Owner`s manual
BLEEDING THE FUEL SYSTEM:
It
will
be
necessary to bleed the fuel system to achieve a steady air free flow of fuel if any of the follow-
ing have occured: Models M-12, M2-12,
M3-20, and M4-30 have self bleeding fuel systems. .
1.
Running out of fuel.
2. If fuel shut off valve is left closed and engine runs out of fuel.
3. Replacing fuel filter.
4.
Fuel injector nozzle or injector pump repair.
5.
After repairing or replacing any fuel line.
6.
Before putting engine back into service in the spring, if fuel system has been drained.
7.
Replacement of electric or mechanical fuel pump.
8.
Any time air is permitted
to
enter the fuel system.
BLEEDING
PROCEDURE:
Be
sure to have some means available to catch or absorb any fuel escaping during the bleeding pro-
cess so that it will not accumulate in the engine compartment or bilge.
1 . Be sure there
is
a sufficient supply of fuel in the fuel tank.
2.
Open the fuel shut-off valve at the tank.
3.
Start the electric fuel pump by turning the ignition key to the
"ON"
position
on
models 18,
20, 25, 30, 50, all models after 1986.
4. Model 15 has a mechanical
fuel pump. Therefore with decompression on, turn engine over
with starter.
Crank at 10 second intervals while doing steps
#5
and
7.
5.
Slowly loosen the air bleed plug
on
the fuel filter, letting air escape until
an
air free flow of
fuel is evident. (1986 models
see
item 7).
6.
At this time, tighten the air bleed plug
on
the filter.
7.
Slowly loosen the air bleed plug
on
the injector pump, letting air escape until
an
air free flow
of fuel is evident. Units with a self bleed return valve, open for a short period then start
engine, as soon as engine runs smooth close valve. Model-12 has continuous
fuel bleeding.
8.
At this time, tighten the air bleed plug or knurled knob
on
the injector pump.
9.
The fuel system should now be properly bled and ready for operation.
Refer to starting instructions before attempting to start the engine after bleeding the
fuel system.
CAUTION: Excessive cranking with sea cock valve open can cause water accumulation
in
the muffler and possibly back up into the engine. Drain muffler as needed.
FUEL
INJECTORS:
Fuel
injectors should be removed and taken to a qualified diesel engine repair center to be tested for
leakage and spray pattern,
if
poor engine performance such as loss of power, rough or uneven runn-
ing, sudden notice of dark exhaust, or engine becomes hard to start.
24