Vapor Eliminator
Level Controller
Operational Manual
For Models
370 & 372
370 Series
Fuel Measurement Accessories
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
INSTRUCTION MANUAL
370 Series Fuel Metering Accessories
TABLE OF CONTENTS
370 Series
Vapor Eliminator
General Description/Specifications ......................page 3
Vapor Eliminator — Drawings ...........................page 5
Vapor Eliminator — Performance Curves .................page 6
Level Controller
General Description/Specifications ......................page 7
Level Controller — Drawings ............................page 8
Level Controller — Performance Curves ..................page 9
372 Series
Vapor Eliminator and Level Controller
General Description/Specifications .....................page 10
Sectional Drawing.................................... page 12
Perfomance Curves ...............................pages 12-13
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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Model 370
Vapor Eliminator — General Description/Specications
The Vapor Eliminator is an in-line self-venting chamber which is used in both portable and stationary Max fuel-measurement systems. It is placed directly upstream of the flowmeter- separating gases resulting from the “boiling” of
low vapor pressure fuels, and removing air bubbles resulting from aeration of the fuel tank, or leaks on the suction
side of the pump. It ensures that the flowmeter measures liquids only.
Specifications
Materials of construction:
Body 303 Stainless
Valve Orifice 303 Stainless
Valve Seal Special Nitrile
Float 304 Stainless
Miscellaneous Levers 304 Stainless
Screens 304 Stainless
Volume (approximately) 202 cc’s
Maximum Inlet Flow rate (liquid plus entrained gases)*
Gasoline 5250 cc/min
Alcohol 4375 cc/min
Diesel 3500 cc/min
Maximum Operating Pressure 100 psi
Supply Line Size 1/4” or 3/8” tubing
Maximum Temperature of Fuel
Gasoline 130°F
Alcohol 140°F
Diesel 200°F
* NOTE: Flow rates approaching the maximum of the Inlet Port will reduce the vapor elimination capabilities.
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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Model 370
Vapor Eliminator — Application Description
The diagram below shows the arrangement of components in a typical fuel-measurement system. Note the proximity
of the vapor eliminator to the flowmeter. Note that the vapor vent line returns to the fuel tank; merging with the
vent line of the level control tank is an acceptable practice.
The Level Controller stores return fuel from the engine’s fuel injectors or carburetor and is replenished by fuel passing through the flowmeter. The controller operates at atmospheric pressure and will present no back pressure to the
return fuel line. Vapor elimination of this fuel is also accomplished by the controller’s internal screens.
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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Model 370 Vapor Eliminator — Drawings
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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Model 370 Vapor Eliminator — Performance Curves
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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Model 370
Level Controller General Description/Specications
Specifications
Materials of Construction:
Body 303 Stainless
Valve orifice 303 Stainless
Valve Seal Special Nitrile
Float 304 Stainless
Miscellaneous Levers 304 Stainless
Screens 304 Stainless
Maximum Fuel Flow Rate
Inlet Port (no vapor)*
Gasoline 2200 cc/min
Alcohol 2000 cc/min
Diesel 1500 cc/min
Return Port (< 1000 cc/minute vapor)*
Gas 3000 cc/min
Alcohol 2500 cc/min
Diesel 2000 cc/min
Supply Port
This is the tank outlet. The fuel drawn from the tank must not exceed
the sum of the inlet port flow, and return port flow.*
Maximum Inlet Fuel Pressure 20 psi
Volume (w/10 psi supply) 202.1 cc
Maximum Temperature of Fuel
Gasoline 130°F
Alcohol 140°F
Diesel 200°F
*NOTE: Flow rates approaching the maximum of either the Inlet Port or the Return Port
will reduce the vapor elimination capabilities.
Level Controller — Application Description
The Max Level Controlled recirculation tank performs two basic functions: The recirculation tank function provides
the engine with a source of fuel and allows unburned return fuel to flow back to a tank which is at atmospheric pressure. The tank is open to the atmosphere to eliminate back pressure on the engine’s fuel system as well as to vent
bubbles removed from the fuel. The tank is outfitted with a series of screens to collect the entrained vapor that
often results from the mechanical action of the injector and/or heating of the fuel. These bubbles rise to the surface,
while the engine is supplied with bubble-free fuel from the lowest port.
The level control function automatically feeds measured make-up fuel into the recirculation tank to replenish the fuel
consumed by the engine. A float activated valve is used to maintain a consistent tank level. The valve opening is
varied to regulate the flow of pressurized fuel into the tank typically through a flow meter (see page 4).
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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Model 370 Level Controller — Drawings
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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Model 370 Level Controller — Performance Curves
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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Model 372 Vapor Eliminator & Level Controller
General Description/Specications
Materials of Construction:
Body 303 Stainless
Valve Orifice 303 Stainless
Valve Seal Nitrile (Tan)
Float, Valve Stem & Screens 304 Stainless
Operational Limits:
Vapor Eliminator:
Max Float Bowl Pressure 75 psi (5 bar)
Max Air Eliminator Rate (Rate for gasoline equal to or greater than for Diesel)
Diesel @ 500 cc/min 2100 cc/min
Diesel @ 1000 cc/min 1500 cc/min
Diesel @ 2000 cc/min 300 cc/min
See Graph, page 12
Level Controller:
Max Return Rate (300 cc/min or less air) 2000 cc/min
Max Make-Up Flow Rate See Graph, page 13
Maximum Temperature of Fuel
Gasoline 130°F (55°C)
Alcohol 140°F (60°C)
Diesel 200°F (93°C)
Model 372 Vapor Eliminator & Level Controller
Application Description
The Max Model 372 may be used as either a Vapor Eliminator or Level Controller depending on how it is installed in
your fuel measurement system.
When plumbed in the Vapor Eliminator configuration, the unit removes bubbles from the fuel which would otherwise
cause measurement errors as they pass through the flow meter. Bubbles may be caused by the low boiling point components in gasoline or by hot vehicle fuel lines. A design featuring a series of screens and a float mechanism effectively
separates the vapors from the fuel.
When plumbed in the Level Controller configuration, the Model 372 serves as a vented, recirculation tank to collect
return fuel and route it back to the supply side of the engine, while maintaining its level through a float valve that controls the fuel flow through the flow meter.
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Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
Model 372 Vapor Eliminator & Level Controller -
Drawings
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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Model 372 Vapor Eliminator Mode
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Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
Flow Rate vs. Pressure for Level
Controller
0
200
400
600
800
1000
1200
1400
1600
1800
2000
1 2 3 4 5 6 7 8 9 10
Inlet Pressure (psi)
Inlet Flow (cc/min)
Model 372 Level Controller Mode
Max Machinery, Inc. 370 Series User Manual © Copyright 2016 Rev. 2
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