How To Drive A Motorcar
A Key To The Subtleties Of Motoring
År: 1915
Forlag: Temple Press Ltd.
Sted: London
Udgave: 2
Sider: 138
UDK: 629.113 How
Written and illustrated by the Staff of "The Motor"
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HOW TO DRIVE A MOTORCAR
How Trouble may be Hidden
One of the most extraordinary cases of trouble in
locating a shortage of petrol supply to the carburetter
which has ever come under the writer’s notice was due
to some graphite which had found its way into the little
air vent of the cap of the petrol tank, which, of course,
was a gravity-fed one. This had hardened, and as the
cap was provided with a good washer the tank had thus
become air-tight, so that when a certain quantity of
petrol had flowed out the partial vacuum in the tank
arrested further flow. All the various defects pre-
viously alluded to had been carefully gone through by
the driver, and he and his assistant were naturally sure
of a ready flow of petrol when the copper pipe itself
from the tank to the carburetter had been finally proved
to be free. They were greatly astonished when, on
turning on the petrol once again, it was found that the
flow of spirit was still in some extraordinary way much
too slow and insufficient for the needs of the engine.
As a final resource the then-unknown-to-be faulty
cap of the tank was removed to make certain that the
petrol, which was known to have been in the tank, had
not been stolen. All was found to be well, and on try-
ing once more the flow of petrol was suddenly found to
be restored to its normal conditions. The coincidence
set the driver and other folk thinking, and then the
solution of the problem was quickly found. This fact
is not mentioned as a matter in any way likely to crop
up, but it serves its purpose in pointing out that, if one
finds the flow of petrol is not free, it is not always suffi-
cient merely to cleanse the filter.
[For ordinary starting-up purposes in those cars
in which it is necessary to flood the carburetter, it
is well to remember that slight flooding usually
produces easier starting than excessive flooding;
obviously, also, it is less wasteful, so that the
point should be remembered. If it is found that
the engine still refuses, then it is safe to assume
that the trouble is due to ignition rather than to
the question of carburation.]
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