PEI GPRO QM40 User manual

921528-01 Rev. G
03/2022
General Information�������������������������������������� 2
Installation �������������������������������������������������������� 3
Operation ���������������������������������������������������������� 5
Calibration��������������������������������������������������������� 6
Maintenance ���������������������������������������������������� 6
Troubleshooting ��������������������������������������������� 7
Specications��������������������������������������������������� 8
Informative Table - Diesel����������������������������9
Informative Table - Unleaded������������������ 10
Illustrated Parts List �������������������������������������12
Parts and Service ������������������������������������������17
TABLE OF CONTENTS
SAVE THESE INSTRUCTIONS
QM40 Positive Displacement Fuel Meter
Owner’s Manual
To the owner…
Congratulations on receiving your
GPRO® QM40 Meter� We are pleased to
provide you with a meter designed to give
you maximum reliability and eciency�
Our business is the design, manufacture
and marketing of liquid handling,
agricultural and recreational products� We
succeed because we provide customers
with innovative, reliable, safe, timely and
competitively-priced products� We pride
ourselves in conducting our business with
integrity and professionalism�
We are proud to provide you with a quality
product and the support you need to
obtain years of safe, dependable service�
Great Plains Industries, Inc� is a member
of the Petroleum Equipment Institute.
Victor Lukic, President
Great Plains Industries, Inc�

2
GENERAL INFORMATION
The purpose of this manual is to
assist you in installing, operating and
maintaining your mechanical fuel meter�
Please take a few moments to read
these instructions before installing and
operating your fuel meter�
SAFETY INSTRUCTIONS
The following safety alert symbols are
used in this manual�
DANGER
DANGER indicates a hazardous
situation which, if not avoided, will
result in death or serious injury.
WARNING
WARNING indicates a hazardous
situation which, if not avoided, could
result in death or serious injury.
CAUTION
CAUTION indicates a hazardous
situation which, if not avoided, may
result in minor or moderate injury.
It is your responsibility to:
• Know and follow applicable na-
tional, state and local safety codes
pertaining to installing and operat-
ing equipment for use with flam-
mable liquids�
• Know and follow all safety precau-
tions when handling petroleum
fuels
• Ensure that all equipment op-
erators have access to ade-
quate instructions concerning
safe operation and maintenance�
Appropriate Use of QM40 Meter:
1�
WARNING
This meter is for use
only with thin viscosity petroleum
fuels such as gasoline, gasoline-eth-
anol blends (up to E15), diesel, diesel
blends (up to B20), kerosene, aviation
gasoline AVGAS 100LL, and Jet A�
2�
DANGER
Observe precau-
tions against re or explosion when
dispensing fuel� Do not operate the
meter in the presence of any source
of ignition including running or hot
engines, lighted cigarettes, or gas
or electric heaters�
3�
WARNING
Any components
such as hose, nozzle, or pump
added to your meter must be stati-
cally grounded and approved for
use with petroleum fuels�
4�
WARNING
Avoid prolonged
skin contact with petroleum fuels�
Use protective goggles, gloves,
and aprons in case of accidental
splashing or spillage� Change
saturated clothing and wash skin
contact areas promptly with soap
and water�
This meter is designed for the eld
measurement of thin viscosity petro-
leum fuels only and intended for use
with pump systems up to 40 GPM
(150 LPM) ow range (not intended
for gravity ow systems)� Using me-
chanical gears, these meters translate
ow data from positive displacement
oval gears into calibrated units which
are indicated on the face of the meter�
This meter is factory calibrated for
diesel fuel� Field calibration feature is
available for other uids, see Calibra-
tion section�
AVIATION NOTE:
QM40 is approved for ground-based re-
fueling only� Do not use in or on aircraft�
Please consult NFPA 407 for recom-
mended safety requirements during
ground fuel servicing of aircraft using
petroleum fuels�

3
INSTALLATION
Before installing your meter, review
the safety instructions given above�
Examine your meter to make sure
there are no visible signs of shipment
damage� Plan your meter installation
by reviewing the following procedures�
Your system must be mounted on a
vented tank� If the tank is unvented,
your local dealer or distributor can
supply a pressure cap�
If the meter is located in a rigid piping
system where the fluid is trapped
(for example, by gravity, valves or
nozzles) thermal expansion of the uid
can create pressure spikes that can
damage a meter� Install a thermal relief
valve or otherwise allow for thermal
expansion of the uid�
The flowmeter MUST be mounted so
that the rotor shafts are in a horizontal
plane� Mounting the meter with the
mechanical display facing horizontally
will orient the rotor shafts correctly�
The mechanical display should never
face upwards or toward the ground�
The weight of the rotors must be
supported by the horizontal rotor shafts�
If installed incorrectly, performance,
life or accuracy could be affected�
(see Figure 1)
Liquid can ow in a horizontal direction,
or a vertical direction, but in each case
the rotor shafts must be in a horizontal
plane�
It is preferred to install the flow-meter
upstream of a flow control or shut-off
valve, as the back pressure provided
by the valve will be benecial to system
accuracy� The flow meter should
remain full of liquid at all times when
connected�
Do not operate the ow-meter directly
discharging to the atmosphere�
Prior to installation, determine whether
horizontal or vertical ow is required�
For vertical ow installations the liquid
should travel from bottom to top, i�e�
it should rise vertically through the
flow-meter� This will ensure that the
flow-meter remains full of liquid, and
will prevent air entrapment in the meter�
The back of the meter housing is
embossed with “INLET” and “OUTLET”
adjacent to its respective port to assist
in correct piping connections�
gure 1
Correct
Horizontal Flow
Vertical Flow
InCorrect
Correct

