Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1918-02-24
.SIMPL|F|ED LESSONS IN
PROPER CARE OF AUTOS
Popping in Carburctcr at High
Speeds Generally Indicates
Trouble With Gasoline.
COLD ENGINE Wild CAUSE IT
Sometimes 1t Is Necessary TO Ascend
Hill Backwards When Fuel Tank
IS Nearly Empty - Vent Hole
Should BE Open.
LESSON so. ~.

large percentages of carburctcr
trouble is duo 10 tho feeding OF tho
gasoline from tho gasoline tank TO the
carburctrr Sometimes tho gasoline
Will feed too fast. though this. which
is practically always due TO Il defect
IN tho noat va,ye is not nearly so
often the case AS is the gasoline feed
ing too slowly. %@4
When the mixture is too lean. or
weak. thot is who, the percentage Of
gas to air is too small. :: IS generally
indicated by Il popping" In the car
burcter. Now as the mixture will be-
come too weak when the gasoline docs
not feed fast enough. the fact that it
docs not feed fast enough will usually
be indicated by a popping, especially at
high speeds.
Feom the above VIC can reason thar
IL the engine has been running tclL
and the c.rburcter adjustments have
not been tampcrcL with, if il grad
nally loses power and there is q pop
ping in tho carburctcr at high speeds,
that tho gasoline How is pbstructed In
some way.
Should you be troubled by loss OF
power and popping, before conclud-
ing that an obstruction in the feed
system is the cause. you must bear
w IHlHU tndi INC Popping iliiEIt ALSO
be due to other causes. and first be
sure that the trouble is not Of
these Thus the popping may be due
10 a poorly adjusted carhureter; to
inlet valve not seating properly; to
water In the gasoline; or to the en-
Cine being cold.
The best advice which can be given
In reference To the carburcter adjust
ments Is once right. let them alone"
Some carburctcrS which have an auto
matte auxiliary air valve, which valve
Is held against It's seat by light
spring. will allo~ tn. mixture to be-
come weaker because tho spring loses
It's tension or strength. Therefore. ir
popping gradually develops it would
he good To tighten the spring VI there
be an adjusting screw for this pur-
pose: or. II not. 10 make the mixture
slightly riGhcr before taking the feed
limo apart. IT this does not remedy
the trouble. set the adjustments back
to where they were
II an inlc; waive leak. due 10 need
Ing grinding or not seating properly.
spark may get past 1t during the
explosion stroke and so ignite the mix
iurc in the inlet manifold and thus
cause popping Popping, by the way.
is du" TO tho mixture in the manifold
igniiina. When the mixture is weak.
!; Will he igniisd because the partly
exhausted eases are stBl burning when
tho inle, waive is opened.
Having determined that The trouble
In due 10 TOO slow at feed Of the ,.;aso-
line lei US sec why tho feed can he
too slow. In the Illustration the
simplest method OF feeding the gaso-
line is shown: namely, the gravity sys-
tom.
''rst We have the gas tanks. How
can this cause a failure OF the gasoline
: to feed properly? OF course. ii may be
empty. or the gasoline may bc so low
az 10 have The top of il lower than the
gasoline in the carburctor. The latter
condition often occurs when the car is
climbing a steep hill. when the thing
10 do is 10 go UP the hill backward
Sometimes the vent hole ca in the
fllc- cap viii be cloggcd up. When
{ this happens partial vacuum VIII
gradually form III the tank and so the
gasoline Will be sort OF held back II
is good plan 10 look to this vent hole
when filling the tank and make sure
that IL Is not stopped up.
Next 10 the tank comes the valve
The proper type OF valve should have
the finger piece pointing downwa I'd
|; when the valve is open. Sometimes
however. the finger piece is horizon
tai. as shown at L. when the valve is
open. When this Is the case. the valve
may slowly close OF itself because OF
the jar and vibration OF the car III n
little waste. etc, were TO get into the
tank IL probably would be caught by
the valve nd so check the flow OF the
gasoline.
Next comes the tubing. Sediment
may clog this. When il does it gem
orally will be at the bottom OF sharp