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Old 07-18-2019, 03:03 PM   #8851
TDagen
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Originally Posted by no694terry View Post
ya and it could actually go up a bit as you get closer to e85 in the tank (probably never get higher than e80 though from pump). Flex fuel tunes are a blend of two maps. at e70, the volumns only up like 85%
FWIW the good E85 pumps in MN have E85 over 80%. Xluben posted a photo of 83-84% reading on his accessport. IMO you gotta find the right stations.

https://www.instagram.com/p/BheIos-FYE-/
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Old 07-18-2019, 05:25 PM   #8852
StiLimited
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I have to drive into Vegas to get my E85 so I buy 50-100 gallons at a time and keep it in my shed. When I buy it it tests about 80-85% but after sitting in my shed for 6 months it's now 90%. So for some reason the gasoline is evaporating and the ethanol is staying behind. (best guess) I'm storing the fuel in High-density polyethylene jerry cans. (https://www.uline.com/Product/Detail...Gallon-Natural) I've tested this for 3 years now and it's always the same results. I also use the stabil for ethanol fuel stabilizer if that has any effect I don't know. Next time I'll test before and after mixing.

I like the jugs cause they can stack 3 even 4 high when full. :-)

Last edited by StiLimited; 07-18-2019 at 05:30 PM.
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Old 07-18-2019, 10:53 PM   #8853
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Originally Posted by StiLimited View Post
I have to drive into Vegas to get my E85 so I buy 50-100 gallons at a time and keep it in my shed. When I buy it it tests about 80-85% but after sitting in my shed for 6 months it's now 90%. So for some reason the gasoline is evaporating and the ethanol is staying behind. (best guess) I'm storing the fuel in High-density polyethylene jerry cans. (https://www.uline.com/Product/Detail...Gallon-Natural) I've tested this for 3 years now and it's always the same results. I also use the stabil for ethanol fuel stabilizer if that has any effect I don't know. Next time I'll test before and after mixing.

I like the jugs cause they can stack 3 even 4 high when full. :-)
This got me curious about how FlexFuel sensors actually work. This is what I found...

Typical sensors used for FlexFuel setups determine ethanol concentration by measuring the relative permittivity of what's flowing through the sensor. Gasoline has a lower relative permittivity then ethanol. Water has a higher relative permittivity then ethanol. Keep in mind ethanol is hydrophilic (water loving), so it will absorb water vapor in the air over time.

What's most likely happening in your case; the E85 is slowly absorbing water vapor in the air, which will cause a FlexFuel sensor to read higher concentrations of ethanol then actual. The Stabil may also be throwing off the readings. You could test the later by running E85 through a FlexFuel sensor without Stabil, adding some Stabil to your tank and then seeing what the sensor shows after driving around for a bit to mix it in the fuel. See the below links for more info:
https://cecas.clemson.edu/cvel/auto/...el-sensor.html

Last edited by HuckFinn; 07-18-2019 at 11:13 PM.
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Old 07-19-2019, 03:10 AM   #8854
StiLimited
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actually I'm not using a sensor. I'm using the Quick Fuel Test Tube

https://www.amazon.com/Quick-Fuel-Te.../dp/B007ZJ749O

I definitely will test next time before and after stabil.

But I doubt it's much water being absorbed. I live in a very dry area of So. Nevada, typical humidity is single digits. The fuel is kept in the HDPE containers tight, and they are in a vented shed. Not saying impossible, but if it is, I can't imagine it being much.
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Old 07-19-2019, 09:22 AM   #8855
no694terry
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Quote:
Originally Posted by StiLimited View Post
I have to drive into Vegas to get my E85 so I buy 50-100 gallons at a time and keep it in my shed. When I buy it it tests about 80-85% but after sitting in my shed for 6 months it's now 90%. So for some reason the gasoline is evaporating and the ethanol is staying behind. (best guess) I'm storing the fuel in High-density polyethylene jerry cans. (https://www.uline.com/Product/Detail...Gallon-Natural) I've tested this for 3 years now and it's always the same results. I also use the stabil for ethanol fuel stabilizer if that has any effect I don't know. Next time I'll test before and after mixing.

I like the jugs cause they can stack 3 even 4 high when full. :-)
I have a theory on this, I actually asked Bisimoto about this once on one of his life chat things and he didnt understand the question I dont think.

First to understand my theory you gotta understand that a GM ethanol sensor is actually just a ohm meter. It test the resistance of the fuel at certain temps, that is why it also has a temp gauge built into it. It knows the conductivity (ability for electricity to pass through it) for both fuels. Gasoline is pretty much di-electric, electricity can barely pass through it. Ethanol, allows a little more flow but still not enough to go shorting out your fuel pump and making you explode.

Second, you need to remember that alcohol is VERY hydroscopic, it absorbs water. WATER lets electricity flow right on through it. As ethanol sits it absorbs the water in the air and as it absorbs water, I believe that throws off the conductivity reading of the sensor.

My fuel tank is pretty vented, i have no evap or anything. I can fill up today with e75 and in a week it will be reading closer to e80 with Pittsburgh humidity
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