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
damage or cracks. If necessary, replace the
O-ring.
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
system 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.
04/22/2010 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. 11, CNG Fuel Cylinder Storage Box (5-cylinder
system shown)
05/04/2010 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. 12, CNG Fuel Panel Assembly
Fuel47
Business Class M2 Plus Maintenance Manual, 02/10/202347/10
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