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  #1   IP: 24.91.90.40
Old 03-15-2011, 06:36 PM
rshearley rshearley is offline
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Ethanol Free alternatives? 100LL/Avgas?

There has been some discussion on our Tartan 27 group about switching to 100LL/Avgas, especially now with the proposal of an E-15 Mogas formulation.
I seem to remember that there used to be a formulation of Avgas without TEL.
Does anyone run 100LL or the TEL free equivalent and if so have you found any problems, IE plug fouling or cooler running temp. Did you switch plugs or change thermostats or is the temp reduction created by running higher octane insignificant? Does 100LL cause rough idling and would the carb. need re-jetting or adjusting?
I ran regular gas last season with MMO and ethanol treatment and the engine did run okay but I noticed at the end of the season that the rubber gasket on the sediment bowl had swollen to the point I could not re-use it. I drained the racor filter as well as replacing the element several times during the season and each time found both evidence of moisture as well as a fair amount of crud. I also have an in-line filter after the fuel pump and that seemed to have some kind of sludge build up in it... I also found evidence of build up in the sediment bowl during mid-season inspection. I really feel that using E-10 and especially higher blends in marine fuel is not appropriate...
Thanks for all the great insight!
Rich Shearley

Last edited by rshearley; 03-15-2011 at 07:06 PM.
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  #2   IP: 173.20.99.40
Old 03-15-2011, 06:54 PM
sailhog sailhog is offline
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My understanding of 100LL is that the higher octane makes it late to spark. I'd guess that a lower octane, ethanol free gas would be better -- and less expensive. Our marina sells it for $3.80/gal. Av gas is probably a good bit more expensive.
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  #3   IP: 68.173.38.216
Old 03-15-2011, 07:54 PM
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CalebD CalebD is offline
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Ethanol

I came across this company Valvtect somewhere: http://www.valvtect.com/marineFuelGasoline.asp
After reading the text on this page I could not find anywhere that stated their gasoline was 'ethanol free' but rather 'specially formulated'. The picture of the gasoline showing phase separation sure looks like the gas I drained out of my tank a few weeks ago.
Does anyone know anything about this company's products? It sounds too good to be true (and probably is) but is supposedly available at a marina near me.
Sailhog,
Would you care to share which marina you use that sells ethanol free regular gas?
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Old 03-15-2011, 08:07 PM
sailhog sailhog is offline
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Caleb,
It's Marina Village Marina in Freeport, Florida. The ethanol-free fuel sales are advertised here:

http://www.marinavillage.info/marina...YachtClub.aspx

It's my understanding that all U.S. marina fuel depots can sell ethanol-free gasoline.
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  #5   IP: 199.173.224.31
Old 03-23-2011, 11:43 AM
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I filled my tank with avgas for the fall. It sits for the winter MUCH better than car gas. I got the impression it was a little harder to start in cold weather. Avgas has a lower vapor pressure than car gas, which could be the reason.
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Old 03-23-2011, 03:46 PM
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domenic domenic is offline
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I don't know about other states, but here in Calif, airports can't sell to anyone who don't have an aircraft.
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