Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

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

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
Reply With Quote
Old 12-18-2011, 03:42 PM
Rupester Rupester is offline
Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195

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.
Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
Reply With Quote
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.
Robert Williams
Lee's Summit, MO
RV-8 - Empennage & Wings Done
Working on Fuse

1946 Cessna 120
Reply With Quote
Old 12-18-2011, 07:34 PM
Strasnuts Strasnuts is offline
Join Date: Jan 2009
Location: Salt Lake City, Utah
Posts: 557

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.
A&P RV-10 Flying 1000+ hours
SuperSTOL Flying 170 hours
Reply With Quote
Old 12-18-2011, 09:36 PM
David Z David Z is offline
Join Date: Aug 2010
Location: Thunder Bay Ontario
Posts: 820

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.
Empennage Passed Pre-close Inspection
Wings mostly done
Fuselage deburring and dimpling. So many holes
Dash 8 day job is financing the RV8
Donation till September 2022

Last edited by David Z : 12-18-2011 at 09:37 PM. Reason: phrasing
Reply With Quote
Old 12-18-2011, 09:43 PM
flyboy1963's Avatar
flyboy1963 flyboy1963 is offline
Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,434
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 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 50 and and 1/8th?
Perry Y.
RV-9a - SOLD!....
Lake Country, BC
Reply With Quote
Old 12-18-2011, 09:54 PM
Join Date: Mar 2008
Location: Seattle
Posts: 1,412

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.
Scott Emery
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
Reply With Quote
Old 12-18-2011, 10:21 PM
N941WR's Avatar
N941WR N941WR is offline
Join Date: Jan 2005
Location: SC
Posts: 12,887

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.
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
Reply With Quote
Old 12-18-2011, 10:56 PM
yakdriver yakdriver is offline
Join Date: Aug 2006
Location: Twin Falls, ID
Posts: 683

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
RV 7 N212MD Flying as of 12/22/2007
Backcountry/TCOW Super Cub flying 03/12/2011
Next project?
Reply With Quote
Old 12-19-2011, 03:21 AM
RV6_flyer's Avatar
RV6_flyer RV6_flyer is offline
Join Date: Jan 2005
Location: NC25
Posts: 3,792

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

It says 1-year.

Article was written by a Shell Engineer.
Gary A. Sobek
NC25 RV-6
3,500+ hours
Where is N157GS
Building RV-8 S/N: 80012

To most people, the sky is the limit.
To those who love aviation, the sky is home.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 07:44 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.