Low  Fuel  Warning

(Optical Sensors designed for Aircraft use )

Don't rely on mechanical sensors alone


Don't  be  FUEL-lish!

Install the "AE Fuel Guardian" in your aircraft

Optical, low fuel level sensors!


100% Solid state!

NO moving parts to rely on.



"THREE state" Annunciator Lights


(1) "Flashing" - when low fuel level occurs

(2) "Solid On" - after pilot acknowledges alarm

(3) "Alternating Flashing" - when pilot presses, "Push to Test" button


Lights can be dimmed by using  present aircraft dimmer bus


Annunciation of low fuel level is accurate!


Audio output when low fuel level  is detected


System automatically tests itself at power up


System is available for  +12Vdc or +24Vdc electrical systems


Immune to noise that occurs on aircraft DC power bus


Single button functions as "System Test and/or Alarm Acknowledge"


SAFER!  The fuel is not in contact with your electrical system like other systems!


Why do you need a low fuel annunciator?  The answer is simple.  Extra Insurance!  Your life is probably worth this small  investment.  This is a totally redundant system!  Many of the present fuel quantity indicators are inaccurate, especially when they get down to measuring the low fuel levels.  Some fuel level indicators do not have any annunciation of low fuel level.  Other fuel indicators occasionally stick.  Other mechanical systems fail. This system gets your attention before you have to switch tanks.  When the annunciator light flashes, you will know your precise fuel quantity and also the time to engine shut-down for that tank.



Two annunciator panel lights

Two optical fuel sensors

One push button

Sensor drive & annunciator electronics enclosure

Wiring - sensors to annunciator electronics enclosure

Lettering decals for many different fuel levels (black lettering)



The optical fuel sensor is a non-contact sensor mounted in a single hole in the fuel tank.  It operates by bouncing a beam of light into the sensors lens.  If it is reflected back into the sensor, there is no liquid present.  If it is not reflected back, it is dissipated into the liquid media.  The sensor output is pulled down, or activated.


The electronics constantly monitors the sensor outputs of both tanks.  When a low fuel level is detected, the appropriate light starts to blink, getting the pilot's attention immediately.  After the pilot sees the alarm, he can press the acknowledge button.  This action turns the light on solid (continuous) denoting a low fuel quantity.  This function of the annunciator eliminates the distracting flashing action of the lights for the pilot, yet he can still see that he has a low fuel indication.


The AE Fuel Guardian also has an audio output.  This can be wired into the aircraft intercom or audio system if desired.  The audio beep is only present when the annunciator lights are flashing.


The AE Fuel Guardian annunciator lights can also be wired into the aircraft dimmer bus if desired for night flight.



Can you use other fuel level sensors? 

YES, if they are compatible with our sensor output.  The output should be an "open collector" or a TTL (0 to +5V) type output.  The output must be high in air, low in fuel.  Please read below for 0 to 3.3V outputs.


Can you use a Pillar Point Fuel Sensor?

Well, maybe.  The Pillar Point sensor has an output that is an open collector output (BLU wire), but it is not compatible because it has the opposite output response.  The only output that is compatible, is the 0 to +3.3V output (WHT wire).  We have tested it and it does work.  This output is compatible with the AEFG.



HOW EASY IS IT TO INSTALL?     Click here to SEE! 



1 Year  (Parts and Labor, from date of purchase)



Here is an AE Fuel Guardian spec. sheet that you may print.

AE Fuel Guardian Summary Sheet



What fuel level should you install the sensors?

It is really up to the builder or installer.  There are several different methods and installation strategies.  Some have set the sensors in each tank to sense at different fuel levels.  One pilot used the "IFR legal limit" of 45 minutes on one tank, and 30 minutes on the other tank at the aircraft 75% power cruise speed.  I used a 1.5 gallon level on both tanks!  This was just to get my attention to change tanks before my engine quit if I forgot!  I flew a Cessna 150 for years and never had to change tanks.


How do I install the sensors at the correct level?

It's easy, click here to see!



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         Ohio Residents please add in 7.50% tax.



Model: AEFG2  (TWO SENSOR SYSTEM, 12V or 24V)  $210.00   

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Model: AEFG1, (ONE SENSOR SYSTEM, 12V or 24V)   $149.00   

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Model: Low Fuel Sensor ONLY, (LFSensor)   $49.00

(Sensor operates from +5V to +12V.)

(Aircraft bus voltage is typically higher than +12V and cannot be used to power the sensor directly.)



Here is an AE Sensor ONLY spec. sheet that you may print.

AE Fuel Sensor Spec Sheet


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12V Bulbs are included with ALL systems.

If you want to operate your system on 24V, YOU MUST purchase 24V bulbs.  See below. 



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