X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 10 May 2007 15:11:32 -0400 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 5.1.8) with ESMTP id 2036328 for lml@lancaironline.net; Thu, 10 May 2007 13:56:30 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.69; envelope-from=rtitsworth@mindspring.com DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=mindspring.com; b=Yl4gM2WvbnWtDglu41qEwVkxBv4z193adaJFMiqwptTT7mRafZZz4f2133udYl3d; h=Received:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Mailer:X-MimeOLE:Thread-Index:In-Reply-To:X-ELNK-Trace:X-Originating-IP; Received: from [69.3.253.171] (helo=RDTVAIO) by elasmtp-mealy.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1HmCro-0003HF-DG for lml@lancaironline.net; Thu, 10 May 2007 13:55:52 -0400 From: "rtitsworth" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: IO-550 fuel injection X-Original-Date: Thu, 10 May 2007 13:55:28 -0400 X-Original-Message-ID: <005f01c7932c$65715a00$84affea9@RDTVAIO> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 Thread-Index: AceTKNcYQbXPU91ORmeMqRbrWabCqAAAQ3oA In-Reply-To: X-ELNK-Trace: b17f11247b2ac8f0a79dc4b33984cbaa0a9da525759e26545f0a74e1044bb5806e6b8ad9d9453fd21ee4b264fab01f9d350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 69.3.253.171 Eugene, More (silly) thoughts... At first it seemed as if the symptoms could be related to a partially plugged vent line (bugs, dirt, etc), which was perhaps aggravated by some moisture. However, it seems unlikely that both lines would be plugged and that the results would be so binary at the same time. Thus, I'd first focus on the common components. To test the vent line, open the filler cap and suck on the vent line (naca end). DON'T BLOW ON THE VENT LINE, AS ANY FOD MAY BE FORCED INTO THE TANK. Also naturally, caution against inhaling any fuel and/or vapor. What about an intermittent suction leak between the boost pump and the mech fuel pump? The mech pump would then just draw air (versus fuel). You would think that a loose fitting (etc) would also leak fuel - but I've seen poor fittings that would suck air and yet not drip/spray liquid. The mech fuel pump has a case seal (and associated drain). If the case seal fails, does/can the pump draw air??? If you run the boost pump with the engine off and the mech pump case seal has failed, will fuel typically run/drip out the drain? (that's my assumption as a test). Do your injector drains and fuel pump case drain all run together (making individual ID difficult)? Still unknown as to why it (seemingly) fixed itself and/or whether the humidity had any relevance. At 12.5 GHP it sounds like you were LOP (guess). Were you at similar power settings on the later return trip when things were fine? Rick