[f-AA] Auto-gas STC

[Ronald Griffith, Jr.]

Yes, the STC requires the fuel to be free of alcohol.  You can get all 
the tech data on the STC and how to test for alcohol from the EAA 
website.  I also recommend ordering a vapor-pressure guage from 
Petersen.  If you check for alcohol and check the vapor pressure before 
you fly, autogas works well.  I don't recommend it if your airplane sits 
for long periods of time between flights.  I don't like to keep autogas 
longer than 3 months but that is a personal preference.  We used it 
successfully in our 172.  However, it has become too much trouble to 
test gas from 5 different stations to find one without alcohol.  I've 
gone back to 100LL due to this problem.  We asked each station if they 
had alcohol.  All said NO.  4 out of 5 samples showed alcohol when we 
tested.  I don't guess we should expect the person at the register to 
know much about fuel composition anyway.  Ron

Dwayne.Lafave at k12.sd.us wrote:

>How common is the use of auto gas in a 7AC?
>Any pitfalls one needs to be aware or if using auto gas?
>I know not to use ethanol, but have heard some concerns about lesser
>amounts of alcohol being added to gas without having to be labeled.
>Would there b potential problems with that?
>
>
>Dwayne J. LaFave
>
>605-854-3151 (H)
>605-860-1650 (C)
>
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