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jrgowing(at)bigpond.net.a
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 Posted: Fri Jun 06, 2008 12:11 am Post subject: Fuel Sight Gague Tubing |
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Dear David
You have no doubt solved your sight tube composition request long ago but
as I remember it now it was to be Polyurethane.
JR (Bob) Gowing UK Kit 327 sanding wings in Oz.
do not archive
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raimo.toivio(at)rwm.fi
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| Posted: Fri Jun 06, 2008 3:18 am Post subject: Fuel Sight Gague Tubing |
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Hi
The nicest Fuel Sight Gauge Tubing I have ever seen
is in Steve Pittīs Europa Tri-Gear G-SMDH.
It is like pro aerofactory made with alu collar. Safe and beautiful.
I saw it here in Finland couple of days ago but was so impressed
did not understand to take a pic of it. Ask him more details!
Raimo
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h&jeuropa
Joined: 07 Nov 2006
Posts: 650
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| Posted: Fri Jun 06, 2008 3:44 am Post subject: Re: Fuel Sight Gague Tubing |
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The factory supplied sight gauge tubing is polyurethane. After a couple of years I noted that it was getting quite hard. I searched the Tygon website and discovered "fuel line" tubing, Tygon 4040. I changed out the tubing in our Europa to that during our rebuild. I later discovered that Tygon 4040 was supplied with the Long Range tank, and the length of it installed in our main tank had become quite hard and opaque! Back to the Tygon website. There I found Tygon SE 200 which is PVC with a Teflon liner. Other web searches revealed that Teflon is the preferred material to resist gasoline.
I purchased samples of Tygon SE200, 4040, Tygothane C210A (polyurethane without plasticizers) and Tygon 2075 (high chemical resistance) that I have been testing for about 3 weeks so far. I filled a 6 inch length of each with auto gasoline and sealed both ends. SE200 has lost the least amount of gasoline so far, about 1". 4040 has lost 4" and C210A has lost 3". 2075 was empty the next day!
I also put short pieces of each in a jar of gasoline. 4040 and C210A haven't shown any change yet. SE200 the PVC has shrunk leaving a portion of the Teflon sleeve exposed at each end. 2075 has swelled up from it's original 1/4" ID to more than 3/8" ID.
My conclusion so far, is SE200 is the best for a sight gauge or any application where fuel will not be in contact with the outside. Tygothane C210A is probably best where fuel will be in contact with the outside. This is based on my experience with 4040. I'm continuing the testing to see long term effects.
All of the Tygon tubing is available from McMaster.
Hope this helps.
Jim & Heather
N241BW getting close to flying again
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