Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1919-04-27
sIMPl|F|EO LESSONS IN
CARE Of AUTOMOBILE
Expert Describes Gasoline Feeds and
Placing of Gasoline
Supply Tank.
VACUUM AND PRESSURE FEEDS
Manner in Which Systems Are Used.
Questions OF Automobile Owners
Answered by Gucrrlich i'll Ian
.uaSc clear To Laymcn.

Thcrc are t0o ways OF placing the
gasoline supply tank; namely; h'rnet
3 >thau the carburetOr. as under the seat
or cowi; or in the rear OF the ear.
where It Will be lower than the car
buretor.
There is practically no problem in
feeding the gasoline to the carbure-
tor when the tank is higher than IL,
aS the gasoline VIII simply flow to II
by gravity. II is, however. often ncceS-
siry to make the manifold very long.
so as to get The carbUrotor low enough,
thus i"Greasins The tendency 70 con :
dense. Sometimes when the car is GO
ing Up hill. and when the tank is
nearly empty. the carburctor Will se;
higher than the level OF the gas in
The tank. and, OF course. the gas can
not set TO the carburetor. This often
happens and. when il does. the thing
TO do is TO turn around and so up
the hill backward
Where the tank IS placed in the
rear, which is often done because of
the convenience OF Milling and because
O; The better balance Of the car which
is obtained thereby the level of the
Ouretor. There will. therefore have
10 be some means furnished for fore
ms the gas UP 20 this higher level.
work Done In Tu" Ways.
This IS done in TWO ways--namely,
Ly the pressure feed system and by
the vacuum system. The latter how
ever. is fas; replacing the former.
The Vacuum system.
Let us imagine We are inventinc
such 4 system. Suppose VIC had small
in some way drew all the air out OF
mis- tank: or in other words. created
= vacuum in it. What would happen?
Why. the gasoline. because OF the
pressure of The atmosphere would bc
forced. or. as is generally said, sucked
no through the pipe ID" from the sup
ply tank 10 the tank "E."
If the bottom or the tank had ::
pipe running from it 10 tho carburetor.
placed much lower. would the gasoline
not; as. if the gasoline was sucked up
from the supply tank because of the
Vacuum, the gasoline would also he
sucked IN from the carhurctor instead
The Problem Started
Thus. here is problem This. how
ever. at first glance. can be taken care
OF by having tho tank divided into
and having the lower open to the at
rospherc, As shown dotted in Figure
This Will permit the Gasoline to
Carhureto- but will it flow from the
upper 20 tho lower? No. not while
therc is vacuum in tho upper. SO
shall we do? Obviously the LIQUID
cannot flow from the upper to the low :
er chamber IN a constant stream. but
gould We make it flow periodically?
the upper chamber and then draw gas
oline from the supply tank until the
Chamber Is full, and then open the
chamber 10 the atmosphere. will the
gas How 20 tho lower chamber? Why
HrS.
How. then, can we cause vacuum
30 form in the upper chamber when il
Is empty and open 10 The atmosphere
when full? 7'h!S could be done by
yalyes but ,,. how can tho. valves hc
= t,.. On -,
g" Is The pipe BY which the mir
- drawn out Of the chamber and ~
Inc valve which will open and close it,
~ is pine ,open 10 the air, and
~ its valve 20" is the float Note
mat when. the float is UP the spring
is higher than tho center II OF
itc level p" thus this level will be
RULED UP and open n" and close ~ -
When The float is down the spring
M! be lower Than u" thus the level
n,en, e" viii open and "' a" s Ht5sS
FOR almost the entire downward move
nleni OF the float while IL" win n,
closed and - open for almost the
entire upward movement. y very
vltser invention.
Method Of Obtaining Vacuum.
FLOW Is the vacuum obtained? When
ne engine j. running there is n vacuum
in the inlet manifold, and so if the
PIPE C Is competed 10 the manifold
THIS vacuum VIII also form in the va.
cuum or upper ~Ilamber.
IN order ,o-prere.t the LIQUID bein.:
sucked from the lower to the uppe,
chamber a check. OF as i, is called.
Napper valve II is placed on the
tube through which the gasoline
flows.
Note tia, the mouth Of the pipe lead :
ing % The carburetur is higher than
tAe bottom Of the tank. This is TO
Is ssss'