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Jim Feldmann
Joined: 01 Sep 2008
Posts: 54
Location: Burbank, CA
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 Posted: Thu May 07, 2009 10:12 am Post subject: Fuel line growing |
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I just replaced all of the flexible fuel lines (wing tanks to header and firewall forward) with new Goodyear SAE 30R7 rubber fuel line. After a day or two I noticed that the lines seemed to have gotten longer, so I did a test.
Immersing a 3" long piece of fuel line in fuel for 48 hours caused it to grow to 3 1/8" long. I put a piece of Gates SAE 30R7 in with it, and it grew by exactly the same amount. Fortunately, the ID increased as well, so I am not immediately concerned that it will restrict the fuel flow, but clearly, the fuel is infiltrating the rubber.
The fuel I'm running right now is 50% 100LL, 50% 91 octane autogas and the appropriate amount of Decalin. There is no measurable ethanol in the mix.
It's been warm here, so I did a control test to see if temperature would cause expansion and contraction. I put a second 3" sample of each brand in the refrigerator for 48 hours. No change in the length of either one.
Has anyone experienced this.
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_________________
Jim Feldmann
Kitfox IV Speedster / 912 lost to prop failure
Building a Kitfox 5 Voyager |
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kitfoxsport(at)verizon.ne
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| Posted: Thu May 07, 2009 12:21 pm Post subject: Fuel line growing |
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You should use the Goodyear 30R9 if your using gas with ethanol. Has special blue lining for all types of fuel.
George
Sport Model - 914 / finished painting 5/1/09
do not archive
From: Jim Feldmann <feldesign(at)earthlink.net>
To: kitfox-list(at)matronics.com
Sent: Thursday, May 7, 2009 11:12:57 AM
Subject: Fuel line growing
--> Kitfox-List message posted by: "Jim Feldmann" <feldesign(at)earthlink.net (feldesign(at)earthlink.net)>
I just replaced all of the flexible fuel lines (wing tanks to header and firewall forward) with new Goodyear SAE 30R7 rubber fuel line. After a day or two I noticed that the lines seemed to have gotten longer, so I did a test.
Immersing a 3" long piece of fuel line in fuel for 48 hours caused it to grow to 3 1/8" long. I put a piece of Gates SAE 30R7 in with it, and it grew by exactly the same amount. Fortunately, the ID increased as well, so I am not immediately concerned that it will restrict the fuel flow, but clearly, the fuel is infiltrating the rubber.
The fuel I'm running right now is 50% 100LL, 50% 91 octane autogas and the appropriate amount of Decalin. There is no measurable ethanol in the mix.
It's been warm here, so I did a control test to see if temperature would cause expansion and contraction. I put a second 3" sample of each brand in the refrigerator for 48 hours. No change in the length of either one.
Has anyone experienced this.
--------
Jim Feldmann, 3rd owner
1994 Kitfox IV Speedster / 912
Working on my Sport Pilot Certificate
Read this topic online here:
http://forums.matronics.com/viewtopic.php? -Matt Drall
[quote][b]
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akflyer
Joined: 07 May 2007
Posts: 574
Location: Soldotna AK
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| Posted: Thu May 07, 2009 3:01 pm Post subject: Re: Fuel line growing |
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would be nice it you could get the fuel line to stay the game and have the gas levels in the tank increase like that lol
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DO NOT ARCHIVE
Leonard Perry aka SNAKE
Soldotna AK
Avid "C" / Mk IV
582 (147 hrs and counting on the rebuild)
IVO IFA
Full Lotus 1450
#1 snake oil salesman since 1-22-2009
I would rather die trying to live, than to live trying not to die.... |
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