Engine Starting - freightliner WALK-IN VAN CHASSIS Operator's Manual

IMPORTANT: Close all windows and doors dur-
ing the fueling process. Keeping windows and
doors closed allows for easier leak detection
inside the cab after fueling.
WARNING
Natural gas fuel tanks, lines, and valves are al-
ways pressurized. Always observe safety precau-
tions. Failure to do so could lead to loss of con-
trol over a filling hose or to ignition of the natural
gas, which could cause serious bodily injury,
death, or severe property damage.
2. Ensure all fuel cylinder shutoff valves are open.
3. Ensure the vehicle fuel system main shutoff
valve is open.
4.
Open the CNG fuel panel access door and re-
move the dust cap from the vehicle fuel fill port.
5. Ensure the O-ring is present inside the fuel fill
port. If the O-ring has been dislodged or is miss-
ing, the station dispensing nozzle will not con-
nect securely to the fill port.
6. Turn the selector knob on the service pump to
the VENT position, if equipped.
7. Connect the quick coupling on the dispensing
nozzle securely to the vehicle fuel fill port.
8.
Turn the selector knob on the service pump to
the FILL position, if equipped.
IMPORTANT: If at any time the service pump or
vehicle begins to vent CNG uncontrollably, notify
a station attendant or activate the service sta-
tion emergency shut-off switch to cease the flow
of CNG.
9. Switch on the service pump. A slight hissing
noise may be heard as the fuel cylinders fill.
10. Watch the pressure gauge on the service pump.
When the gauge reads approximately 3600 psi
(24 821 kPa), or when the fill pressure stops
climbing, the CNG cylinders are full. The service
pump will shut itself down automatically. See
Table 8.1 for pressure compensation values
based on ambient temperatures.
11. Move the selector knob on the service pump to
the VENT position, if equipped. A short hiss will
Compressed Natural Gas Fuel System
Do not attempt to remove the fill station nozzle
from the tank fill fitting until venting of pressure
is noted. If no venting occurs, ask for assistance
from the station attendant. Removing an un-
vented coupling could result in an uncontrolled
hose, which could lead to property damage or
personal injury.
12.
13.

Engine Starting

1.
2.
Protect the turbocharger during engine start-up
by not opening the throttle or accelerating the
engine above 1000 rpm until normal engine idle
oil pressure registers on the gauge.
3.
4.
Do not crank the engine for more than 30 sec-
onds at a time during any of the following proce-
dures. Wait two minutes after each try to allow
the starter to cool. Failure to do so could cause
starter damage.
5.
be heard as a small amount of natural gas is
vented into the hose.
WARNING
Remove the station dispensing nozzle from the
vehicle fill port.
Install the dust cap on the vehicle fuel fill port
and close the fuel panel access door.
Set the parking brake.
Move the fuel shut-off valve handle to the RUN
position.
NOTICE
For automatic transmissions, make sure that the
transmission shift control is in Neutral (N), Park
(P), or the Park Brake (PB) position.
Turn the ignition switch to the START position.
See Fig. 8.1 for the four-position ignition switch
and Fig. 8.2 for the three-position ignition switch.
After the engine starts, release the key.
NOTICE
Bring the engine up to operating speed gradually
as it warms up and develops stable oil pressure.
8.2