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04-03-2007, 06:28 AM
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Join Date: Mar 2007
Location: UK
Posts: 65
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Silt in fuel system
We have a newly aquired RV9a. It is o-320 powered, and so far we have put 20 hours on it with no problem. We have been using AVGAS and MOGAS about 50/50.
We have recently noticed varying levels of particles when the fuel is checked pre flight. It initially looked like sand, but closer inspection shows small brown, gray and white flakes. When rubbed between the fingers, it disolves up in the fuel, so I am guessing that that is how it got there.
I have read about MOGAS giving a brown residue, but can not find any detail.
Have others had similar experiences, or can offer advice.
I feel a switch back to 100% AVGAS is coming!
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04-03-2007, 09:36 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Fuel Lube
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Originally Posted by justinmg
We have a newly aquired RV9a. It is o-320 powered, and so far we have put 20 hours on it with no problem. We have been using AVGAS and MOGAS about 50/50.
We have recently noticed varying levels of particles when the fuel is checked pre flight. It initially looked like sand, but closer inspection shows small brown, gray and white flakes. When rubbed between the fingers, it disolves up in the fuel, so I am guessing that that is how it got there.
I have read about MOGAS giving a brown residue, but can not find any detail.
Have others had similar experiences, or can offer advice.
I feel a switch back to 100% AVGAS is coming!
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Excess Fuel Lube?
gil in Tucson
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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04-04-2007, 01:30 PM
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Join Date: Mar 2007
Location: Upper ny
Posts: 78
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Yucky gas
All gas can get contaminated. Get into the routine of flushing out your tanks and cleaning the fuel system before you have problems. If you don't fly your plane, enough, you can keep draining your tanks for the car and you'll always have fresh fuel in your Vans.
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04-04-2007, 01:42 PM
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Join Date: Feb 2005
Location: Austin, TX
Posts: 225
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huh? avgas in a car? really?
I
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f you don't fly your plane, enough, you can keep draining your tanks for the car and you'll always have fresh fuel in your Vans.
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i was always under the impression that the lead in avgas would do nasty things to your catalytic converter. unless, of course, you have a '65 mustang without one :-) i'm sure someone will correct me if i'm wrong.
john
__________________
john prickett (VAF 449)
manchaca, tx (suburb of austin)
rv-7a finish kit
N337JP (reserved)
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04-04-2007, 02:10 PM
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Join Date: Jan 2006
Location: Belgium
Posts: 645
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"Unleaded only"
Phil, doesn't your car have an "unleaded fuel only" sticker, somewhere ?
Do check!
Regards, PilotTonny.
__________________
"Pilottonny"
Tonny Tromp
Lanaken, Belgium (EU)
RV9A, Registration: PH-VAN 
ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
Sold
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04-04-2007, 02:10 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,122
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The catalytic converter, and your oxygen sensors as well. Burn it in the lawn mower.
__________________
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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