FAQ – Fuel Flow
My aircraft is 28 VDC and the transducer is 12 VDC. Is this OK?
Yes. The flow meter steps down the voltage and provides it to the transducer.
How do I change the K-factor on my flow meter?
Refer to Manual Entry Mode section of the Operating Manual. The unit must be pulled from the panel to access the switch that is used to put the flow meter into Group I configuration mode.
Do I need shielded wiring?
Yes. Shielded wiring is required. Ground the shielding on the indicator side only.
Why does the fuel flow read intermittently high?
There may be EMI noise affecting the fuel flow signal (e.g., magnetos or generator/alternator). If a Shadin Avionics (vs. Floscan) transducer is installed, a magnetic shield may be installed directly over the transducer. Contact Shadin Avionics Sales for details.
Why are the fuel flow readings erratic on a carbureted engine?
Verify that the configuration is set for carbureted not injected. Refer to the Operating Manual for details.
Can the brightness level on my Fuel Flow Management Indicator be adjusted?
Yes. The Microflo is adjustable with the toggle switch marked “Bright” on the front of the indicator. The Miniflo brightness is adjusted by turning the potentiometer located at the side/rear of the unit counter clockwise to increase the minimum intensity. The Digiflo adjustment is located on the back of the indicator though a small access hole which may be turned counterclockwise to increase the minimum intensity.
Can a standard Fuel Management System (i.e., Digiflo, Miniflo, or Microflo) be converted into one that can be interfaced with my GPS to show fuel required to destination, fuel reserve upon reaching destination, and nautical miles per unit of fuel? If so, how much will it cost?
Yes, depending on the serial number of your indicator. Contact Technical Support Department to confirm applicability.
Why are the fuel flow readings 50% of what they should be?
Verify that the K-factor is set properly and that the transducer is not installed backwards. Fuel must flow into the transducer through the side of the transducer marked “input”.
Why are the fuel flow readings inaccurate?
Verify that the K-factor is set properly and that there is not a 90° fitting within 3″ of the inlet.
Why are the fuel flow readings high?
The next time the aircraft is flown in cruise, turn on the boost pump. If the fuel flow drops, this indicates that there is air leaking into the fuel line upstream from the transducer. It is possible that air is leaking into the system through the selector valve or other connection. Consult with your avionics shop and have them contact Shadin Avionics Technical Support Department to troubleshoot.
How do I verify the software version of my fuel flow indicator?
Press the ENTER/TEST button for approximately three (3) seconds to initiate the self-test mode. The last screen displayed before returning to the fuel flow screen displays the software version.
How do I verify the K-factor currently programmed in my unit?
Press the ENTER/TEST button for approximately three (3) seconds to initiate the self-test mode. The first item displayed after “GOOD” is the K-factor expressed in thousandths (e.g., 29.6 = 29,600 pulses).