Haltech Flex Fuel Composition Sensor – HT-011000 Compatibility Suits 3/8" GM Spring Lock fittings. Works with any Haltech ECU that supports Flex Fuel input. Key Features Measures ethanol content and fuel temperature in real time Lets the ECU adjust the tune automatically for any ethanol/petrol blend from 0–100% Installed between the fuel pressure regulator and tank, monitoring return fuel composition What's Included Flex Fuel Composition Sensor Matching plug and 3 pins Frequently Asked Questions Q: Do I need a different tune for E85 vs pump fuel?A: No — the sensor lets a Flex Fuel-capable ECU adjust the tune on the fly for any ethanol blend, no laptop or tune swap required. Q: What fittings does this use?A: 3/8" GM Spring Lock fittings — see the matching HT-011030 fittings if you need -6AN adaptors.
