MAIN
JET SYSTEM - the main jet meters all of the
fuel to
the
main system. The
main
fuel system
components
meter
fuel from 1/ 8
throttle
to
full
th
rott
le.
ECO
NO (POWE
R)
JET SYSTEM - is similar to
the
ma
i n system in
that
it only
draws
fuel
when
there
is
enough a
ir
fl
ow
through the
venturi
to
draw
fuel
th
rough the system. The fuel
that
passes
th
r
ough
the system is metered by a reverse type jet.
This
system h
as
th
e most effect
during
wide
open
throt-
tle position
wh
en
the
engine is operating at
engine
speeds above
5000
RPM. Use of econo
jet
gives
better
engine
response at
high
engine RPM's (over
5000
RPM) and better fuel
economy
at
lower
en-
gine
RP
M.
At
wid
e open
throttle
the
main
jet
sup-
plies approxima
tely
70
%
of
the engines fuel re-
quirements
whi
le the econo
jet
supplies
30
%.
The
econo
jet
stops feeding fuel
below
1/ 2
throttle
or
5000
RP
M
due
to the red uction of
ai
r
flow
through
the
carbure
t or bore at reduced thro
ttle
settings
.
Fuel
Pump
Removal
1.
R
emo
ve air intake silencer
from
carburetor.
2. Remove
fue
l
in
let line
from
fuel pump. Plug
end of f uel line. (See Fi
gure
3-21 .)
3. Remove
fuel
outlet
line and
impulse
line
from
fu
el
pump.
4.
Remove t
wo
fuel
pump
mounting
nuts.
1.
Fuel Inlet Line
2.
Fue
l Ou
tlet
Lines
3.
Impulse Line
4.
Fuel Pump
Fi
gure 3-21
3-
40
FUEL PUMP
Disassembly
1. Remove
the
ei
ght
reta
iner
screws
. (See Figure
3-22.)
BODY A
BODY B
1.
Screw
2.
Screw
3.
Cap
B
__
1
\
©
____
2
U
0
--7
6.
Gasket
7.
Diaphragm
8.
Gasket
9.
Bottom
Body
10.
Valve
11
.
Grommet
4. Diaphragm
Assembly
12
.
Spring
5. Filter 13.
Alignment
Tabs
Figure
3-22
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