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F1’s Ex-Fuel Flow Meter Supplier Files Lawsuit Against Replacement Before US GP
Highlights
- Sentronics sued Allengra over fuel flow meter patent infringement.
- Lawsuit filed October 16, 2026, in Texas federal court.
- Allengra replaced Sentronics as F1 fuel meter supplier from 2026.
- Patent covers ultrasonic fuel flow measurement granted July 2022.
- Sentronics seeks injunction and triple damages for lost profits.
- US Grand Prix will proceed unaffected despite ongoing lawsuit.
Sentronics has sued Allengra in the Western District of Texas, alleging patent infringement on F1 fuel flow meters, with the case filed October 16, days before the Austin Grand Prix.
The German firm Allengra replaced Sentronics as FIA supplier for 2026–2030. Sentronics previously held the exclusive contract from 2018 to 2025.
The dispute focuses on US patent 11,391,609, granted in July 2022, covering an ultrasonic flow meter architecture for accurately measuring a vehicle’s fuel flow rate.
Fuel flow meters underpin FIA policing of maximum flow limits, shaping combustion engine output and strategy, as reflected in Horner’s recent comments on engine performance.
Sentronics’ patent describes transmitting paired ultrasonic signals in opposite directions through fuel. By comparing travel time and phase differences, the sensor derives instantaneous flow with high precision.
US patent 11,391,609, granted in July 2022, sits at the center of Sentronics’ claim.
Sentronics says it evaluated Allengra’s meters in late 2024 and found infringement. It also shared confidential technical information with the FIA under a non-disclosure agreement.
The complaint alleges direct infringement and inducement through deployment across the United States, including the Austin, Miami, and Las Vegas Grands Prix.
Sentronics is asking for a permanent US injunction halting Allengra’s manufacture, sales, and supply.
Sentronics says Allengra knew of a related European patent by August 2025 and ignored an April 2026 demand letter, constituting willful infringement.
The FIA acknowledged Sentronics’ notice in September 2025. With the dispute unresolved, Sentronics asks the court for a permanent US injunction against manufacture, sales, and supply.
Damages sought include lost profits and unpaid royalties dating to 2022. Sentronics also requests treble damages, arguing Allengra’s conduct is deliberate.
Despite the lawsuit, no emergency injunction is sought, so the Austin race weekend continues unaffected.
There is no emergency injunction, so the Austin race weekend proceeds as scheduled, alongside our United States Grand Prix guide. The court is expected to issue a summons next.
Any injunction or damages award could reshape the fuel-meter supply chain and compliance practices. Teams would need clarity quickly to safeguard engine calibration and legality for future events.
The dispute sits within a broader legal backdrop, following matters like the Williams Racing lawsuit, underlining how off-track battles can shape competitive frameworks.
Visual Summary
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Sentronics
(Patent Owner)
⛽
Allengra
(Current Supplier)
LAWSUIT
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⚠
⏳
Court Case Filed Days Before US Grand Prix
October 16, Western District of Texas
💧
Every F1 Car Could be Affected
Fuel flow meters in spotlight
🧑⚖️
Patent Power Play
Sentronics wants triple damages & ban on meters
2018–2025
Sentronics
Supplied F1
Supplied F1
2026–2030
Allengra
Replaces Sentronics
Replaces Sentronics
Sensor Tech Showdown:
Who Controls F1’s Fuel?
Who Controls F1’s Fuel?
As the race weekend approaches, the real battle may be out of sight—inside every car’s fuel line, in the courtroom, and for the future of F1’s most secretive tech.
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Daniel Miller reports on Formula 1 Grand Prix weekends with race-day analysis, team-radio highlights, and point-standings updates. He explains power-unit upgrades, aerodynamic developments, and driver rivalries in straightforward, SEO-friendly language for a global F1 audience.
