Zeitronix - ECA1

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 Zeitronix Ethanol Content Analyzer


Real time display of fuel ethanol content from 0% to 100%
Displays fuel temperature in Fahrenheit and Celsius ranging from -40 to 125 °F (-40 to 52 °C)
Error indication in event of signal absence from Flex Fuel Sensor
Two analog outputs: Ethanol % and Fuel Temperature for use with datalogging or engine management systems
Surface mountable sleek aluminum enclosure with bright LED display visible even in direct sunlight
A flex fuel sensor is required.  The ECA is compatible with standard OEM sensors used in most vehicles with the flex fuel insignia or which run on E85
Dimensions: 2.8 x 1.8 x 0.75 inches (71 x 46 x 19 mm)
Made in the USA!


We offer new Flow Through Flex Fuel Sensor as a part of ECA Kit, which includes the Ethanol Content Analyzer, Flow Through Flex Fuel Sensor and ECA Harness with a correct connector. ECA Kit can be purchased directly from our order page.
Note than connectors for Flow Through Flex Fuel Sensor and 12570260 Flex Fuel Sensor are different. We offer both styles.
What's your ethanol percentage?
The ethanol content of E85 fuel can vary from 60% to 92% ethanol. A fill up with E85 can drastically change the mix of fuel in your vehicle.  For performance drivers determining actual ethanol content of E85 is essential to maximizing an engine tune and horsepower.
Why know your ethanol percentage?
E85 has the equivalent octane rating of 105 octane gasoline.  Higher octane fuel is more resistant to knock allowing for more aggressive ignition timing, higher compression and increased engine power over gasoline itself.  The Zeitronix Ethanol Content Analyzer helps you get the most out of your engine and fuel.
Which vehicles have the flex fuel sensors?
A partial listing of vehicles with flex fuel sensors is listed below.  Newer vehicles with the capability for using E85 also use flex fuel sensors.  Check for sensors with the following part numbers: 12568450 or 12570260.  A picture of the sensor is given to the right and dimensions of the sensor are also given below.
What are the sizes of the flex fuel sensor inflow and outflow lines?
Zeitronix Flow Through Flex Fuel Sensor both tubes are 0.37" and 0.5" at the flange.
12570260 flex fuel sensor tube sizes are as follows:
     Larger (outflow) tube:   0.37" and 0.5" at the flange.
     Smaller (inflow) tube:   0.31" and 0.44" at the flange.
The usual mounting location for the sensor is the return fuel line.
Always check for fuel leaks.

ECA Analog Outputs
Ethanol content and temperature analog outputs are available as part of the ECA.  The flex fuel sensor does not provide these outputs.  We have created the ECA to provide these outputs making use of E-85 easier with after market engine control modules and data logging systems.
Analog Outputs 
Ethanol Percentage
0-5 Volts
0% to 100%
Fuel Temperature
0-5 Volts
-40 to 125 °C (-40 to 257 °F)