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Jerry Cochran
Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR
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 Posted: Sun Feb 17, 2008 12:12 pm Post subject: Ethanol: Was Alcohol proof fuel tank sealer? |
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I think we all need to be aware that ethanol in our fuel poses risks other than sealer for tanks. For one thing it absorbs water so if you store with less than full tanks, you will gain some H2O in them and never now it with a sump test. Far as that goes, if it rains on your bird you will have no way to know if water in tanks because the ethanol will hide it. Another thing is it likes to eat rubber and some synthetics. My engine supplier, Superior, specifically rules out any ethanol use. I was happy using 92 oct mogas here in OR which I tested ethanol free, but now our legislature has stupidly mandated 10% ethanol year round in the the entire state. So it's 100LL for me, I just don't feel like messing with ethanol...
My dime,
Jerry
| Quote: | | Quote: |
From: JFLEISC(at)aol.com (JFLEISC(at)aol.com)
Subject: Alcohol proof fuel tank sealer?
My RV-4 fuel tanks are 18 years old and starting to leak (I'm the second
owner and one was seeping when I first got it 12 years ago). Its time to take
them off and reseal them. Has anyone had any luck with any sealer that will
stand up to the alcohol in auto gas? What does that RV-3 team that runs on
methanol use? Thanks.
Jim |
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More new features than ever. Check out the new AOL Mail!
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JFLEISC(at)aol.com
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| Posted: Sun Feb 17, 2008 1:12 pm Post subject: Ethanol: Was Alcohol proof fuel tank sealer? |
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In a message dated 2/17/2008 3:14:29 P.M. Eastern Standard Time, jerry2dt(at)aol.com writes:
| Quote: | I think we all need to be aware that ethanol in our fuel poses risks other than sealer for tanks. For one thing it absorbs water so if you store with less than full tanks, you will gain some H2O in them and never now it with a sump test. Far as that goes, if it rains on your bird you will have no way to know if water in tanks because the ethanol will hide it. Another thing is it likes to eat rubber and some synthetics. My engine supplier, Superior, specifically rules out any ethanol use. I was happy using 92 oct mogas here in OR which I tested ethanol free, but now our legislature has stupidly mandated 10% ethanol year round in the the entire state. So it's 100LL for me, I just don't feel like messing with ethanol...
My dime,
Jerry
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I'm afraid I don't understand the water thing. My wife's plane got a load of water in one of the tanks when I didn't get the cap on right. When we came to fly it next weekend I had to drain several cup fulls of water out of the sump 'till it ran clear just like any other preflight. The water was obvious to me, no mystery. My RV-4 and particularly hers (with a Cont 0-300D which was designed to run on 80 octane) seem to run much better on no-lead. I haven't had any exhaust valve issues since switching to no lead about half dozen years ago. Had the engine apart recently on my 0-360 (due to a prop strike) and it was particularly clean inside. I too had worries about the carburetor but after examining every part could find no anomalies. My engine builder (that would be me) hasn't ruled out any "experimenting".
The 'O' rings on the fuel tank caps did swell however. For twice the price of a set of 2 Van's replacement rings I bought a bag of 100 (smallest order I could get) Buna-n rings figuring I could replace them every few months for the rest of my life. Problem is, they won't swell. Still on the original 2 after 4 years. I have been careful to keep an eye on things but haven't had any issues other than the tanks. That's why I wanted to get some input from anyone who has also withstood the test of time.
Jim
Delicious ideas to please the pickiest eaters. Watch the video on AOL Living.
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