
Fuel
System
The fuel system should be installed in such a manner as
to
allow the engine-mounted fuel lift pump
to
pump
to
maintain a positive inlet pressure
to
the injection pump under
all
operating conditions. The minimum size
of the fuel supply line and fuel return line is 1/4 inch, inside diameter, and there should be a primary fuel fil-
ter installed between the fuel tank and the fuel lift pump. Only one fuel filter is installed on the engine, be-
tween the mechanical fuel lift pump and the injection pump; this filter has a replaceable filter element.
The fuel tank's fuel pickup tube should be clear and unobstructed.
No
screens
or
gauze strainers should be
incorporated in the fuel pickup tube.
Make sure that the fuel supply and return
lines are securely anchored
to
prevent chafing and that all fittings
are sufficiently tightened
to
prevent leaking. Also make sure your fuel system has a positive shut-off valve;
know its location and
how
it operates.
NOTE: DO NOT use spring-loaded check valves in the fuel supply line in lieu of mechanical
shut-off valves. This type valve can create fuel starvation problems
for
the engine's fuel sys-
tem.
Fuel tanks that are located below the engine's fuel system level must have its fuel return at the tank extend-
ing down into the tank in the same manner as the pickup tube, otherwise fuel siphoning out
of
the engine's
fuel system through the return will take place.
Make sure the fuel tank filler is properly
sealed
to
prevent water entry should it become awash. The fuel
tank's vent should be routed so as
to
prevent water entry as well.
Be sure there is a fire extinguisher installed near the unit and that it is properly maintained. Be familiar with
its use. An extinguisher with the NFPA rating of
ABC is appropriate
for
all applications in this environment.
Oil
Drain
Hose
An oil sump drain hose is installed on the engine with the discharge end secured
by
a bracket at the front of
the engine.
Oil may be drained from this hose
by
removing the cap and the discharge end of the hose from
the support bracket and lowering the hose into a container. The hose cap fitting is 1/4 inch NPT (National
Pipe Tap) and can be extended,
or
have a pump added,
for
easier removal
of
the old oil, if desired.
Connecting
Pressure Sensing Devices
to
Oil Galleries
Oil pressure sensing devices, such as senders and switches, must not be connected
to
an engine's oil gal-
lery with the use
of
extended nipples
or
tees. The reason is simply that continued engine vibration causes
fatigue
of
the fittings used
to
make such a connection. If these fittings fail during engine operation, lubricat-
ing oil will be lost and internal engine damage will result.
When additional sensing devices such as switches
or
sensors need
to
be installed that function on engine
oil pressure, these devices must be bulkhead-mounted and connected
to
the oil gallery using an appropriate
grade
of
lubricating oil hose. Any fittings used
to
connect the hose
to
the gallery must be of steel
or
malle-
able iron composition. Brass must not be used
for
this application.
25 Westerbeke Generators
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