Fuel Level Monitoring
Overview
Know exactly how much fuel is in every tank, every second of the day. A precision fuel-level sensor sits inside the tank and reports the real level to your GPS tracker with around 1% measurement accuracy and millimetre-level sensitivity to change — independent of the OEM dashboard gauge, which typically reads in quarter-tank steps and cannot tell a refuel from a drain. From that one signal the platform separates three things the dashboard cannot: a legitimate refueling event (a controlled rise at a known time and place), a drainage or siphon (a sharp fall outside the expected pattern), and continuous consumption during operation. Each event is timestamped against location and driver, so fuel data lines up with where the vehicle was and who was responsible. Operators running this approach worldwide typically report meaningful fuel-cost reductions — documented cases include 150 trucks in Mexico (25% fuel-expense decrease) and stationary site tanks up to 300,000 litres where theft was eliminated entirely.
Challenges
- Dashboard gauges are imprecise. A 200-litre swing can read as "half full" on a typical sender resistor, so spot checks miss everything between the marks.
- Refueling and drainage both reduce tank level. Without timestamped events and location, gauge readings alone cannot tell a legitimate fill from theft.
- Mixed fleets carry different tank shapes. Volume readings must be calibrated per vehicle — a generic "litres remaining" figure is worse than no number at all in a finance report.
- Tank sender wiring is fragile and OEM-specific. Wireless / BLE-based sensors deploy on trailer swaps, daily rentals, and unusual tank geometries without running new cabling.
- Stationary fuel storage at depots and remote sites has no gauge at all. A 300,000-litre site tank is typically dipsticked by hand once a day — the gap most fuel theft operates inside.
Benefits
- You see the real number, not the gauge's guess. Litre-accurate readings calibrated per tank shape, accurate to about 1%.
- Every refuel reconciles against your fuel card. Time + location + tank-level rise turn a monthly statement into a verifiable event log; depot pump versus roadside fill is unambiguous.
- Drainage and siphon attempts trigger alerts in seconds. The GPS tracker pins the event to vehicle, route, and driver — so finance attributes loss to an event, not a person.
- Trailers, rentals, and oddly-shaped tanks are covered. BLE sensors run on internal battery for around five years and pair to the in-cab tracker over Bluetooth — no wiring back to the cab.
- The same sensor family scales from a 60-litre van to a 300,000-litre site tank. One product line covers vehicles, trailers, stationary storage, and generators — no separate stack per asset class.
Recommended Products
Dominator
Modular capacitive fuel level sensor with adjustable length for reuse across vehicles. Available in RS232, RS485, CAN, and analog/frequency interface variants. Stores internal fuel capacity calibration tables and provides fuel theft detection with alarm output.
- Modular design with adjustable length for reuse across different tanks
- Standard element extension capability for various tank depths
- Simple disassembly for verification without removing tank fixtures
Eurosens
Dominator BT
Wireless capacitive fuel level sensor with Bluetooth BLE interface powered by built-in battery. Requires no cable connection during installation and offers 5-year battery life. Compatible with BLE-enabled monitoring terminals from Teltonika, Queclink, Neomatica, and Navtelecom.
- No cable connection required during installation
- 5-year battery operation from built-in power source
- Smartphone configuration via mobile app
Eurosens
Dizzi
Ultrasonic liquid level sensor that measures through the tank bottom without drilling or tank modification. Uses echolocation principle for non-contact measurement. Safe for explosive, sterile, aggressive, and pressurized liquids including liquefied gas.
- Measures through tank bottom without drilling or modification
- Safe for explosive, sterile, aggressive, and pressurized liquids
- No tank construction modification needed
Eurosens
LPS
Fuel presence detection sensor for tanker truck discharge lines. Installed downstream of the discharge valve as a spacer between the API flange and valve. Transmits binary fuel status (present/absent) via RS485 interface using LLS protocol.
- Binary fuel presence detection (Yes/No) in discharge lines
- Mounts as spacer between API flange and discharge valve
- Independent sensors per discharge line
Eurosens
DUT-E
Capacitive fuel level sensor for measuring the level of diesel fuel and other nonconductive liquids in vehicle and stationary tanks. Available in RS-232, RS-485, CAN 2.0B (SAE J1939), analog/frequency and 4-20 mA current output variants. Conversion reduced error is within ±1.0% of the measuring part length over a -40 to +85 °C range.
- Measures level of diesel fuel and other nonconductive liquids in vehicle and stationary tanks
- Conversion reduced error within ±1.0% of measuring part length
- Wide supply voltage range 10-45 V with pulse interference protection ≥100 V
Technoton
DUT-E 2Bio
Capacitive fuel level sensor with an additional function for automatic correction of readings for various types of diesel fuel. Available in RS-232, RS-485, CAN 2.0B (SAE J1939), analog/frequency and 4-20 mA current output variants. Conversion reduced error is within ±1.0% of the measuring part length over a -40 to +85 °C range. ECE R10 type approved.
- Measures fuel and nonconductive liquid level in vehicle and stationary tanks
- Automatic correction of readings for various types of diesel fuel
- Conversion reduced error within ±1.0% of measuring part length
Technoton
DUT-E S7
Wireless capacitive fuel level sensor that transmits data over Bluetooth 4.1 using the Technoton S7 bus wireless network protocol. Battery-powered with at least 5 years battery life, conversion reduced error within ±1.0% of the measuring part length, and an explosion-protection marking 0Ex ia IIA T4 X.
- Wireless fuel level measurement via Bluetooth 4.1 (S7 bus)
- Conversion reduced error within ±1.0% of measuring part length
- Battery life not less than 5 years (no wiring required)
Technoton
FMC650
FMC650 is a direct successor to 4G PROFESSIONAL device FMC640. FMC650 has 4G LTE Cat 1 network coverage including 2G (GSM) fallback compatibility
- SCALABLE PROJECTS WITH EXTERNAL DEVICES — Integrate external sensors, RFID readers, thermographs, and other devices at any stage of the project to provide full context on cargo, driver, and fuel status
- FULL VISIBILITY INTO MACHINERY OPERATIONS — Collect CAN data to monitor key parameters specific to agricultural, marine, and heavy machinery, making all component use traceable and measurable
- SMART TACHOGRAPH DATA MANAGEMENT — Download tachograph files remotely and manage driver activity with real-time counter data via K-line, Tacho CAN, or FMS
Teltonika Telematics
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