X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from relay01.roc.ny.frontiernet.net ([66.133.182.164] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1001943 for flyrotary@lancaironline.net; Tue, 14 Jun 2005 15:44:33 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.133.182.164; envelope-from=canarder@frontiernet.net Received: from filter06.roc.ny.frontiernet.net (filter06.roc.ny.frontiernet.net [66.133.183.73]) by relay01.roc.ny.frontiernet.net (Postfix) with ESMTP id 05B10365AED for ; Tue, 14 Jun 2005 19:42:18 +0000 (UTC) Received: from relay01.roc.ny.frontiernet.net ([66.133.182.164]) by filter06.roc.ny.frontiernet.net (filter06.roc.ny.frontiernet.net [66.133.183.73]) (amavisd-new, port 10024) with LMTP id 13077-09-68 for ; Tue, 14 Jun 2005 19:42:17 +0000 (UTC) Received: from [127.0.0.1] (67-137-78-176.dsl2.cok.tn.frontiernet.net [67.137.78.176]) by relay01.roc.ny.frontiernet.net (Postfix) with ESMTP id 85176365804 for ; Tue, 14 Jun 2005 19:42:17 +0000 (UTC) Message-ID: <42AF3316.50409@frontiernet.net> Date: Tue, 14 Jun 2005 14:42:14 -0500 From: Jim Sower User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040514 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: fuel pump mounting ( fuel system architecture) References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Antivirus: avast! (VPS 0524-1, 06/14/2005), Outbound message X-Antivirus-Status: Clean X-Virus-Scanned: by amavisd-new-20040701 (2.0) at filter06.roc.ny.frontiernet.net I may have missed something, but did John just draw fuel out of the can up to the pump on the bench and dump it right back in the can, or did he route it through the regulator to build up pressure and then dump it back to the bucket on the floor? I can see the pump self priming with no back pressure from the regulator and rail, but I can't see it pumping air up to 35 - 40 psi against the regulator while trying to self prime. What did I miss? How exactly did John do his test? ... Jim S. John Slade wrote: >>>I did an experiment with the pump on a 4 foot bench, and a gas can >>>on the >>>floor. The pump primed itself with no difficulty. Having said that, >>>a >>>scenario like this in a plane would be just asking for vapor lock. >>> >>> >>> >>----------------------------------------------- >> >>Hi John, I like your test but do not understand your conclusion. >> >> >The conclusion wasn't based on the results of the experiment :) >It's my understanding that you need to replicate the temperatures and >pressures for the experiment to be entirely valid. > > > >>If the pump will prime with a 4 foot negative head that sounds good to me. >> >> >But this only proves it works on the bench under atmospheric pressure and >ambient temperature. > >John > > > > > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html >>> >>> > > > >