4.
Install the new element, the element retainer, the
bowl, and the bowl nut.
5.
Turn the fuel supply on at the tanks.
47–06 CNG Low-Pressure Fuel
Filter 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.
Drain the fuel filters, which are mounted on the left-
hand frame near the fuel regulator, by removing the
drain nut located at the bottom of the housing of
each filter.
Perform this maintenance procedure as indicated in
the maintenance interval chart in this manual.
47–07 CNG Fuel Tank Visual
Inspection
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.
Each fuel tank must be visually inspected at speci-
fied intervals for external damage and deterioration.
The inspection must be performed by a qualified per-
son, in accordance with the manufacturer’s estab-
lished reinspection criteria and Compressed Gas As-
sociation documents.
Perform this maintenance procedure as indicated in
the maintenance interval chart in this manual. See
for the remedies to any damage found on
the tank. See
Group 47
of the
Walk-In Van Chassis
Workshop Manual
for tank repair procedures, or take
the vehicle to an authorized Freightliner dealer.
CNG Tank Visual Inspection
Damage
Condition
Remedy
Abrasion on the Fiberglass
Wrap
Less Than 0.010 Inch (0.3 mm) Deep
No repair needed.
More Than 0.010 Inch (0.3 mm) But Less
Than 0.030 Inch (0.8 mm) Deep
Repair.
More Than 0.030 Inch (0.8 mm) Deep
Replace tank.
1
2
3
4
5
08/23/96
f470238
1.
Fuel Filter Head
2.
Filter Element
3.
Element Retainer
4.
Filter Bowl
5.
Bowl Nut
Fig. 2, CNG Low-Pressure Fuel Filter Assembly
Fuel
47
Walk-In Van Chassis Maintenance Manual, June 2021
47/3
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