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johnd(at)data-tech.com
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 Posted: Fri Jun 05, 2009 8:10 am Post subject: Gascolator Wierdness - fuel turning yellow... |
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Hi All,
I'm using the gascolator that came with my quickbuild on my 601XL. It
looks like an Aircraft Spruce part.
The last two times I've sumped fuel from the gascolator the 100LL has
been yellow in color, looks like a urine sample almost. The tanks sump
fine ie 100LL blue and once I clear out the yellow fluid the engine runs
fine. I've only run 100LL and no mogas.
In talking with my A&P/Tech Counselor we've come to the conclusion that
the color must be coming from the gascolator finish. I've removed the
bowl and it does appear the finish (alodine) is dissolving ?
Has anyone else seen this ? My A&P hasnt ever seen this before and he's
a pretty experienced guy.
Thanks,
John Davis
N601JD (at) 7A8
601XL - Jab 3300
Burnsville, NC
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tonyplane(at)bellsouth.ne
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| Posted: Fri Jun 05, 2009 9:35 am Post subject: Gascolator Wierdness - fuel turning yellow... |
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John,
In the beginning, I sumped a discoloration also for some time, rather
brownish/yellowish in color. I attributed it to the sealant I used in
installing all my fittings, a brown colored Permatex product I believe. I
also use the gascolator from the kit - no problems.
Tony Graziano
XL/Jab; N493TG; 497 hrs.
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david_a_g_johnson(at)btin
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| Posted: Fri Jun 05, 2009 10:15 am Post subject: Gascolator Wierdness - fuel turning yellow... |
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I've seen this too. I have an Andair gascolator.
I suspected that the discolouration was coming from the rubber fuel lines,
so I put some fuel in a glass bottle with a short length of fuel line. After
a few days, the fuel was a brownish yellow. I have left the bottle now for
several months and it hasn't got any darker, so I assume that it was
something on the surface of the rubber that was being dissolved, possibly
some sort of lubricant used in the manufacture.
My next step will be to replace the contaminated fuel in the bottle with
fresh to see if that gets discoloured. One day I may get around to doing it!
601XL ready for test flight - grounded (in the UK)
Dave Johnson
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geo
Joined: 27 Jun 2009
Posts: 1
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| Posted: Sat Jun 27, 2009 1:22 pm Post subject: Re: Gascolator Wierdness - fuel turning yellow... |
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Hello John, Yesterday the exact same problem happened to me with our club plane, 1976 PA 151. Fuel drained from the gascolator looked like a yellow urine sample. It eventually turned to blue. A local mechanic guessed it was car gas but that's not it. This has happened 2 times since an annual where a fuel line was changed.
I'm convinced it is something dissolving in the bowl. Another mechanic suggested looking in the bowl for an answer.
We saved a sample and may have an ave gas supplier analyze it if its not too much $. Keep me posted. Good Luck, George
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Sat Jun 27, 2009 2:51 pm Post subject: Gascolator Wierdness - fuel turning yellow... |
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The dyes used in avgas are designed to lose their color when two
different grades of avgas are mixed together. In this case, it may
just be that the blue dye in the avgas is reacting to some residue
left on the new fuel lines from the manufacturing process. As the
residue is flushed out of the system over time, the issue should go
away.
On Jun 27, 2009, at 5:22 PM, geo wrote:
| Quote: |
Hello John, Yesterday the exact same problem happened to me with our
club plane, 1976 PA 151. Fuel drained from the gascolator looked
like a yellow urine sample. It eventually turned to blue. A local
mechanic guessed it was car gas but that's not it. This has happened
2 times since an annual where a fuel line was changed.
I'm convinced it is something dissolving in the bowl. Another
mechanic suggested looking in the bowl for an answer.
We saved a sample and may have an ave gas supplier analyze it if its
not too much $. Keep me posted. Good Luck, George
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--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
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_________________
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Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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purplemoon99(at)bellsouth
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| Posted: Sat Jun 27, 2009 6:23 pm Post subject: Gascolator Wierdness - fuel turning yellow... |
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