Momentum MN 39 Series User manual

Published June 1, 2017
U-0181-MFT Series MN 39
OPERATORS MANUAL – MN 39 SERIES

Momentum Fuel System
MN 39 Series
Fuel Management Module
Revision 2A 01 Jan 2017

MN 39 Series Stand Alone FMM i
I. Legal Disclaimer
All information and illustrations in this manual are
the property of Momentum Fuel Technologies. Any
photographs or graphics presented in this manual are for
representational purposes only. All content is based on
the latest information available at the time of publishing.
As part of our continuous product improvement policy,
we may modify information, illustrations, and/or
specications to explain and/or exemplify a product,
service, or maintenance improvement. We reserve the
right to make any change at any time without notice.
No part of this publication may be reproduced or used in
any form without the without the written permission of
Momentum Fuel Technologies.
II. Preface
This manual is for Stand Alone Fuel Management
Modules (FMM) MN 39 Series. Service information is
available by calling Momentum at 1-844-CNG-TANK.
DO NOT attempt to fill, defuel, vent, or perform basic
maintenance on the system until you have read and fully
understand the information presented in this manual.
If you have questions about any part of this manual,
contact Momentum at 1-844-CNG-TANK.
This manual must always be kept in the vehicle so it
is accessible to the operator at all times. This manual
includes information that is important for the safety of the
operator and First Responders (i.e. police, re ghters) in
the event of an emergency.
The following abbreviations are used throughout this
manual:
1. CNG, which means Compressed Natural Gas.
2. FMM, which means Fuel Management Module
III. Warning Statements
Warning statement denitions used in this
manual.
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury. The word
“DANGER” applies to the most extreme situations.

ii MN 39 Series Stand Alone FMM
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation or unsafe practice
which, if not avoided, could result in minor or
moderate injury.
NOTICE
Indicates practices not related to personal injury. The
safety alert symbol shall not be used with this signal
word.

MN 39 Series Stand Alone FMM iii
Table of Contents
In Case of Emergency .................................................... 1
Fuel System Shut Down Procedure................................... 1
Location of Manual Shut-Off Valves ................................ 1
If You Suspect a Fuel Leak ................................................4
If the Vehicle is Involved in an Accident...........................4
If the Vehicle is on Fire...................................................... 5
First Responder Alerts and Procedures ...........................6
Fire Response Guidelines ..................................................6
Safety..................................................................................9
Safety Tips........................................................................ 10
CNG Vehicle Safety Precautions.......................................11
Codes and Compliances................................................... 12
Introduction .................................................................. 13
System Overview.............................................................. 13
Compressed Natural Gas................................................. 13
Fuel Standards................................................................. 14
Specications ................................................................... 14
Components..................................................................... 14
Inspection and Operation .......................................... 19
Pre-Trip Inspection ......................................................... 19
Weekly System Inspection............................................... 19
Starting the Vehicle .........................................................20
Fueling ............................................................................20
Fueling the CNG System.................................................. 21
Fast and Slow Fill and Pressure/
Temperature Guidelines..................................................24
Defueling and Fuel Transfer Guidelines .........................25
Fuel System Defueling Procedure ................................... 27
Scheduled Maintenance..............................................28
Maintenance Schedule.....................................................28
Maintenance Part Numbers ............................................29
Depressurizing Procedure ...............................................30
Re-pressurizing Procedure..............................................30
High Pressure Filter Drain Procedure ............................ 31
High Pressure Filter Change Procedure.......................... 31
Cylinder and Fuel System Inspections............................32
Periodic In-Service Inspection Requirements ...............32
Welding and Hot Work Procedures ...............................33

iv MN 39 Series Stand Alone FMM
CNG Decals ........................................................ 34
CNG Labels ......................................................................34
Towing and Lifting........................................................35
Lifting the Vehicle............................................................35
Towing the Vehicle ..........................................................35
Service and Support.....................................................36
Momentum Parts and Service Hotline ...........................36
Dealer Locator ................................................................36
Warranty.........................................................................37
Warranty Procedures....................................................... 37
Warranty Statement ....................................................... 37

