an ISO 9001:2008 certified company
Discontinued
Model 710 Wall Mount
Fuel Measurement System
Instruction Manual
The Max 710 Fuel Measurement
System provides a solution to the
many inherent problems involved in
the accurate measurement of vehicle
fuel consumption. These include:
vapor elimination, high return fuel
temperatures, pressure regulation and
overall plumbing considerations. The
Max 710 is equipped with a Model 213
Flow Meter and can measure up to 175
lbs/hr (1800 cc/min). These systems are
compatible with gasoline, diesel fuels, or
alcohol.
710-2XX-350 (S/N D03333 and up) Rev. 8/2010© 2007-10, Max Machinery, Inc.
Table of Contents
Discontinued
General Description .........................................3
Specifications
Fuel Conditioner Unit
Installation
Trouble Shooting
Wiring & Schematic
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710-2xx ..........................8
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Max Machinery, Inc. reserves the right to make changes to the product in this Instruction Manual to improve performance, reliability, or
manufacturability. Consequently, contact MMI for the latest available specifications and performance data. Although every effort has been
made to ensure accuracy of the information contained in this Instruction Manual, MMI assumes no responsibility for inadvertent errors.
2
General Description
Discontinued
The Max 710 Fuel Measurement System is
engineered to provide a solution to the many
inherent problems involved in the accurate
measurement of vehicle fuel consumption.
These include: vapor elimination, high return
fuel temperatures, pressure regulation and
overall plumbing considerations. The Max 710 is
equipped with a Model 213 Flow Meter and can
measure up to 175 lbs/hr (1800 cc/min). These
systems are compatible with gasoline, diesel
fuels, or alcohol.
The Max 710 is enclosed in a wall mount cabinet
consisting of a fuel conditioning/metering
package and an optional electronic display.
The fuel conditioner contains a filter, vapor
eliminator, level controller, flow meter, heat
exchanger, two pumps, two regulators, pressure
relief valves, several pressure gauges and three
RTD’s. An optional display is available based
on the Max Model 121 indicator and provides
flow rate indication, a totalizer, temperature/
specific gravity display and an analog output
proportional to the rate display.
In operation, the transfer pump draws fuel
from the vehicle tank through the FROM TANK
connector. A 20 PSI regulator maintains a
steady pressure for the vapor eliminator and
flow meter. The excess fuel is used for the heat
exchanger cooling, prior to being returned to
the vehicle fuel tank via the To Tank connector.
The purpose of the transfer pump is to provide
optimum pressure to operate the flow meter and
to overcome the fluid resistance of the system.
The fuel pressure to the engine (To Engine
connector) is regulated by a 125 PSI regulator,
(Supply Pressure Adjust) and monitored on the
Supply pressure gauge. This pressure is set as
required by the engine fuel pump, carburetor or
injector. The Fuel returning from the engine is
monitored on the Return Pressure gauge.
Separate manuals are available for many of
the individual components of the 710 System,
and can be found on our website at www.
maxmachinery.com.
Specifications
Range
213 Flow Meter 0.12 to 175 lbs/hr (1 to 1800 cc/min.)
Model Options
Fuel-to-Fuel Heat Exchanger
Coolant-to-Fuel Heat Exchanger
Accuracy
Gasoline/Diesel/Alcohol +/- 0.2% or better
Fuel Compatibility
710-2XX Gas, Diesel, Alcohol
Engine Type
Carbureted or Fuel Injected
Temperature Range
Operating 14° to 140°F (-10° to 60°C)
Storage -14° to 160°F (-26° to 70°C)
The level controller combines fuel from the flow
meter and cooled return fuel from the engine
via the FROM ENGINE CONNECTOR. At this
point, a second fuel pump can be activated by
placing the front panel toggle switch in the “On”
position. This pump is generally used when the
vehicle’s fuel pump is either bypassed or located
before the Max 710 Unit (typically in the tank).
Power Requirements
12Vdc @ 15mA
Size (approximate)
24 x 30 x 8 inches (61x76x20 cm)
Weight (approximate)
90 lbs. (40.8 kg)
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Fuel Conditioner Unit
Discontinued
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16
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5b
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5a
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1. Engine and Tank Connections: Hoses attach to
these fittings to carry fuel to and from the tank.
2. Fuel Filter: Filters the fuel entering the 710
system. The filter element replacement kit #381102-705 is available from the factory.
3. Transfer Pump: This pump draws fuel from
the vehicle fuel source and pressurizes the flow
meter. It also pumps fuel through the cooling
side of the heat exchanger.
4. Inlet Pressure Regulator: Typically set to 17
PSI. This is the optimum pressure for operation
of the vapor eliminator and flow meter.
5. Inlet Pressure Gauge (a): Typically reads 17
PSI. Set with Item 4.
Inlet Pressure Gauge (b): Pressure prior to
transfer pump.
6. Vapor Eliminator: Eliminates air vapor
from the fuel prior to the flow meter, to avoid
measurement errors. See manual 372-100-350 or
370-100-350.
4
Fuel Conditioner Unit (continued)
Discontinued
7. Flow Transmitter: Converts the mechanical
motion of the flow meter to electronic pulses,
which are used by the Indicator Unit. See Manual
294-000-350.
