FORD MODEL A
FUEL SYSTEM
Gasoline Tank
The gasoline is carried in a ten-gallon tank welded integral
with the cowl
of the car. From this tank the gasoline flows by
gravity to the carburetor, where it is mixed with air and drawn
into the cylinders by piston suction.
A sediment bulb located on the engine side of the dash, is
i:,rovided for draining off water or sediment that may have
accumulated in the tank. Occasionally draining the bulb pre-
vents foreign material being drawn into the carburetor.
The Carburetor
The quanti y of gasoline entering into the carburetor is
governed by the float. The volume of gas mixture entering the
intake manifold is controlled by opening and closing the
throttle, according o the speed desired by the driver. Since,
with the exception of the needle valve and idle adjus ment all
of the carburetor adjustments are fixed, about the only thing
that could affect
the carburetor would be dirt or water getting
into it. An occasional cleaning will insure unin errupted ser•
vice. To clean the carburetor, remove the filter screen and thor-
oughly clean the screen by washing it in gasoline. The screen
is easily removed by backing out the filter plug (see Fig. 12).
l t is also a good plan to occasionally remove the drain plug at
the bottom of the carburetor and drain the carburetor for a few
secoAds.
Regulating Gasoline Mirture
For economical driving, reduce the quantity of gasoline in the
mixture y turning the adjusting rod to the right as far as
possible without affecting the operation of the engine. This is
particularly true when taking long drives where conditions
permit a fair rate of speed being maintained, and accounts for
the excellent gasoline mileage obtained by good drivers.
Turning the carburetor adjustment too far to lhe left results
in a 'rich mix ure." Such a mixture has too much gasoline and
should be used for starting and warming up only. Running with
too rich a mixture causes excessive carbon and overheating,
likewise i wastes fuel.
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