TP-5986 4/03 9Section 4 Fuel System
Section 4 Fuel System
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling,
storing, and using fuels.
WARNING
The fuel system. Explosive fuel vapors can cause severe
injury or death. Vaporized fuels are highly explosive. Use
extreme care when handling and storing fuels. Store fuels 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 because spilled fuel may ignite on
contact with hot parts or from sparks. Do not smoke or permit
flames or sparks to occur near sources of spilled fuel or fuel
vapors. Keep the fuel lines and connections tight and in good
condition. Do not replace flexible fuel lines with rigid lines. Use
flexible sections to avoid fuel line breakage caused by
vibration. Do not operate the generator set in the presence of
fuel leaks, fuel accumulation, or sparks. Repair fuel systems
before resuming generator set operation.
Explosive fuel vapors can cause severe injury or death.
Take additional precautions when using the following fuels:
Gasoline—Store gasoline only in approved red containers
clearly marked GASOLINE.
Draining the 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 the fuel
system. Wipe up spilled fuel after draining the system.
4.1 General
In most installations, both the generator set and the
vehicle’s engine operate from a common fuel tank with a
dual dip tube arrangement. The generator set’s dip tube
may be shorter than the vehicle engine’s dip tube. With
this arrangement, fuel may not be available to the
generator set when the fuel supply is low. See
Figure 4-1 for fuel system schematic.
Generator
set fuel
pump
Vehicles
engine
1
2
3
1. Fuel tank
2. Dual dip tubes
3. Fuel filter
598641
Figure 4-1 Fuel System Schematic Typical
4.2 Float Bowl Vent System
The float bowl vent system prevents fuel from
overflowing into the bilge. In the event of an overflowing
float bowl due to a sticking float valve, the float bowl vent
tube redirects the unused fuel back into the intake per
USCG regulations. Check for fuel leakage at the
backfire flame arrestor for troubleshooting an
overflowing float bowl.
4.3 Fuel Pump and Filter
Electric fuel pumps draw gasoline from the fuel tank,
through a filter, and supply clean gasoline at the proper
pressure and quantity to the generator set engine
carburetor.
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