Consent Preferences

FR37X - Fuel Level Sensor With Integrated Feed & Return

Vertically mounted fuel level sensor with customizable options for integrated fuel feed and return pipes.

The FR37x range of Fuel Level Sensors are equipped with fuel feed and return pipes, removing the need for additional fuel extraction and filling connections and simplifying the fuel tank assembly and installation.

Fozmula’s capacitance technology means no moving parts and, as a result; improved accuracy and reliability compared to mechanical alternatives.

This range has a modular design enabling a great deal of flexibility to provide customers with options to suit specific applications. In addition to the sensor probe length, fuel system designers can specify:

  • Resistive output range
  • Level alarm height
  • 5 or 6 hole SAE mounting
  • Feed and return tube lengths and designs
  • Inlet and outlet connector types & sizes
  • Breather type
  • Suction pipe filter
  • Electrical connection type

Data Sheet
Spec Sheet


Liquids compatible with the construction materials, typically fuels, oils and water.


Length: Min.150mm, Max.1,200mm.
Mounting: 5 or 6-hole SAE.
Weight: 0.55 Kg (gauge length of 300mm).


Header: Die-cast zinc alloy.
Wetted materials: Stainless steel, polypropylene, Viton™, PTFE.
Fuel connectors: Brass.
Feed & return tubes: Aluminium.


Supply Voltage: 9-36VDC.
Supply Current: 15mA@12 VDC.
Supply Protection: Over voltage 80VDC for 2minutes.Reverse polarity.


Resistive: Any values between 0-501Ωor 501-0 Ω (3Ω Steps).
Resolution: 3Ω.
Max.dissipation: 250mW.
Alarm Output: Switch to ground.
Max 100mA.
High or low level between 7% and 90% of active gauge length.
Default setting: low level alarm at 12% of active gauge length.

Environmental Ratings

Designed to meet: Ingress:IP67.
Operating Temp: -40ºC to 85ºC.
Max tank pressure: 1bar.EMC:Type approval in accordance with EN ISO 13766:2006.
Vibration: 500mm sensor to be type tested to 1.88Grms BS EN 60068-2-4:1995.
Shock: 500m·s-2, 11 ms, BS EN 60068-2-27:1993.


Fuel inlet/outlet:

Electrical connector: The FR37x can be supplied with any suitable style of plug or receptacle.
Fuel filter: Fuel filter – 178 micron
Breather: Breather (standard shown below or specify any of the above inlet/outlet fittings) or blanking plug:

Installation drawings

Product Inquiry - FR37X