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Discussion Starter #1 (Edited)
This will seem basic to many of us, but I thought it was great information to post here for what it is worth. Dave Buschur did some testing on flex fuel sensors and found out that in general, they measure gasoline content, not ethanol content. The display essentially subtracts gasoline content from 100% to give you a perceived ethanol content, but if you have water in the gas, your 85% content may be false.



If any of this is counter intuitive, interested in hearing your comments...
 

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Not only will water give you a false reading, but anything that has the same capacitance as the fuel/ethanol mix. Its basically a long capacitor.
 

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That's very interesting. I wonder if all the sensors on the market are on the same? I've been having exactly the opposite results. Using the distilled water test right out of the pump I'm get 10% higher readings than my sensor in the car. If what he's saying about analyzing only gasoline, either that would be impossible, or I have a fault sensor.
 
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