The Continental flex fuel sensor measures the ethanol-gasoline ratio of the fuel being used in a flexible fuel vehicle. Flexible fuel vehicles can be operated with a blend of ethanol and gasoline, up to 85 percent ethanol. In order to adjust the 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, an incoming fuel connection, and an outgoing fuel connection. All fuel passes through the flex fuel sensor before continuing on to the fuel rail. The flex fuel sensor measures the fuel alcohol content, and sends an electrical signal to the engine control module (ECM) to indicate ethanol percentage.

The flex fuel sensor has a three-wire electrical harness connector. The three wires provide a ground circuit, a power source, and a signal output to the ECM. The power source is battery positive voltage and the ground circuit connects to an engine ground. The signal circuit carries the ethanol percentage via a frequency signal to the ECU.

The fuel composition sensor uses a microprocessor inside the sensor to measure the ethanol percentage and changes the output signal accordingly. The signal circuit carries the ethanol percentage via the frequency signal. The ECM provides an internal pull up to 5V on the signal circuit, and the fuel composition sensor pulls the 5V to ground in pulses. The normal range of operating frequency is between 50-150Hz. The microprocessor inside the sensor is capable of a certain amount of self-diagnosis. An output frequency between 180Hz and 190Hz indicates that the fuel is contaminated.

Specs:
Inlet Size: 3/8" Quick-connect
Outlet Size: 3/8" Quick-connect

Wiring:
Pin 1 - Battery Positive Voltage
Pin 2 - Ground
Pin 3 - Fuel Composition Sensor Signal Out

Options:
-Optional Connector Pigtail plugs into sensor.
-Optional Expansion Flex Pigtail plugs into ECU's expansion port and includes 8 ft ground, and signal wires. 
-Trim wires to preferred length and connect the two pigtails together and add key on 12v for a complete plug and play wiring solution. If you're purchasing coil on plug kit or expansion flying lead harness, you just need the wiring pigtail option and not the expansion flex pigtail option.

Perfect for use with PiMPx, PiMPxs, PiMPshift, original PiMP, Microsquirt, Megasquirt, or other flex fuel capable ECU's.