X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 01 Feb 2012 07:45:20 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-mealy.atl.sa.earthlink.net ([209.86.89.69] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with ESMTP id 5372232 for lml@lancaironline.net; Tue, 31 Jan 2012 19:50:45 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.69; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=hiKojJ0pXs5NuRtx8SCEXhTRzRzxJ4Tdejl+6E2mN0vM/C9ZoMKFASGN5zFrbVxr; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [72.73.82.72] (helo=[192.168.1.24]) by elasmtp-mealy.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1RsO0d-0007Kb-IA for lml@lancaironline.net; Tue, 31 Jan 2012 19:25:11 -0500 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-203--291123904 Subject: Re: [LML] Legacy fuel vent check valves. X-Original-Date: Tue, 31 Jan 2012 19:25:10 -0500 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <0AB519A7-3AF1-4889-9F74-2C02460FCFC3@earthlink.net> X-Mailer: Apple Mail (2.1084) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da94097e5c377ddd1d7bbf3a7b55511102dad350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 72.73.82.72 --Apple-Mail-203--291123904 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii I'm not familiar with the Legacy check valves. If you are using the = Andair ones, obviously the arrow has to point to the tank. I had mine = apart for testing. What's inside is an arrangement that switches (when = there is an outword pressure) from about 8 biggish holes for air passing = into the tank to two tiny holes for letting fuel out for expansion. = The tiny holes are enough to make a noticeable dribble but not much = more. You need them also for air in the tank to expand if you are = climbing aggressively. (Actually my tests said they need to be about = twice as big to accomodate a 50 gallon tank going to 20,000 feet in 10 = minutes). The other bit is how you route the vent line once it leaves the tank. = You would like it to go to the highest possible point on the wingtip to = improve your changes of being above the fuel. On a IV I would put the = check valve up there too (or just slightly on the tank side of the = highest point). Not sure what considerations there are for a legacy. On Jan 31, 2012, at 3:30 PM, Bill Bradburry wrote: I am concerned that the fuel vent check valves may be installed = backwards or are leaking. The fuel tanks seem to vent ok and I have not = seen any problems along those lines, but fuel runs out of the vents in = the wing tips any time I get much over a half to three quarters of a = tank. =20 Anyone else having this problem or have advice? =20 Bill B --Apple-Mail-203--291123904 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii I'm not familiar with the Legacy check valves. = If you are using the Andair ones, obviously the arrow has to point = to the tank. I had mine apart for testing. What's inside is = an arrangement that switches (when there is an outword pressure) from = about 8 biggish holes for air passing into the tank to two tiny holes = for letting fuel out for expansion. The tiny holes are enough to = make a noticeable dribble but not much more. You need them also = for air in the tank to expand if you are climbing aggressively. = (Actually my tests said they need to be about twice as big to = accomodate a 50 gallon tank going to 20,000 feet in 10 = minutes).

The other bit is how you route the vent = line once it leaves the tank. You would like it to go to the = highest possible point on the wingtip to improve your changes of being = above the fuel. On a IV I would put the check valve up there too = (or just slightly on the tank side of the highest point). Not sure = what considerations there are for a legacy.

On = Jan 31, 2012, at 3:30 PM, Bill Bradburry wrote:

I am concerned that the fuel vent = check valves may be installed backwards or are leaking. The fuel = tanks seem to vent ok and I have not seen any problems along those = lines, but fuel runs out of the vents in the wing tips any time I get = much over a half to three quarters of a = tank.

Anyone else having this problem or = have advice?

Bill = B

= = --Apple-Mail-203--291123904--