4-52
FUEL
Side
of
the engine
with
the vacuum
opening
shown.
The fuel
pump is mounted
over
this opening
to
receive
the vacuum/pressure
from
the crankcase
for operarion.
TROUBLESHOOTING
If the spark plug of the cylinder to which
the vacuum line is connected
becomes
wet
fouled,
the
cause
may very well be a rup-
tured fuel pump diaphragm.
This reasoning
is
sound
for
both
types
of
fuel
pumps.
Sometimes
the pump that
is
not serviceable
is bolted
directly
to the side of the engine
block.
On other
installations
this non-ser-
viceable
pump has a vacuum hose connected
to the
cylinder
block.
When the
pump is
bolted
directly
to the
block, the
pump re-
ceives
vacuum
directly
from
the
cylinder
through a hole in the back side of the pump
and a matching
hole in the block.
A good test
for
the pump that
is con-
nected
to the intake
manifold
with a vacu-
um hose, is to disconnect
the vacuum
line
Two different
fuel
pumps installed
on OMC engines.
Service
on these
two
models is limited
to
removing
the
cover and cleaning
the screen.
from the engine, operate
the squeeze
bulb in
the
fuel
line until
it is firm,
and then
to
carefully
observe
the
end of
the
vacuum
hose to detect
any fuel leakage.
The smal-
lest amount of fuel from the hose indicates
a damaged
diaphragm.
The pump must be
rebuilt to restore
satisfactory
service
of the
pump.
To test
the
non-serviceable
pump,
re-
move the pump from the engine, operate
the
squeeze
bulb until it is firm, and then care-
fully observe
the vacuum
hole in the back
side of the pump for any indication
of fuel.
The
SOl
allest
amount
of
fuel
indicates
a
damaged diaphragm.
In this case, the pump
MUST
be replaced.
PUMP
REMOVAL
AND
REPAIR
1-
Identify
each
hose and its location,
then
disconnect
the
vacuum
hose and t\\70
fuel hoses from the fuel pump.
Remove the
three
attaching
screws securing the pump to
the engine.
Two screws are visible on top of
the pump and the third is hidden behind the
fuel inlet nipple.
2-
L\;;ount the
fuel
pump in a vise,
as
shown.
Loosen the
plastic
screw
securing
the filter
bowI to the pump.
3-
Swing the hinge down and lift the fuel
bowl free
of the
pump.
Remove
and
DIS-
CARD
the bowl gasket and filter.
Содержание 4906B 4HP 1969
Страница 5: ......
Страница 85: ...3 44 POWERHEAD EXHAUST COVER I LEVER Exploded drawing of a 5 5 hp powerhead 1956 60 principle parts identified...
Страница 87: ...3 46 POWERHEAD Exploded drawing of a 7 5 hp powerhead 1956 58 with principle parts identified...
Страница 88: ...CYLINDER BLOCK 3 47 HEAD GASKET RING...
Страница 89: ...3 48 POWERHEAD HEAD BYPASS COVER Exploded drawing of a 10 hp powerhead 1956 63 with principle parts identified...
Страница 90: ...CYLINDER BLOCK 3 49 THERMOSTAT EXHAUST COVER The...
Страница 137: ...4 46 FUEL LEVER AND LOW SPEED...
Страница 153: ...4 62 FUEL Exploded view of a pressure tyoe fuel tank with major parts identified...
Страница 157: ...4 66 fUEL...
Страница 177: ...5 18 IGNITION FLYWHEEL Exploded drawing of a typical magneto system Only one coil and set of points is shown...
Страница 271: ...8 12 LOWER UNIT PROPELLER Exploded drawing of the Weedless lower unit gear case with major parts identified...
Страница 285: ...8 26 LOWER UNIT Exploded drawing of a lower unit with a window for access to the shift connector...
Страница 412: ...A 16 APPENDIX Wire Identification 33 hp with Generator 1965 67...
Страница 413: ...APPENDIX A 17 o C...
Страница 414: ...Wire Identification 33 hp with Generator 1969 70...
Страница 415: ...APPENDIX A 19 Wire Identification 35 hp 1957 59...
Страница 416: ...A 20 APPENDIX Wire Identification 40 hp Standard Shift with Generator 1960 66...
Страница 417: ...APPENDIX A 21 UJ cc b Wire Identification 40 hp Standard Shift with Generator 1967 68...
Страница 418: ...A 22 APPENDIX ee I U Vl Z Z o U I I Wire Identification 40 hp Standard Shift With Generator 1969 10...
Страница 419: ...APPENDIX Wire Identification 40 hp Electric Shift with Generator 1961 66 A 23...
Страница 420: ...A 24 APPENDIX C 00 Wire Identification 40 hp Electric Shift with Generator 1967 68...
Страница 421: ...Wire Identification 40 hp Electric Shift with Generator 1969 70...
Страница 422: ...NOTES NUMBERS...