Freightliner Business Class M2. Manual — part 31
• All fittings, connections, and joints
8.
Replace leaking or damaged fuel lines. Repair or
replace leaking or damaged fittings.
47–06 CNG High-Pressure Fuel
Filter Element Replacing
CNG filter element replacement cycles are an impor-
tant factor in maintaining the CNG fuel system integ-
rity and ensuring maximum operating performance.
Actual frequency of the filter element replacement
could increase or decrease depending on the cleanli-
ness of the fill station fueling system.
1.
Shut down the engine and apply the parking
brake.
2.
Close the CNG fuel cylinder shutoff valves.
3.
Start the engine and let it idle until the fuel lines
are empty and the engine stops. The gauges on
the fuel panel should now read at or near 0 psi.
4.
Close the manual fuel shutoff valve on the fuel
panel.
5.
Remove the two capscrews that secure the ac-
cess cover to the fill panel, then remove the ac-
cess cover. See
. Save the capscrews for
reinstallation.
6.
Slowly open the bleed valve on the manifold to
relieve remaining fuel pressure within the sys-
tem. See
IMPORTANT: Some pressure may remain in the
fuel system between the solenoid valve and the
engine. Use caution when loosening fittings, as
a small amount of gas may leak out.
7.
Put a clean receptacle under the filter assembly.
Using a 1-1/4-inch wrench, unscrew the filter
bowl from the filter housing.
8.
Remove and discard the filter element.
9.
Install a new filter element in the filter housing.
10. Inspect the O-ring on the filter housing for dam-
age or cracks. If necessary, replace the O-ring.
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1
2
3
3
1.
Frame Rail
2.
CNG Fuel Cylinder Storage Box
3.
Mounting Bolts (qty 12 per side)
Fig. 7, Fuel Cylinder Storage Box Mounting Bracket
(passenger side shown)
H IG
H PRESSURE
PRESS
UR
E
LOW
CYLINDERS
INSPECT CYLINDERS
EVERY 36 MONTHS
OR 36000 MILES
WHICHEVER OCCURS FIRST
NATURAL
GAS
VEHICLE
110 PSIG
ON
M
A
N
U
A
L
S
H
U
T
O
FF
V
A
LV
E
OPEN VALVE
SLOWLY
3600 PSIG MAX.
SERVICE PRESSURE
REGULATOR
FILTER
INSPECT PRESSURE
RELIEF DEVICE
EVERY 2000 MILES
DRAIN HOUSING
EVERY 1500 MILES
REPLACE ELEMENT
EVERY 3000 MILES
1
2
3
4
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f470556
1.
High Pressure Gauge
2.
Low Pressure Gauge
3.
Manual Fuel Shutoff Valve
4.
Fuel Fill Port and Dust Cap
Fig. 8, CNG Fuel Panel
Fuel
47
Business Class M2 Maintenance Manual, August 2015
47/9
11. Install the filter bowl on the filter housing. Tighten
90 lbf·ft (122 N·m).
12. Close the bleed valve on the manifold and open
the manual fuel shutoff valve on the fuel panel.
13. Open the fuel cylinder shutoff valves.
14. Using a methane detector, leak test all fuel sys-
tem components between the fuel cylinders and
the solenoid valve. A bubble solution can be
used to pinpoint the exact location of leaks.
Repair or replace any leaking components.
15. Using the two capscrews removed previously,
install the access cover on the fill panel.
47–07 CNG Fuel Cylinder
Inspecting
Have a qualified inspector inspect compressed natu-
ral gas (CNG) fuel cylinders for damage or deteriora-
tion. Note cuts, cracks, gouges, abrasions, discolor-
ation, broken fibers, loose brackets, damaged
gaskets or isolators, heat damage, or other prob-
lems.
Refer to Compressed Gas Assocation (CGA) pam-
phlet C-6.4, Methods for External Visual Inspection of
Natural Gas Fuel Containers and Their Installations,
for inspection requirements and inspector qualifica-
tions.
For more information, go to
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f470554
1
2
3
4
5
7
8
6
1.
Fuel Cylinder Storage
Box
2.
Fuel Cylinder Shutoff
Valves (qty 5)
3.
High-Pressure Gauge
4.
Low-Pressure Gauge
5.
Fuel Fill Port
6.
Dust Cap
7.
Manual Shutoff Valve
8.
Fuel Panel Access
Door
Fig. 9, CNG Fuel Cylinder Storage Box (5-cylinder
system shown)
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f470557
2
2
3
4
5
6
7
8
1
1.
Fuel Panel Access
Cover
2.
Capscrews (qty 2)
3.
Wiring Harness
4.
Pressure Relief Valve
and Cap
5.
Coolant Outlet Line
6.
Coolant Inlet Line
7.
Fuel Inlet Line (to fuel
cylinders)
8.
Fuel Outlet Line (to
engine)
Fig. 10, CNG Fuel Panel Assembly
Fuel
47
Business Class M2 Maintenance Manual, August 2015
47/10
After inspection, an accurate and reliable written re-
port should be provided for each container inspected.
Place an inspection label stating the inspection date
and inspecting agency identification on each con-
tainer.
05/04/2010
f470558
6
7
8
9
10
11
12
13
14
1
2
3
4
5
1.
Coolant Inlet Port
2.
Coolant Outlet Port
3.
Pressure Relief Valve
4.
Pressure Regulator
5.
Wiring Harness
6.
Manifold Bleed Valve
7.
Manifold
8.
Manual Fuel Shutoff
Valve
9.
Fuel Fill Port
10. Filter Housing
11. Filter Bowl
12. Filter Drain Plug
13. Solenoid Valve
14. Fuel Line To Cylinders
Fig. 11, CNG Fuel Panel Components
Fuel
47
Business Class M2 Maintenance Manual, August 2015
47/11
Title of Maintenance Operation (MOP)
MOP Number
CAT CGI Bellows Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49–03
CAT CGI Bellows and Piping Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49–02
Exhaust System Inspecting (Noise Emission Control). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49–01
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust
49
Index, Alphabetical
Business Class M2 Maintenance Manual, November 2015
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