X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 64 [XX] (50%) URL: contains host with port number (25%) RECEIVED: Received headers not consistent with Yahoo! "FROM:" (25%) HEADERS: mail has X-MSPriority flag but missing "X-MimeOLE" header Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 08 May 2007 02:35:36 -0400 Message-ID: X-Original-Return-Path: Received: from global.delionsden.com ([66.150.29.112] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTPS id 2031407 for lml@lancaironline.net; Tue, 08 May 2007 01:20:30 -0400 Received-SPF: none receiver=logan.com; client-ip=66.150.29.112; envelope-from=n103md@yahoo.com Received: from bmackey by global.delionsden.com with local (Exim 4.62) (envelope-from ) id 1HlI6e-0005Jx-8b for lml@lancaironline.net; Tue, 08 May 2007 01:19:24 -0400 Received: from 69.12.132.145 ([69.12.132.145]) (SquirrelMail authenticated user bmackey) by www.bmackey.com with HTTP; Mon, 7 May 2007 22:19:24 -0700 (PDT) X-Original-Message-ID: <4913.69.12.132.145.1178601564.squirrel@www.bmackey.com> X-Original-Date: Mon, 7 May 2007 22:19:24 -0700 (PDT) Subject: IO-550 fuel injection From: "bob mackey" X-Original-To: lml@lancaironline.net User-Agent: SquirrelMail/1.4.8 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - global.delionsden.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [32015 2012] / [47 12] X-AntiAbuse: Sender Address Domain - yahoo.com X-Source: X-Source-Args: X-Source-Dir: Kevin Stallard asks: > 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. Search the web archives for "IO-550 fuel injection system" or "Boost pump use" or "Summary - when to turn on the fuel boost pump". There was considerable discussion starting 1 Feb 2007 and going for about a week. Of particular interest is an article from Gary Casey on how the Continental fuel injection system meters (or fails to meter) the fuel flow. http://lancaironline.net:81/lists/lml/Message/39747.html The thread is summarized here: http://lancaironline.net:81/lists/lml/Message/39857.html