The Matronics FuelChec (tm)
Return Flow Controller

The FuelChec (tm) Return Flow Controller

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  • Description

    • The RFC is used in applications where some portion of the fuel flowing through the line is returned directly back to the fuel tank. This requirement is most often found in fuel injected engine installations where the fuel pressure is kept relatively high and fuel is recirculated back to the fuel tank for cooling purposes.

  • Theory of Operation

    • The FuelChec (tm) Return Flow Controller (RFC) counts pulses generated by the Forward and Reverse fuel flow transducers. Pulses received from the Forward transducer are considered “positive” and pulses received from the Reverse transducer are considered “negative”. The RFC generates output pulses that are equal to the sum of the received positive and negative transducers pulses (Forward + (-Reverse)). The rate of the RFC's output pulse stream is evaluated 10 times per second.

  • Return Flow Controller LED Indicators

    • There are 4 green LED indicators on the top righthand side of the RFC. These LEDs indicate the current status of the RFC. Each of the LED functions is described below:

  • Forward Flow

    When illuminated, this LED indicates that the RFC is receiving pulses from the Forward Flow transducer. When the RFC stops receiving pulses from the Forward Flow transducer, the LED will go off in about 3 seconds. Note that this LED does not flash with each pulse that is received; it is simply turned on when pulses are detected and off when they are not.

  • Reverse Flow

    When illuminated, this LED indicates that the RFC is receiving pulses from the Reverse Flow transducer. This LED performs in the same manner as the Forward Flow indicator.

  • FuelChec (tm) Signal

    When illuminated, this LED indicates that the current forward flow is greater than the reverse flow, and that output pulses are being generated that are equal to the difference between the forward and reverse flows. Again, this LED does not flash with each pulse generated; it is simply turned on when pulses are being generated and off when they are not.

  • Controller Status

    This LED will flash slowly about every 2 seconds indicating that the RFC is operational and that it is functioning correctly. When this LED is either off or on continuously, a problem with the RFC is indicated. Powercycling the RFC will usually reset the unit.


  • Specifications and Limitations

  • Dimensions
    Height: 2.375"
    Width: 5.875" ( Excluding external DB9 Connector )
    Thickness: .9375"
    Weight: 4.5 Ounces
  • Power Requirements
    Voltage: 12 Volts DC Regulated ( Supplied by FuelChec (tm) )
    Current: ~50ma at 12 Volts DC
  • Performance
    Forward Flow Input Maximum: 5000 Hz ( 600 GPH Typical )
    Reverse Flow Input Maximum: 5000 Hz ( 600 GPH Typical )
    Forward - Reverse Differential Maximum: 415 Hz ( 50 GPH Typical )
    Forward - Reverse Differential Minimum: 2 Hz ( .2 GPH Typical )
    Typical Differential Flow Range: .2 GPH to 50 GPH ( 2 to 415 Hz )
  • Accuracy
    Fuel Flow Output: +- 1 Hz ( +- .12 GPH Typical )

  • The RFC Controller Kit

    • The RFC Controller Kit includes the preassembled and tested Return Flow Controller, Reverse flow Floscan 201b transducer, complete wiring and connector kit, and a detailed installation and configuration guide.

  • FuelChec (tm) Pricing (Febuary 2015)

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  • View or Print the FuelChec (tm) Return Flow Controller Brochure with Adobe Acrobat

    • Available From


    PO Box 347
    Livermore, CA 94551-0347
    Sales and Support - 925-606-1001
    FAX - 925-606-6281
    Internet Email - sales@matronics.com
    WWW Server - www.matronics.com

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