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3
.8
CARBURETOR
..o
.
~c-
-.s-:-
--
- ·::h ent
ers
through
·
i e.
X
posses
-e v
@
where
i is
e•e
ed and then
- e
fuel
from
the
fuel
passage
hole
®
-
s::"
rged
from
pilot
o
lel
@
toward the
olve
@
as a
fuel
air
mix·ure
and finally
as
.
"·h
th
e main
ai
r
stream
before
entering
the
3.
FLOAT
CHAMBER
For
550
and
565,
the
fuel from
the tonk
enters
fu
el
passage
@,
passes by valve seat
@,
float valve
~
and
enters float chamber
@.
As
the
fuel fill the
float chamber,
the float
@
rises and forces
the float
valve against
the
valve seat with the float arm
@
o
shut off
the
fuel flow into the float chamber.
As
the
fuel
in the
float chamber is consumed and
the
fuel
level drops, the
float
also
lowers
with the
fuel
leve
l
and
allows the float
valve
to unseat
from
the
valve seat, permitting
the
fuel
to
enter the
float
chamber.
This cycle
is
repeated to
maintain a con-
stant fuel level.
A
spring
is
incorporated in
the
float
valve
@)
wh
ere
the float
arm
@
make
contact, for
th
e
purpose
of
absorbing
the
shock
and preventing
w
ea
r to
the
valve
and
seat
caused
by
the
fluctuation of
the
flo
at
wh
en
driving over rough road and
in
addition,
it
serves
to maintain a constant full
level
in the float
chamber.
Overflow
pipe
If any foreign object
shou
ld
get stuck in between
he float
valve and seat and causes
the
fuel
to
over-
flo
w out
of the
slow
jet
o
r th
e
needle
jet,
th
e
fuel
will
enter the engine and dilutes the oil.
To prevent
such
an occurance,
an
overflow pipe
@
is incor-
po
rated
into
the
float
chamber
@.
The
outlet of
the
overflow
pipe
@
is
high
er
than the
normal
fuel
level
and
therefo
r
e,
has no effect, but
under
overflow
condition,
the fuel level rises and the overflow fuel
is
drained o
uiside.
(Fig.
3-
1 08)
Figure
3-
108.
Float
IS65l
Fieure.
3-109.
float
~hoinber
45
~
0
·er
"low
pipe
onnal
fuel
level
8
Float
chamber
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