Fuel-It E85 Flex Fuel Conversion Kit for BMW S55 M3/M4 (F80 F82 F83 2014-2020) - Ethanol Content Sensor & Bluetooth Analyzer, Plug & Play -6AN/AN-6 Tank-to-Rail Line - Supports JB4 0-5V/Frequency Output, PI/HPFP Compatible - F-S55-FFK

Fuel-It Flex-Fuel Upgrade for BMW S55 F80 M3 and F82 F83 M4 - Part Number: F-S55-FFK

Unlock bio-ethanol blends on your S55-powered M car with a clean, reliable and high-flow solution. This complete conversion package replaces the factory feed with a continuous AN-6 line from tank to engine bay, integrates a fuel composition sensor and delivers live readings to your phone via Bluetooth. It is a tidy, plug-in setup that supports flex-fuel calibration on the BMW F80 saloon and F82 F83 coupe and cabriolet platforms.

At MJ Modifications we have fitted this kit on multiple S55 builds and it is a standout for neat routing, stable ethanol percentage data and excellent flow capacity for tuned cars. Customers love the ease of install, the OEM-like finish and the confidence it gives when running blends from pump petrol through to high ethanol mixes.

Key advantages

• Purpose-built for the BMW S55 3.0 twin-turbo engine in F80 M3 and F82 F83 M4
• True plug-in install with no cutting of factory hard lines
• Continuous -6AN AN-6 E-compatible hose for maximum flow from tank to bay
• Accurate fuel composition sensor for dependable blend verification
• Bluetooth fuel composition analyser for real-time data on your smartphone
• Billet aluminium adapters that connect cleanly to the OEM fittings
• Works with standard HPFP setups and port injection rails

Analyzer output options

Please confirm with your tuner which signal type you require:

• Bluetooth only
• Bluetooth with JB4 integrated 0 to 5 volt output
• Bluetooth with 50 to 150 Hz raw frequency output

Bluetooth functionality requires a compatible iOS or Android app.

Fuel line configurations

• HPFP to fuel tank - stock rail: Replaces both original feed lines with one continuous high-flow hose from the tank to the high-pressure pump and integrates the fuel composition sensor.
• Fuel-It port injection to fuel tank: Upgrades the feed from the tank to the engine bay, adds the sensor and uses a Y-adapter to supply both the HPFP and the Fuel-It PI rail. Custom fittings eliminate unnecessary tees and joins for a cleaner, higher-flow layout.
• Non-Fuel-It port injection to fuel tank: Includes a longer 18 inch feed from the Y to your PI rail. Cut to length and connect using the supplied -6AN female fitting or -6AN female elbow.

Compatibility

• BMW F80 M3 2014+
• BMW F82 M4 2014+
• BMW F83 M4 2014+

Part number

F-S55-FFK

Manufactured by

Fuel-It

Warranty

Fuel-It Limited Warranty

Fitting and support

Professional installation is recommended. MJ Modifications offers expert fitting in Warwickshire and can advise on the ideal configuration for your build. Request a quote via info@mjmodifications.co.uk.

Important notes

• For off-road use only
• Ethanol sensors infer ethanol content by measuring the absence of petrol. Contaminated fuel can cause artificially elevated readings

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