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FUEL SYSTEM
FUEL LINES
The fuel return line at the fuel tank should extend down to the
bottom of the tank in the same manner as the fuel pickup tube.
This must be done in an installation where the fuel tank is located
below the engine's fuel system. This precaution insures against
hard starting due to air displacing fuel siphoning out of the
engine's fuel system through the return line when the engine is
shutdown.
A
WARNING:
Shut off the fuel valve at the tank when
servicing the fuel system. Take care in catching any fuel
that may spill. DD NOT allow any smoking, open flames
Dr other sources of fire near the fuel system when
servicing. Ensure proper ventilation exists when
servicing the fuel system.
FUEL FILTER/WATER SEPARATOR
Westerbeke recommends that you install and regularly service a
good quality Coast Guard approved visual-type primary fuel fIlter
of the water-separating type. This fuel fIlter/water separator must
be installed between the fuel tank and the engine to prevent any
contaminants or water that may be in the fuel from reaching the
fuel lift pump and causing damage to the fuel system components.
It
may also prolong the life of the fuel fIlter that comes installed
on the fuel line. It is the responsibility of the owner-operator to
install this fuel filter/water separator. Select a fIlter that has a #2
or
#
1 0 micron rating.
Most installers include a fuel fIlter/water separator with the
installation package as they are aware of the problems
contaminants in the fuel can cause.
A typical fuel fIlter/water separator is illustrated below. This is the
Raycor Model 500 MA. Keep in mind that
if
a water separator
type fIlter is not installed between the fuel supply tank and the
engine-mounted fuel system, any water in the fuel will affect the
fuel pump, engine filter and injection equipment. The
owner/operator is responsible for making certain the fuel reaching
the engine's injection equipment is free of impurities. This
process is accomplished by installing and maintaining a proper
fuel
fUlcr/wMer
sepmmo'·1j:~l
\f
I ' \ .
FUEL Fll
TERI
WATER SEPARATOR
(owner installed)
FUEL INJECTION PUMP
The fuel injection pump is a very important component of the
diesel engine, requiring the utmost care in handling. The fuel
injection pump has been thoroughly bench-tested and the
owner-operator is cautioned not to attempt to service it. The only
adjustment the servicing mechanic should make to the fuel injec-
tion pump is the adjustment for engine idle speed (see IDLE
SPEED ADJUSTMENT under ENGINE ADJUSTMENTS). Ifit
requires servicing, remove it and take it to an authorized fuel
injection pump service facility. Do not attempt to disassemble
and repair it.
FUEL INJECTOR
For information about removing and checking the fuel injector,
see TESTING THE FUEL INJECTOR under ENGINE ADJUST-
MENTS.
In case of severe vibrations and detonation noise, have the injec-
tors checked and overhauled by an authorized fuel injection ser-
vice center. Poor fuel quality, contaminants and loss of positive
fuel pressure to the injection pump can result in injector faults.
Since fuel injectors must be serviced in a clean room environ-
ment, it is best to carry at least one extra injector as a spare should
a problem occur.
BLEEDING THE FUEL SYSTEM
The fuel injection pump is self-bleeding; any air in the fuel lines
will bleed out through the fuel return line. Bleeding can also be
done by using the manual fuel primer on the fuel lift pump (see
illustration). In case the engine is shut down due to lack of fuel,
use the manual fuel primer
to
bleed the system after refilling the
fuel tank; it will not be necessary to disconnect the fuel lines to
bleed the air. Also use the manual fuel primer to bleed the
system after changing the fuel filters.
Bleeding the fuel system will also be necessary before the
engine is layed-up during the off-season or for prolonged periods
of inactivity. See LAY-UP AND RECOMMISSIONING.
To use the manual fuel primer, work the lever back and forth with
slow complete strokes. If pressure isn't felt, rotate the engine 112
turn; this will reposition the fuel pump to improve the pumping
action.
SPARE PARTS
While the likelihood of having to service the system at sea is slim,
the possibility does exist. Therefore, we recommend that banjo
washers, injector seat washers and a fuel fIlter be carned on board
at all times. Purchase needed spare parts from your local
WESTERBEKE dealer or distributor. If a leak should develop at
a banjo washer that cannot be corrected by a simple tightening of
the fitting, replace the sealing washer with a replacement found in
the hardware kit for your model.
Engines & Generators
26
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Troubleshooting
