLEX (Page 32)
While the carburettor plays a considerable part in the question of starting, there are also other factors which have a bearing thereon,
especially when starting from cold and these should be examined on the following lines:-
TROUBLES DUE TO SUCTION OPERATED AUXILIARY TANKS
A great many motors are now provided with devices of this description that can frequently cause troubles for which carburation is blamed.
1) Any leakage of air into the suction pipe can cause difficult starting and bad slow running
2) It occasionally happens that owing to a defective valve in the suction system neat petrol can be drawn into the manifold and when
this occurs the consumption can easily be excessive without any apparent carburation cause.
3) When driving fast up a long hill which requires full throttle, starvation can be caused by there being insufficient depression at the full
throttle position to draw fuel from the main tank into the auxiliary reservoir. In order to confirm this as a possible cause, remove the suction
pipe temporarily, block up the induction pipe nipple and treat the apparatus as a test tank.
If the troubles are not reproduced while petrol remains therein, the carburettor has obviously had no part in the original cause. In such a
case it is well to apply to the makers of the apparatus.
TROUBLES CAUSED BY AIR FILTERS
An air filter with too small a section of filtering medium will frequently raise the consumption owing to the increased vacuum imposed on the
main jet thereby. If this is suspected, make a comparative test with the air filter removed. Should the cause be located here, first clean
carefully the filtering medium and try again, but if the consumption is still bad it is probably the result of the filter itself being too small.
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