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WARNING
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling, storing,
and using fuels.
Fuel system.
Explosive fuel vapors can cause
severe injury or death. All fuels are highly explosive in
a vapor state. Use extreme care when handling and
storing fuels. Store fuel in a well-ventilated area away
from spark-producing equipment and out of the reach of
children. Never add fuel to the tank while the engine is
running since spilled fuel may ignite on contact with hot
parts or from ignition spark. Do not smoke or permit
flame or spark to occur near sources of spilled fuel or
fuel vapors. Keep fuel lines and connections tight and in
good condition. Do not replace flexible fuel lines with
rigid lines. Use flexible sections to avoid breakage
caused by vibration. Do not operate generator set in the
presence of fuel leaks, fuel accumulation, or sparks.
Repair systems before resuming generator set
operation
Draining fuel system. Explosive fuel vapors can
cause severe injury or death. Spilled fuel can cause
an explosion.
Use a container to catch fuel when
draining fuel system.
draining system.
The diesel fuel system for the generator set must be
designed to operate independently of the system for the
vehicle engine if both engines are to be operated at the
same time. The best way to do this is to have separate
fuel tanks; however, this is usually impractical because
of space restrictions. In most installations, both engines
operate off a common tank with a separate dip tube
arrangement as shown in Figure 6-13. This prevents
the smaller engine from being starved of fuel by the
larger engine. The generator set dip tube is generally
shorter than the vehicle dip tube.
arrangement, fuel may not be available to the generator
set when fuel supply is low.
A simple tee fitting is sometimes used to provide fuel for
both engines off a common tank; however, this usually
prohibits simultaneous operation. There is also the
possibility that operation of either engine could
TP-5605 4/97
Fuel System
Wipe up all spilled fuel after
With this
completely drain the fuel line of the other engine, thus
making starting difficult if not impossible. Therefor, the
tee arrangement should not be used.
1
Keep Fuel Line
Away From Exhaust
1. Fuel line to generator set
2. Fuel line to vehicle engine
Figure 6-13. Two Dip Tubes in Fuel Tank
Do not tee into fuel-injected fuel systems. Use a two dip
tube arrangement for fuel supply. Consult an authorized
Kohler service dealer/distributor for further fuel system
installation information.
Take care when routing the fuel line from the fuel tank to
the generator set. Keep fuel lines as short as possible
but maintain adequate clearance from the exhaust
system.
Run fuel lines along the frame or
undercarriage— never run fuel lines inside the coach.
Locate fuel lines below the generator set compartment
with entry point near fuel pump (max. lift of the fuel pump
is 1 meter or 39 inches). The fuel line must be of
adequate size to handle the flow of fuel and withstand
road shock and year-round climate conditions. If using
steel tubing, it should be 5/16 in. (8 mm) I.D. (minimum)
with an 8 in. (230 mm) (minimum) flexible section to
allow free movement of the generator set. Fuel inlet and
return connections are 1/4-18 N.P.S.F.
Locate the fuel return line as far as practical from the fuel
pickup. This will allow returned fuel to be cooled by the
tank fuel before delivery back to the fuel injectors.
Incoming fuel cools the injectors and achieves
maximum engine efficiency supplying cool fuel to the
engine. The fuel tank capacity and the amount of fuel
will affect cooling capability.
Fuel Line Sizes:
Fuel Inlet
Fuel Return
2
5605613
NOTE
1/4-18 N.P.S.F.
1/4-18 N.P.S.F.
Installation 6-13
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