Issued June 2020
Compressed Natural Gas (CNG) Option
Copyright 2020, Heil Environmental
Printed in U.S.A.
214
FUEL SYSTEM SHUT DOWN PROCEDURE
1. Turn OFF the Fuel Management Module (FMM)
Manual Shut-Off Valve.
2. Turn OFF the Fuel Cylinder Manual Shut-Off Valve
on EACH tank.
CNG VEHICLE OPERATOR EMERGENCY
RESPONSE
WARNING
During an emergency situation, never jeopardize safety to
shut down the system. If it becomes evident that the steps
cannot be safely completed, move to a safe distance, call
9-1-1 and alert emergency personnel of the situation,
informing them of the presence of a CNG system and that
it is not properly shut down.
Emergency Response for Gas Leaks
If the vehicle has sustained damage or a gas leak is
detected:
1. Do not approach the vehicle if any sources of ignition
may exist such as fire, sparks, electrostatic charges,
lights or electronic devices.
2. If the vehicle is indoors, move the vehicle outside and
away from any ignition sources.
3. Do not use road flares.
4. Do not smoke or allow anyone else to smoke near
the vehicle.
5. Turn OFF the ignition switch, set the parking brake
and turn OFF the battery at the main disconnect.
6. If it is safe to do so, turn OFF the Fuel Management
Module Manual Shut-Off Valve and turn OFF the
Fuel Cylinder Manual Shut-Off Valve on EACH tank.
Check the fuel system near the damaged area for
leaks by smell, sight, and sound. CNG is odorized
and can be detected by smell.
7. Keep traffic and pedestrians away.
8. Beware that gas may continue to leak once ignition is
turned off and the manual shutoff valves are closed.
9. Have a qualified technician verify leak locations with
suitable methane detection fluid.
10.Have the leaks repaired by a qualified technician
immediately.
Vehicle Fire Procedures
In the event of a CNG fire, it is imperative that the vehicle
operator acts quickly:
1. Get passengers out of the vehicle as quickly as
possible.
2. Evacuate the area.
3. Call 9-1-1.
4. If possible without putting yourself in harm’s way,
dump the refuse load from the body and move the
vehicle a safe distance away from any burning
refuse.
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