MN 39 Series Stand Alone FMM 1
Section 1 — In Case of Emergency
In Case of Emergency
Natural Gas Vehicles (NGVs) are subject to the
requirements of the National Fire Protection Association
(NFPA). NFPA 52, the Vehicular Gaseous Fuel Systems
Code, details the safety requirements for NGVs and their
fueling facilities.
Fuel System Shut Down Procedure
In the event of an emergency or the vehicle requires
service, shut down the CNG fuel system using the
procedure below.
Location of Manual Shut-Off Valves
(Figure 1)
•Red Handle on the Fuel Management Module
(FMM)
FMM
MANUAL
SHUT-OFF
VALVE
FIGURE 1 – MANUAL SHUT-OFF VALVES

2 MN 39 Series Stand Alone FMM
Section 1 — In Case of Emergency
Step 1 – Turn OFF the Fuel Management Module
(FMM) Manual Shut-Off Valve
The FMM Manual Shut-Off Valve isolates the fuel storage
system from the engine. The FMM Manual Shut-Off Valve
is RED and clearly labeled for easy identication.
(Figure 2)
To turn OFF the FMM Manual Shut-Off Valve:
1.
2.
Turn the ignition OFF and set the parking brake. Do
not set the parking brake if the vehicle is being towed.
Open the fuel access door and locate the red Manual
Shut-Off Valve.
3. Turn the valve clockwise 1/4 turn to the OFF position.
Step 2 – Turn OFF the Fuel Cylinder Manual Shut-
Off Valve(s)
The Fuel Cylinder Manual Shut-Off Valve on each tank
isolates the fuel inside that tank.
NOTE: The Fuel Cylinder Manual Shut-Off Valve is
designed so that it does not turn off pressure in the
Pressure Relief Devices (PRDs) lines. This is a safety
design so the CNG fuel system PRDs can still activate
when the valves are shut off.
1/4 TURN
FIGURE 2 – FMM MANUAL SHUT-OFF VALVE

MN 39 Series Stand Alone FMM 3
Section 1 — In Case of Emergency
To turn OFF the Fuel Cylinder Manual Shut-Off Valve:
1. Open the valve access cover to the fuel cylinder by turning the butterfly
bolts counterclockwise. Locate the Fuel Cylinder Manual Shut-Off Valve.
(Figure 3)
Turn the valve clockwise until handle stops. (Figure 4)
NOTE: Use this method to turn OFF the valve on EACH tank. (Figure 5)
FIGURE 4– CYLINDER MANUAL SHUT-OFF VALVE
2.
TURN
FIGURE 3 – CYLINDER MANUAL SHUT-OFF VALVE ACCESS COVER
FIGURE 5– CYLINDER MANUAL SHUT-OFF VALVE

4 MN 39 Series Stand Alone FMM
Section 1 — In Case of Emergency
If You Suspect a Fuel Leak
Compressed natural gas is flammable and explosive.
Serious personal injury can occur if leaking gas is
ignited. If you suspect a leak, do not operate the
vehicle. The vehicle must be inspected by a qualified
technician before being returned to operation.
If You Smell a “Rotten Egg” Odor
An odorant which smells like rotten eggs is added to
compressed natural gas to aid in detection of a leak. If
you notice this kind of lingering odor coming from your
vehicle, you may have a leak in the CNG fuel system.
NOTE: It is normal to detect this slight odor when the
fueling nozzle is being connected or disconnected during
the refueling process. The odor should quickly dissipate
when fueling has been completed.
Other Signs of a Fuel Leak
If you notice any of the following, you may have a leak in
the CNG fuel system:
• Frosting at suspected leak point
• Bubbling in wet area
• Blowing or hissing sound
• Flames, if a leak has ignited
If the Vehicle is Involved in an Accident
If the vehicle is involved in any accident or is leaking fuel,
perform the following procedure.
If the vehicle is involved in any accident occurring in
excess of 5 mph, the fuel system MUST be inspected
by a CSA-qualified fuel system inspector before being
returned to service.
1. Turn the ignition switch OFF, turn the main battery
OFF, and set the parking brake.