Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1920-12-26
s|MPL|F|ED LESSONS IN
CARE OF THE AUTOMOBILE
Large Percentage OF C:rburctOr
Trouble Is Due to Feeding OF
Gasoline From Tank.
HY FREDERICK &. GUEItItLICIi.
AUTO LESSON NO. :"t.
%t;nsuiinr Feed rOubl

trouble is due to the feeding OF tho
gasoline from the gasoline tank TO
the carburctOr. Sometimes the gas
olinc will feed too fast. though this.
whidh is practically always due To
Il defect in he fioat valve. is not
nearly so often the case AZ is the gas
olinc feeding too slowly.
When the mixture is too lean. or
weak. that is whcn the percentage
OF gas TO air liz too small. 1t Is gen
orally indicated by Il popping" in
tho @carnuretor. Now as the mixture
VIII become too weak when the gas
olIne does not feed fast enough. 10
fact hat II docs not feed fast enough
viii! usually be Indicated by Il pop
ping. especially at high speeds.
From the abov. wc can reason tNht
" the engine has been running We'll
and the carburetor adjus'Inenls nav
not been tnnpcrcd with. II II erau-
ual!y loses power and there - y
popping in the ~carnur"tor az 'lleh
speeds. that the gasoline no" is oo-
structcd in some way.
should you be troubled ny TOSS OF
power and popping. before concLuh-
ing that an OBSTRUCTION III l"c -"
system Is the cause. you must pcH'
In mine that the popping misnt aiso
hc due 70 other causes. ana mrs. -,
SURE that the trouble ~ not one OF
,Lcsc. Thus the popp!ns MAJ be
due to q poorly adjustc! carourctor'
IL. TO water in tn. gasoline. or 10
the engine being cold
The best advice which can be tiyrh
In reference 10 the carhrretor adj
justncuts IS once right. lot them
al.n.." Some carburetprs. when
have an automatic. auNiliary AZ
valve, which valve Is t'ih 'EtlhH' ,ta
ecnt by Il light spring. "ill aIlo" inc
mixture TO become weaker occauae
the spring loses It's tension OF
strength. rhersiore; II h"PnlmmGG6
gradually develops II w"n.n n' 900
10 tighten ths spr!ng there be an
ndius;ing screw for this purpose or
IL not. to make the mixture tIiikht'E
rider before taking The f"en nm
uunrt. II tn!s does not remedy 'NS
trouble. set the adjustments back Il"
where they were. 49, 20
II an inlet valve leaks, Quo ="
needing grinding or noi ssatins prpp.
No cspIosiou siork. and so isnli;
the MIXTURE III the inlet mani'G!n
ana thus cause popping InlI'"s. V;EI
the way, is due TO the MIXTURE III
The nnnind iGniting, When Ia.
mixture liz weak. 1t wil! be iGnltei
because the partly SaSso
are still burning when the 4hic' 'at'e
uav!ng determined mat the ,rou-
hlc .s due 70 too s!ow Il ieeh o. "a,
gasoline. let us see shy the feed ear!
e. 700 slow. In tho illustration he;
simplest method OF feeding the gas
olinu is shown; EaWe!y inc gray
FRS, we have the gas tanks. How
can ,his cause u failure Oi the Gbso-
line 10 feed prOp.riy? " Curse ~
may be empty, or me gAS'..me -,
lower than the gasoline "a h car
burctor. The latter condition ottS.
occurs when the car IL c~liinhlHE IL
steep hill. when the thing 10 do - 20
go up The hi backward
Sometimes the vent hole ~ IN
tho nller cap wnt DC cloFEed up,
viii gradually tnrm In the tanE and
90 the gasoline viii be sort of held
hack. II ~ n good plhn to look 70
this ven, hol. when Milns the tank
Mex, TO the tank CONES h yaive,
The ROPER Tyne Of yaivG 5h nw
ward when the valve - open soinl
times. however. the Anger piece is
horizontal. As shown NJ Is "hsn Ihe
valve rs open. when this - the case.
because OF the Jor and vibration OF
the car. If a little vast. etc wsre
TO get into the tank II i~,rnhahiS
would hc caught ny the valve ana
70 check the tiow 81 the gasoline
%cX, comes thS tubing SEDIMENT
orally wiil be at the bottom OF Il
sharp bend When tubing is In
stalled. care ou!d he taken 10 nave
as few bends as possible ana no
sharp bonds,
Snrowhcre i'll tho gas line there
usually ls u water trap and siraincr,
Is e iiere vii! b.. found much o.
the feed line trout". The water
trapped here may check the flow o!
the gasoline, The gauzc ~stra!ner amy
b. dirty. Every. week or TWO about
ha!f q cupful OF gasoline should b..
drawn out OF this trap. ~ water be
IN ". s.: VIII be the nrst 10 drain of.
Finally we come to The carburetor
itself. The gasoline VIII enter the
earburctor through tho noat valve r.
BIZ generally must ;irs, PASS the
.,raincr q. Sometimes dir, VIII re;
under the waive needle, and so cause
the level OF the rasoii In the tioat
chamber 70 be too low or too high,
rcsnectivcly
h noat and the noat valve
mechanism do sometimes get out Of
order. but their troubles are gencr-
aiIy. SUCH as viii cause the level 70
bc too high. and so mixture TOO rich,
rather thhD ton low and too weak.
Today most ars hay" the vacuum
feed system. While the mechanism
OF the vacuum tank viii sometimes
stick or got ont OF order, the troubles
of this system will generally be due
20 air leaking into the cuu cham
her aud so destroying the vacuum.
When this is the case the tank VIII
become dry, os that opening the pet
cock at bottom of 81 viii show II
gasoline ilows out OF IN. pet cock.
oyu know the vacuum tan kis o X.
while IL none flows. YOU know il, is
often duc TO lcakarcs in the tube
which runs from the Inlet manifold
10 the top OF the vacuum tank. or to
the cover o fthe tank bccoinin. olosc
and 50 allowing air to leak in. The
vent hole in the filler cap OF the sun
ply tank must be kept open. Just as
for the gravity SYSTEM.
The vacuum system is subject to
all Of the troubles Of the gravity
system. in addition to those peculiar
TO itself. The same is true of the
pressure feed system.
The pressure feed system, fns, he
coming obsolete. II subject to an
annoying loss of pressure. This NAV
be duc 70 leakag" nj the hand punp
iailurc or leakage at the mower
pump, leakage AZ II" tubes. the filler
t1p or the gauEc which shows how
much gasoline is in tho tank Leak
often. '