8. Flow Meter: Fuel flowing through the meter
causes the movement of four pistons, which
are linked to a rotating magnet. This magnet is
sensed by the flow transmitter. See Manual 210000-350
13. Supply Fuel Pressure Gauge: Reads pressure
to engine carburetor or
injector. Set by Item 12.
14. Vent Connector: Operation of the vapor
eliminator and level controller separate out the
fuel vapors, which must be vented to the fuel
tank.
15. Output Signal Wires: Wires used to interface
to an indicating unit.
9. Level Controller: This functions as an on board
storage tank for the fuel returning from the
engine and makeup fuel from the flow meter. See
Manual 370-000-350
10. Supply Pump: This pump is on when the
Recirculation Pump switch is in the “ON”
position. It is used when necessary to supply
working high pressure to the engine.
11. Pump Selector Switch: See 10.
12. Supply Fuel Pressure Regulator: Adjusts the
secondary pump pressure
from 0 to 100 PSI. (CW = more pressure)
16. Power Connector: Connection for 12 VDC
power source.
17. Fuse: 20 Amp fuse protection for the fuel
Conditioner.
18. Kill Switch: This spring loaded switch is held
closed with a thermoplastic line. In case of fire,
the line will melt, the switch will open and the
power to the System will be interrupted. This will
deactivate the fuel pump(s).
19. Heat Exchanger: Used to cool the fuel
returning from the engine (with fuel from the
vehicle tank). This eliminates problems with hot
or boiling fuel.
5
Installation Overview
Discontinued
Description
Hoses are run to the fuel tank and engine. The
normal connection to the engine must be broken
to allow the Max 710 to be inserted in the fuel
path. If the normal fuel pressure is not known at
this point, it is a good idea to insert a pressure
gauge and determine the line pressure.
Step - by - Step Installation Instructions
1. Start with the Supply Pressure knob fully
unscrewed, CCW (minimum pressure).
2. Connect the fuel lines:
FROM TANK goes to the fuel source (tank).
Place hose in the fuel.
The Model 710 can be used in two modes
First Operating Mode
The first operating mode activates only the
transfer pump and the vehicle fuel pump draws
fuel from the conditioner as it would from
the vehicle fuel tank. In this case, the system
pressure is determined by the engine.
Second Operating Mode
In the second operating mode, both the transfer
and secondary pump are activated. The supply
pressure is set via the fuel conditioner regulator
to meet the engine specification. This mode is
generally used when the engine fuel pump is
bypassed or when there is a fuel pump located
upstream of the 710 (in tank or trunk mounted
pump). The secondary pump is used to boost the
pressure back to normal engine specification.
TO TANK goes to the fuel source (tank). Place
hose above the fuel level. This hose returns
unused fuel to the tank.
TO ENGINE goes to the fuel injector or
carburetor.
FROM ENGINE returns unused fuel from the
injector or carburetor to the Model 710 System.
VENT is routed to the fuel tank headspace.
COOLANT OUT/IN goes to recirculating coolant
source. (710-211 only)
3. Connect the flow meter signal and Power
cables:
a. The Interface cable runs between the
Conditioner and your Indicator or PLC.
b. Connect the power terminal to the
vehicle battery or power supply.
SELECT “ON” (1 pump) or “ON (Recirculation
Pump)” (2 pumps) mode
START THE VEHICLE. If using two pumps, set the
correct supply pressure.
Check carefully for any fuel leaks before starting
the tests.
NOTE: If the available current is insufficient, the
system fuse will blow. Turn off the power and
check the connections and the fuse if the unit
fails to operate.
6
Trouble Shooting Chart
Discontinued
Problem Cause Remedy
Pumps Not Running
Rate Indicator Or Totalizer Does
Not Indicate Flow
Temperature Reading Is
Incorrect Or Appears Incorrect
Return Pressure Greater Than
Zero
Supply Pressure Gauge Reads
High
Venting of Fuel
*Blown fuse(s)
*Electrical short
*Electrical open
*Dead battery
*String on kill switch broken
*No Fuel
*Filter plugged
*Crimped Hose
*Pump(s) not running
*Flow meter broken
*Transmitter broken
*Level Controller stuck shut
*Start switch defective
*Supply pressure regulator not set
*Pump switch set incorrectly.
*Calibration is wrong
*RTD is open
*Instrument cable open *Loose
connection *Programming not set
*A hose is pinched
*“To Tank” is not connected
*Level control, heat
exchanger, vent line,
pump, check valve or
piping blocked
*Restriction in line to
engine or from engine
*Defective Gauge
*Kinked line
*Level controller struck open
*Vapor eliminator stuck open
*Replace fuse(s)
*Isolate and repair
*Isolate and repair
*Charge or replace
*Check string and switch
*Fill Tank
*Clear filter
*Uncrimp hose
*Blown fuse needs replacing
Pump defective - replace
Loose Electrical Connection
Low Battery
*Check Flow meter
*Check Transmitter
*Repair
*Repair or replace
*Set Regulator
*Set correctly
*Check Programming
*Check wiring, replace RTD
*Check, repair or replace
*Check all connections
*Correct program choices
*Check hoses and uncrimp
*Connect line or monitor
temperature rise
*Find and clear blockage
*Clear restriction
*Replace gauge
*Remove kink
*Float and/or seat need alignment
*Float and/or seat need alignment
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Discontinued
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