Cng Fuel Leak Test; Cng High-Pressure Fuel Filter Draining; Cng High-Pressure Fuel Filter Replacement - freightliner Custom Classic MT45 2022 Maintenance Manual

Fuel
47–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine or motor, set the parking brake, and chock
the tires. Before working under the vehicle, always
place jack stands under the frame rails to ensure
the vehicle cannot drop. Failure to follow these
steps could result in serious personal injury or
death.
47–01 CNG High-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 high-pressure fuel filter is located inside of the
left-hand frame rail, near the rear of the fuel tank.
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 housing. See Fig.
4. Remove and discard the O-ring used to seal the
filter housing.
5. Remove and discard the filter element.
6. Install the new element and press it into place.
7. Install the new O-ring.
8. Apply a thread lubricant to the housing threads,
and screw the filter housing onto the filter head.
9. Check for leaks using a natural gas detector.
10. Tighten the filter housing.
Walk-In Van Chassis Maintenance Manual, June 2021
1.
11. Turn the fuel supply back on at the tanks.
47–02 CNG Fuel Leak Test
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.
Inspect and test the fuel tanks and the fuel lines. Use
a natural gas detector to check for any leaks.
Replace leaking fuel tanks; repair or replace any
lines or connections that are leaking. For procedures,
see Group 47 of the Walk-In Van Chassis Workshop
Manual, or take the vehicle to an authorized Freight-
liner dealer.
Safety precautions are listed in Group 47 of the
Walk-In Van Chassis Workshop Manual.
47–03 CNG High-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. Vent the
system.
Drain the fuel filters, which are mounted on the left-
hand frame rail of the vehicle near the fuel regulator,
by removing the drain nut located at the bottom of
the housing of each filter.
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