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sarg314(at)gmail.com
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 Posted: Thu Feb 11, 2010 3:46 pm Post subject: small fuel leak |
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At the point of having 0.4 hours on my engine (not flying yet), I have noticed a small fuel leak on one of the fittings on my AFP boost pump. The fitting just gets slightly wet with fuel. It's not fast enough to actually drip.
The leak is at one of the flared tubing fittings on the tube that comes out of the "back" of the pump, does quick 180 and goes 6 inches forward to a T. It's leaking at the T. I tried re-torquing the B nut (I use a fish scale on the end of the wrench to get the nominal torque value for the fitting) , but the next day it was wet again - just sitting there. Running the boost pump with the purge valve closed (to pump fuel from the left tank to the right) doesn't seem to provoke it to leak.
The next thing to do, I guess, is to remove this short run of tube, examine and clean all the the sealing surfaces and re-assemble it. I'd hate to try to make a new piece of tubing - that short 180 deg. bend would be hard to make. Of course, if I find that a flare has cracked, I'll have no choice.
Has any one else had this problem?
Is there any better way to deal with this?
Gee I hate plumbing.
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Tom Sargent, RV-6A, final assembly
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recapen(at)earthlink.net
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| Posted: Thu Feb 11, 2010 6:06 pm Post subject: small fuel leak |
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You can buy 37 degree 'gaskets' made out of very soft aluminum from aircraft spruce in at least the -4 and -6 sizes. The aluminum is soft enough that it will fill and seal minor imperfections.
I have more than one of them in my airplane - they're even on the 'approved' list according to ACS......
[quote] ---
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sarg314(at)gmail.com
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| Posted: Fri Feb 12, 2010 3:46 pm Post subject: small fuel leak |
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Ralph:
That sounds like a great idea. It's good to know there is something else to try.
On Thu, Feb 11, 2010 at 6:17 PM, Ralph E. Capen <recapen(at)earthlink.net (recapen(at)earthlink.net)> wrote:
| Quote: | You can buy 37 degree 'gaskets' made out of very soft aluminum from aircraft spruce in at least the -4 and -6 sizes. The aluminum is soft enough that it will fill and seal minor imperfections.
I have more than one of them in my airplane - they're even on the 'approved' list according to ACS......
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Tom Sargent
[quote][b]
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Ed Anderson
Joined: 10 Jan 2006
Posts: 475
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| Posted: Sat Feb 13, 2010 8:34 am Post subject: small fuel leak |
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Tom, I have also used the soft crushable aluminum AN fitting washers – they are cone shaped and will fit right over the male part of the fitting. They are very soft so handle with care.
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson(at)carolina.rr.com
http://www.andersonee.com
http://www.dmack.net/mazda/index.html
http://www.flyrotary.com/
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.rotaryaviation.com/Rotorhead%20Truth.htm[url=http://www.dmack.net/mazda/index.html][/url]
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of thomas sargent
Sent: Friday, February 12, 2010 6:34 PM
To: rv-list(at)matronics.com
Subject: Re: small fuel leak
Ralph:
That sounds like a great idea. It's good to know there is something else to try.
On Thu, Feb 11, 2010 at 6:17 PM, Ralph E. Capen <recapen(at)earthlink.net (recapen(at)earthlink.net)> wrote:
You can buy 37 degree 'gaskets' made out of very soft aluminum from aircraft spruce in at least the -4 and -6 sizes. The aluminum is soft enough that it will fill and seal minor imperfections.
I have more than one of them in my airplane - they're even on the 'approved' list according to ACS......
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Tom Sargent | Quote: | | http://www.matronics.com/Navigator?RV-List |
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[quote][b]
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Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com |
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