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02-24-2010, 11:02 AM
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Join Date: Jan 2006
Posts: 934
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Old 100LL Fuel Question
For those well-versed in fuels, I drained about 10 gallons of year old 18 month old 100LL from my other homebuilt (yea, I've been flying the snot out of the RV), and re-filled with newer fuel (ground runs haven't eaten up the fuel). I'm now trying to figure out what to do with the old fuel, can I add a couple gallons at a time to the new fuel to mix it up and consume it? I'm just looking for the best way to dispose of that older fuel.
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02-24-2010, 11:15 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Jim,
There was an article in either AOPA or EAA magazine a few years back on this subject. They said 100LL had a shelf life of two years.
They went on to say mogas is good for one year.
__________________
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
www.repucci.com/bill/baf.html
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02-24-2010, 11:19 AM
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Join Date: Jan 2006
Posts: 934
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Thanks Bill, I'll do a search on EAA archive and see what I come up with.
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02-24-2010, 11:40 AM
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Join Date: May 2008
Location: central oregon
Posts: 1,089
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you could always add some to your car, make it around 10%-25% of the fuel and burn it up that way if you didn't want to put it in an airplane.
someone mentioned they use it in their lawnmower 
edit, mixing it in the airplane sounds good tome, i was thinking if it was put in a modern car it could foul the O2 sensors if to much at once was used. an older car would probably love it. 10 gallons over a couple tanks in a car probably won't do anything, but on second thought i was thinking i better mention the o2 sensor fouling just in case.
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nothing special here...
Last edited by Danny7 : 02-24-2010 at 12:14 PM.
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02-24-2010, 12:11 PM
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Join Date: Jan 2006
Posts: 934
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If I can find that article, I'd probably just mix a couple gallons at at a time in the RV since that that's been going through gas!
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02-24-2010, 12:15 PM
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Join Date: Dec 2007
Location: Conyers GA
Posts: 347
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Quote:
Originally Posted by Danny7
you could always add some to your car, make it around 10%-25% of the fuel and burn it up that way if you didn't want to put it in an airplane.
someone mentioned they use it in their lawnmower |
Bad idea, I did it and the lead in it tore up the catalytic converter.
Gary Specketer |
02-24-2010, 12:18 PM
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Join Date: May 2008
Location: central oregon
Posts: 1,089
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Quote:
Originally Posted by Gary 40274
Bad idea, I did it and the lead in it tore up the catalytic converter.
Gary Specketer
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ok, O2 sensors and catalytic converter. what exactly did the cat. do or not do anymore?
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02-24-2010, 12:30 PM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Quote:
Originally Posted by Danny7
ok, O2 sensors and catalytic converter. what exactly did the cat. do or not do anymore?
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The lead in the exhaust precipitates in the catalyst and eventually (more sooner than later) plugs it up. Lots of folks found this out the hard way back when both leaded and unleaded auto fuels were available.
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Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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02-24-2010, 12:31 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,122
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The lead will coat the platinum/rhodium catalyst used in the catalytic converter, poisoning it and rendering it unable to convert the CO and unburned fuel to water vapor and CO2. There is a post-converter oxygen sensor that will recognize this problem and set a trouble flag on the main computer.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
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02-24-2010, 12:33 PM
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Join Date: May 2008
Location: central oregon
Posts: 1,089
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Quote:
Originally Posted by longranger
The lead in the exhaust precipitates in the catalyst and eventually (more sooner than later) plugs it up. Lots of folks found this out the hard way back when both leaded and unleaded auto fuels were available.
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Yeah, but what does that mean? The car runs a little rough? i thought the cat converter was in the exhaust and tried to burn up a little more of the exhaust products to produce a "cleaner" exhaust gas, but i kind of thought they stop working after a certain mileage without lead anyway, so does it make a difference in driving?
saw your post greg, thanks. how long do those converters last in normal use?
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Last edited by Danny7 : 02-24-2010 at 12:35 PM.
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