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Radiant Fuel Probe System 1/8 Inch Probes

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Part# 10-05866
MFR Model# FPS-018


The Belite liquid level / fuel probe is designed to sense fuel or liquid level of any type and provide an electrical indication to instrumentation along a range of 0 to 5 volts. The unit is not TSO’d or PMA’d. Use only in appropriate aircraft as a backup to certified instruments and pilot calculations. Ideal for monitoring level of liquid in many other applications, such as agricultural spraying.

Patent pending.


  • Stainless steel construction, 304L.
  • High precision pressure sensor, accurate +/- 2% absolute.
  • No moving parts. Based on MEMS technology.
  • Designed to be immune to temperature, shock, and vibration.
  • Will not fail if water is present in fuel (unlike capacitive probes).
  • Compatible with any tank size or depth to 48”; other options available.
  • Long term stability 0.5% per year.
  • Operating temperature range -40 to 100 degrees C (Probe Only).
  • Compatible with 9 to 14 volts input power.
  • Provides linear output of 0.0 to 5.0 volts (empty / full).
  • Built in exceptional slosh filtering and optional G filtering.
  • Includes five point calibration for empty, ¼, ½, ¾, and full tank.
  • Custom calibrations available. Contact factory.
  • Alarm output active if <25% full. Contact factory for other alarm options.


  • Provides liquid level indication between empty and full, for any tank with a minimum height of 6 inches (150mm) and a maximum height of 48 inches (1200mm); other options available.
  • The electrical output of the product varies between 0.0 volts and 5.0 volts.
  • Asserts “ALARM” when the tank is filled to less than 25% of calibrated capacity.
  • Provides active low current sink to 15 ma.
  • Includes an electrical slosh filter with an approximate time constant of 40 seconds.
  • NOTE: if a tank was quickly evacuated due to a gross rupture or failure, the system may require up to two minutes to fully reflect an “empty” condition.
  • Parts included are Liquid Probe with pigtail, Probe Computer Module & 9V connector.

Technical Design

This product incorporates the following technical elements:
  • Microprocessor with RAM & firmware
  • Input A / D converter
  • Output D / A converter
  • Slosh Filter
  • G sensor (optional)
  • Highly stable voltage supply for probe
  • Very low power consumption – approximately 10 milliamperes total consumption, with 7 milliamperes in the fuel probe


  • Fuel level
  • Liquid level in many other applications such as agricultural spraying
  • Misfueling monitor
  • Motorcycles
  • Industrial

In The Box

  • Stainless steel liquid level probe with wiring harness for attachment to Probe Computer Module.
  • Probe Computer Module with five point calibration.
  • Power pigtail to Module, with 9V connector for testing.


Perfect product for my odd sized marine diesel tank. The 4 level calibration box is quite accurate. Used it with a VDO 0-5 volt (CANBUS) 270 degree sweep fuel gauge w/warning light built-in.

Mark P
February 8, 2021

Seems to be working as expected so far. Have fuel probe installed in piping underneath the tank. Recommend this product if you dont want to make hole in your fuel tank.

Harry A Verified Purchase


June 7, 2023

Item came well packaged with nice complete wiring, etc. I’m using with a $45 2” round 0-5v gauge because Belize’s $250 instrument didn’t seem reasonable. It works perfectly but took some effort to figure out as the wire colors in the instructions did not match. Nor did it give hookup for using gauge other than theirs.

April 26, 2020

Mixed review. I attempted to use them on a Lancair 360 wing tanks. Although it might give you an indication while static on the ground, the vent pressure at speed changes the head pressure too much so they are inaccurate in flight. The manual suggests they are not for fast airplanes. I only used the 5v transducer itself and fed the signal to my G3X.

Laminar C Verified Purchase


June 15, 2022


Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Can this probe be installed on bottom of fuel tank?

Yes, the probe can be installed on the bottom of the tank.

Q: Can this probe system be used with other capacitive Fuel gauges like UMA?

It most likely can, but we recommend using like kind probes.

Q: What is the size of the fitting that goes in the tank?

1/8 NPT.

Q: Can this unit be installed in the end of a fuel tank?

Yes, that is common. But consider the depth of the tank, which we recommend as 12 or more. Also, tanks which are pressurized will not work.

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