freightliner 108SD, Driver Manual

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If the vehicle is in motion when the audible alarm
activates, bring it to a safe stop, shut down the en-
gine, and exit the vehicle.
Do not open the hood.
If outside the vehicle when the audible alarm acti-
vates,
do not open the cab door or hood.
In the event of an audible alarm, immediately follow
these procedures, as allowed by conditions:
1. Immediately shut off all engines. Extinguish any
cigarettes, pilot lights, flames, or other sources of
ignition in the area and adjacent areas.
2. Manually close all fuel shutoff valves, including
those on the LNG tank or CNG cylinders.
3. If the vehicle is indoors (as in a service shop),
immediately open windows and doors to provide
extra ventilation to the area. Do not start the en-
gine or any other type of equipment until the gas
leak is corrected and the area cleared of natural
gas.
4. Evacuate the area.
5. Check the fuel lines, LNG tank/CNG cylinders,
and fittings to locate the leak. After the area is
cleared of natural gas and the alarm is no longer
active, have the vehicle inspected by a qualified
technician.
IMPORTANT: Do not consider the area clear
until all alarm indicators are off, and the alarm
panel light returns to green.
Sensors
Gas detection sensors are located on the cab over-
head console and in the engine compartment on the
frontwall. The sensors are located in high areas,
where rising gas vapors will pass by or accumulate.
If the system detects that one of the sensors has
been disconnected or has malfunctioned, the sensor
fault light for that zone will illuminate. A failed sensor
may trigger and lock on an alarm. If a fault condition
or locked alarm continues after the sensor’s connec-
tion and wiring integrity has been verified, replace
the sensor.
The sensors are sensitive to all hydrocarbon vapors.
An alarm may be triggered by the use of chemicals
such as cleaners, paint, polish, lacquer, gasoline,
silicone, silicone spray, or other harsh chemicals.
The sensors will also detect hydrogen fumes from an
overcharged battery. If a sensor sends an alarm, but
no gas fumes are present, check for recent use of
chemicals or a battery charger.
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Fig. 19.4, Interior Warning Sticker
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Fig. 19.5, Exterior Warning Sticker
Natural Gas Vehicle
19.6