GM Flex Fuel Sensor with Pigtail
GM Flex Fuel Sensor with Pigtail

This GM flex fuel sensor measures the ethanol-gasoline ratio of the fuel being used. In order to adjust ignition timing and the fuel quantity to be injected, the engine management system requires information about the percentage of ethanol in the fuel.

The flex fuel sensor uses quick-connect style fuel connections for both incoming fuel and an outgoing fuel connections. All fuel passes through the sensor before continuing on to the fuel rails. The flex fuel sensor measures the fuel / alcohol content, and sends an electrical signal to the engine control module (ECM) to indicate ethanol percentage.

Female mating connector / pigtail.

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⚠ WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.  For more information go to

All parts & products are sold for off-road use only. By purchasing this product you acknowledging this as fact, and maintain all responsibility in its use otherwise. 

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