4
QM40 Modular Congurations
outlet adapter/o-ring/bolts
inlet adapter/o-ring/bolts
The QM40 includes adapter plates, o-rings, and
bolts for use with threaded pipe.
90° outlet adapter/o-ring/bolts
Without the inlet adapter plate, the QM40 can be bolted
directly to the outlet of a GPI or GPRO pump featuring
a modular outlet. Bolt modular accessories to the
outlet of the QM40 or use the outlet adapter plate for
threaded pipe.
pump with modular outlet
90° outlet adapter/o-ring/bolts
modular lter adapter/o-rings/bolts
pump with modular outlet
Use a GPI modular lter adapter to include a lter
into your system
gure 4a
gure 4b
gure 4c

5
Changing Display Orientation
The mechanical display case can be
removed, rotated and reinstalled for easy
reading with either horizontal or vertical
ow (see Figure 2)
1� Using a 5mm hex wrench, remove
the (4) M6 socket screws from back
of housing�
2� Without separating the housing from
the mechanical display, sit the meter
face up
3� Lift the mechanical display from the
housing, rotate to desired orienta-
tion and place back on to housing
Note: Ensure bevel gear is still present
on center drive shaft as bevel gear is
not retained, see Figure 2 for bevel
gear location
4� Reinstall the (4) M6 socket
screws and tighten to 42-46 lb-in
[4�7-5�2 N•m] torque�
DETAIL A
SCALE 2 : 1
A
M6 SOCKET SCREWS
4 EA.
M4 SOCKET SCREWS
4 EA.
gure 2
Meter Installation
1� Remove the protective plugs from
the meter inlet and outlet ports� The
inlet port has a 100 mesh stainless
steel conical strainer installed�
CAUTION
The mesh strainer must always be
installed when operating the meter;
otherwise, particles may enter the
meter chamber and disrupt the
smooth operation of the oval gears�
2� Wrap threaded male connections
with thread tape or use a pipe
sealant compound compatible with
petroleum fuels�
3� Install the meter on the pump us-
ing an appropriately sized nipple�
The bottom of the meter housing
is embossed with “INLET” and
“OUTLET” adjacent to its respec-
tive port to assist in correct piping
connections�
4� Install other system components
onto the meter and tighten�
OPERATION
ALWAYS FOLLOW SAFETY PRECAUTIONS
WHEN OPERATING THIS EQUIPMENT�
REVIEW THE SAFETY INSTRUCTIONS�
Before each use, visually check the meter
to ensure it is securely connected to
other system components and there is no
leakage� Promptly wipe spilled fuel from
the meter’s exterior and other system
components�
The large meter display represents
the Batch Total for each fuel delivery�
Before dispensing, reset the Batch
Total to zero by turning the knob� (see
Figure 3)
KNOB
BATCH TOTAL
CUMULATIVE TOTAL
gure 3
The small display represents the
Cumulative Total of all fuel deliveries
and cannot be reset�

6
CALIBRATION
The meter is accurately calibrated at the
factory for use with diesel fuel� Due to
differences in viscosity and flow rates,
the meter may require recalibration
to measure other fuels or to adjust for
inaccuracies� A gear replacement kit is
available to convert the meter to unleaded
fuels� (PN 139500-15, see Illustrated Parts
List section)
1� To adjust the calibration of the me-
ter, gain access to the calibration
screw by performing the following:
(see Figure 4)
2� Remove the back plate and the
(4) screws retaining it� The O-ring
seal under the plate must not be
damaged�
3� Using a 5MM hex L-wrench, adjust the
calibration screw as required�
4� Note: The calibration screw set-
ting may have been adjusted at
the factory� The gasoline setting
is approximately fully closed (turn
clockwise)� Do not overtighten the
screw against the seat�
CALIBRATION SCREW
gure 4
5� Reinstall the plate, (4) screws
and the O-ring seal if removed�
Tighten (4) screws to 42-46 lb-in
[4�7-5�2 N•m] torque�
MAINTENANCE
The meter’s strainer should be cleaned
at regular intervals, especially if reduced
ow is encountered�
Clean or Replace Strainer
1� Remove the socket screws at the
inlet fitting� Remove the fitting, O-
ring and strainer� (see Figure 5)
STRAINER SKELETON
STRAINER
gure 5
2� The strainer rim is pressed into the
housing inlet but can be removed
by carefully grasping the end with
pliers and pulling with a wiggling
motion until free�
3� Using a ne brush, clean the strainer�
Replace the strainer as necessary�
4� Wipe the housing inlet clean and
reinstall strainer, pressing it into
the strainer bore� It is designed to
be field pressed back into place
using the end of a clean 1” pipe
nipple or similar tube tool using light
hammer taps�
CAUTION
The mesh strainer must always be
installed when operating the meter;
otherwise, particles may enter the
meter chamber and disrupt the
smooth operation of the oval gears�
5� Wipe clean the fitting and O-ring
groove� Coat the O-ring with oil or
light grease and seat into the tting
groove�
6� Reinstall the inlet tting and screws�
Tighten screws to 42-46 lb-in
[4�7-5�2 N•m] torque�

