X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 08 May 2007 00:25:58 -0400 Message-ID: X-Original-Return-Path: Received: from [69.146.254.20] (HELO arilabs.net) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2031348 for lml@lancaironline.net; Mon, 07 May 2007 23:43:16 -0400 Received-SPF: none receiver=logan.com; client-ip=69.146.254.20; envelope-from=Kevin@arilabs.net Subject: Why is there fuel? MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C79122.E4FF2D4B" X-Original-Date: Mon, 7 May 2007 21:42:31 -0600 X-Original-Message-ID: <7141427652BB3049A7DBF1084B67805B0F7F6D@penumbra.arilabs.net> Content-class: urn:content-classes:message X-MimeOLE: Produced By Microsoft Exchange V6.5 X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Why is there fuel? Thread-Index: AceRIug8WXE4hAOFQPyKY2o2Ev0qeQ== From: "Kevin Stallard" X-Original-To: "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C79122.E4FF2D4B Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, =20 Actually the question really is, why does the IO-550 require an electric fuel pump (besides priming/starting)? =20 =20 Why is there both a low boost and high boost pump? Is this only for backup, or are there more sinister aspects of fuel delivery in the IO-550 at play here? In talking with a friend of mine, he mentions that the Lycoming io360 only has a low pressure fuel pump. =20 I remember a discussion about the TIO-550 and the fuel pump needs to be turned on above 10,000 feet. Why is this? This person I've been speaking to about this seemed to think it was to overcome vapor lock. Why doesn't the IO-360 need something like this? Does the IO-550 need to be treated in the same way? =20 Thanks Kevin =20 =20 =20 ------_=_NextPart_001_01C79122.E4FF2D4B Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

Actually the question really is, why does the IO-550 = require an electric fuel pump (besides priming/starting)? =

Why is there both a low boost and high boost pump? = Is this only for backup, or are there more sinister aspects of fuel delivery in = the IO-550 at play here? In talking with a friend of mine, he mentions = that the Lycoming io360 only has a low pressure fuel pump.

I remember a discussion about the TIO-550 and the = fuel pump needs to be turned on above 10,000 feet. Why is this? = This person I’ve been speaking to about this seemed to think it was to overcome vapor = lock. Why doesn’t the IO-360 need something like this? Does the IO-550 = need to be treated in the same way?

Thanks

Kevin

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