freightliner Custom Classic MT45 2022, Maintenance Manual

Page: 116 / 138

Perform this maintenance procedure as indicated in
the maintenance interval chart in this manual.
47–04 CNG Fuel Block Housing
Draining
WARNING
Compressed natural gas is highly flammable. See
the safety precautions listed in Chapter 10 of the
Walk-In Van Chassis Operator’s Manual or Group
47 of the Walk-In Van Chassis Workshop Manual ,
or take the vehicle to an authorized Freightliner
dealer. Failure to observe these precautions could
lead to the ignition of the natural gas, which could
cause severe bodily harm, or death, or property
damage.
Shut off the fuel supply at the fuel tanks. Vent the
system.
Remove the drain nut at the bottom of the engine
internal fuel filter, which is mounted on the left-hand
side of the engine.
Perform this maintenance procedure as indicated in
the maintenance interval chart in this manual.
See the engine manufacturer’s operation and mainte-
nance manual for further information.
47–05 CNG Low-Pressure Fuel
Filter Replacement
WARNING
Compressed natural gas is highly flammable. See
the safety precautions listed in Chapter 10 of the
Walk-In Van Chassis Operator’s Manual or Group
47 of the Walk-In Van Chassis Workshop Manual ,
or take the vehicle to an authorized Freightliner
dealer. Failure to observe these precautions could
lead to the ignition of the natural gas, which could
cause severe bodily harm, or death, or property
damage.
The low-pressure fuel filter is located inside of the
left-hand frame rail, near the center of the fuel tank.
Turn the valve counterclockwise to close the filter
drain.
1. Shut off the fuel supply at the tanks.
2. Vent the fuel supply system.
3. After the system has been vented, remove the
filter bowl. See
Fig. 2 . Using a 26-mm wrench,
remove the bowl nut. Then remove the bowl, the
element retainer, and the filter element.
NOTE: Be sure that the O-ring is positioned
properly inside of the filter head.
08/26/96
f470239
1 2 3 4
5
1. Fuel Filter Head
2. Filter Element
3. O-Ring
4. Filter Housing
5. Filter Drain
Fig. 1, CNG High-Pressure Fuel Filter Assembly
Fuel
47
Walk-In Van Chassis Maintenance Manual, June 2021
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