7
TROUBLESHOOTING
Symptom Probable Cause Corrective Action
A� Meter counter does
not operate� (Normal
fuel ow)
Broken counter
assembly�
Replace counter�
Counter alignment Look for loose or
missing fasteners, bent
or misaligned parts�
Foreign material in
counter assembly�
Remove and clean
counter assembly�
Missing or worn bevel
gear�
Replace bevel gear�
B� Meter counter does
not operate�
(Little or no fuel ow)
Clogged strainer in
meter inlet�
Clean or replace
strainer
Jammed rotors from
foreign material in rotor
assembly�
Remove and clean rotor
assembly�
Other system
components
malfunctioning�
Check all system
components tank to
nozzle for clogs and/or
malfunctions� Repair as
necessary�
C� Fuel leakage� Leakage between
coverplate and housing�
Remove coverplate and
inspect for damaged,
missing or incorrectly
seated seal� Replace
as required�
Leakage at ttings Remove ttings and
inspect for damaged,
missing or incorrectly
seated seals� Replace
as required�
Leakage at threads� Remove meter and
reseal all threaded
connections with thread
tape or pipe thread
sealing compound
approved for use with
ammable liquids�

8
SPECIFICATIONS
Gallon Models Litre Models
Model
Designation QM40-G8N QM40-L8N
Unit of Measure U�S� Gallon Litre
Flow Range 2 to 40 GPM 8 to 150 LPM
Typical Accuracy
(Factory Set)1
Diesel: ±0�5% (15-30 GPM/57-113 LPM)
±1�0% all other flowrates
Unleaded: +0�5% to -1�5% (15-30 GPM/57-113 LPM)
±2�0% all other flowrates
Typical Accuracy
(Field/Customer
Set)1
Diesel: ±0�25% at a given flow (15-30 GPM/57-113 LPM)
±0�5% all other given flows
Unleaded: ±0�5% at a given flow (2-23 GPM/8-87 LPM)
±0�5% at a given flow (23-40 GPM/87-150 LPM)2
Resolutional
Error (Display)
(0�01/Dispensed
Amount)*100
(0�1/Dispensed
Amount)*100
Operating
Temperature -20°F to 125°F -29°C to 52°C
Maximum Work-
ing Pressure 50 PSIG / 3�4 Bar
Wetted Materials:
Housing / Cover
/ Fittings Aluminum
Rotors PPS (Polyphenylene Sulde)
Shafts / Strainer Stainless Steel
Seals NBR (Nitrile Butadiene Rubber)
Mag-Drive Acetal, Stainless Steel and Neodymium (Nickel Plated)
Inlet/Outlet Ports 1" NPT (female) 1" NPT (female)
Pressure Drop
(at Max� Flow)
Diesel: 7�0 PSI / 0�5 Bar
Unleaded: 4�5 PSI / 0�3 Bar
Maximum
Batch Total 999�9 9999
Maximum
Cumulative Total 9,999,999�9 99,999,999
Technology Positive Displacement
1
Results may vary due to application variations�
2
Unleaded Fuel Kit required (Part No� 139500-15)
Note: Field Calibration is available on all models.

9
0 1 2 3 4 5 6 7 8
-1.5 -1.0 -0.5
0.0 0.5 1.0 1.5
0 5 10 15 20 25 30 35 40
PRESSURE DROP PSI
ERROR %
FLOWRATE GPM
QM40 ACCURACY & PRESSURE DROP vs FLOWRATE - DIESEL
FACTORY SETTING NOMINAL UPPER RANGE FACTORY SETTING NOMINAL LOWER RANGE
CALIBRATION SCREW IN CALIBRATION SCREW OUT 2 TURNS PRESSURE DROP

10
*A gear replacement kit is available (P/N 139500-15) to convert the meter to unleaded fuels� Replacement gear kit will adjust entire ow curve up 1�5%�
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
-1.5 -1.0 -0.5
0.0 0.5 1.0 1.5 2.0
0 5 10 15 20 25 30 35 40
PRESSURE DROP PSI
ERROR %
FLOWRATE GPM
QM40 ACCURACY & PRESSURE DROP vs FLOWRATE - UNLEADED
SCREW IN ORIGINAL EQUIPMENT SCREW IN WITH GEAR KIT SCREW OUT 2 TURNS WITH GEAR KIT PRESSURE DROP