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  #1  
Old 12-18-2011, 03:32 PM
Lan Vinh Do's Avatar
Lan Vinh Do Lan Vinh Do is offline
 
Join Date: Nov 2007
Location: moncton NB
Posts: 238
Default 100ll shelf life

Hi
I try to start a flight club in my area and maby buy a fuel tank.
The company that would see me the 100ll say that it have a shelf life of 3 month and the minimum to be old is 5000 gal at a time. When i read on he internet, a lot of place say that the shelf life is 1 year. It would be a co-op non profit and there would be a big difference if we have to use 5000 gal a year vs 20 000 gal. Year
Anybody have more info??

Thank you

Lan vinh Do
Rv10 c-gmce
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  #2  
Old 12-18-2011, 03:42 PM
Rupester Rupester is offline
 
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Location: Mahomet, Illinois
Posts: 2,195
Default

A few months back I saw an excellent webinar by Swift Fuels (of West Lafayette, IN) that showed photos of the degradation of 100LL with time. The amount of precipitate-like material in 100LL after a month or so was shocking. From what I saw, I would say the 3 month estimate is much closer to accurate than the 1 yr estimate.
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  #3  
Old 12-18-2011, 06:32 PM
DaAV8R DaAV8R is offline
 
Join Date: Jul 2009
Location: Lee's Summit, MO
Posts: 749
Default How long?

I've seen several planes flown on 100LL that was a year or two old with no issues. I've been under the impression that 100LL didn't spoil. Auto gas is another story. I think I'll put some 100LL in a jar and let it sit. If it goes bad in a month I will be shocked.
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  #4  
Old 12-18-2011, 07:34 PM
Strasnuts Strasnuts is offline
 
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Location: Salt Lake City, Utah
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Default

I've always heard a year with the additives they put in 100LL. Mercruiser maintenance school taught auto-gas has 21 day shelf life hence the need for stabilizer.
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  #5  
Old 12-18-2011, 09:36 PM
David Z David Z is offline
 
Join Date: Aug 2010
Location: Thunder Bay Ontario
Posts: 776
Default

I've seen cars sit for 8 months with auto-gas in the tank. No stabilizer or anything. They started and ran terrible for 10 minutes or so until the gum got flushed out of the system.

If I remember properly, the expirey date stamped on sealed Avgas fuel drums is 2 years.
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Last edited by David Z : 12-18-2011 at 09:37 PM. Reason: phrasing
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  #6  
Old 12-18-2011, 09:43 PM
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flyboy1963 flyboy1963 is offline
 
Join Date: Oct 2008
Location: Lake Country, B.C. Canada
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Default me too!

Lan vinh,
our local club is also in a similar boat, and wondering if all the hassle is worth getting a tank, probably additional liability insurance, or starting up an LLC separate from the club to cover the fuel 'business' while remaining, as you say, a non-profit or co-op style operation.
Would appreciate if you stay in touch by PM or whatever.....how you will sell it, by card-lock etc., and if you will sell to transient aircraft ( which would increase your use, likely getting you to the magic 20,000 litre mark if desired).
Heck, we're not even sure if anyone local will sell to us, or deliver it?
I read somewhere that shell, Imperial, and Petro-can are the only avgas refiners in Canada, but maybe you have some options out there on the east coast.
good luck!
P.S. are Ace McCool and DEI still flying out of Moncton....at 50 and and 1/8th?
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  #7  
Old 12-18-2011, 09:54 PM
SHIPCHIEF SHIPCHIEF is offline
 
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Location: Seattle
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Default

Last year my son bought a 1966 Bellanca Cruisemaster that had sat in a hangar for 15 years. One tank had dripped out onto the floor and was empty.
the other two tanks were full of 100LL, which was clean blue and smelled perfect.
We dutifully drained it and put in new fuel for the first flight to go with the rebuilt engine, but that old fuel still was clean, without any sediment or other visible defect, and it sure did explode when we used it on a brushpile.
!!
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  #8  
Old 12-18-2011, 10:21 PM
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N941WR N941WR is offline
 
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Default

Some years back AOPA (or was it the EAA) had an article on the differences between auto fuel and 100LL.

One of the things they mentioned in there was that auto fuel was good for one year and 100LL was good for two.

Take this all with a grain of salt (OK, maybe a salt lick) because try as I might, I have been unable to locate this article on the net.

Maybe someone else remembers that article. BTW, that could got back more than 20 years.
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  #9  
Old 12-18-2011, 10:56 PM
yakdriver yakdriver is offline
 
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Location: Twin Falls, ID
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Default

Just flew a C 140 today that had not flown for 11/2 yrs. Checked the fuel and it was nice clear/blue and smelled good. Flew it with no issues. Don
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  #10  
Old 12-19-2011, 03:21 AM
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RV6_flyer RV6_flyer is offline
 
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Location: NC25
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Default

I thought it was two years but found out I was wrong when I looked up the reference.

It says 1-year.

http://www.eaa.org/autofuel/autogas/...f%20avgas_.pdf

Article was written by a Shell Engineer.
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