X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [129.116.87.143] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1002748 for flyrotary@lancaironline.net; Wed, 15 Jun 2005 09:06:48 -0400 Received-SPF: none receiver=logan.com; client-ip=129.116.87.143; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [FlyRotary] Re: fuel pump mounting ( fuel system architecture) Date: Wed, 15 Jun 2005 08:06:01 -0500 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E016C1A23@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: fuel pump mounting ( fuel system architecture) Thread-Index: AcVxqavMxm+/ta6TQcC75uUT9PtFfgAALqMA From: "Mark R Steitle" To: "Rotary motors in aircraft" Bernie, I'm running Tracy's efi pumps. The main pump is mounted low on the firewall, and the boost pump is just after the Andair valve. I wanted it as low as possible, in a cool location, and as close to the tanks as I could get it. I may move the main pump to the same location, but I'm concerned about having pressurized fuel in the cabin. =20 Mark -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of WALTER B KERR Sent: Wednesday, June 15, 2005 7:53 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: fuel pump mounting ( fuel system architecture) On Wed, 15 Jun 2005 07:12:04 -0500 "Mark R Steitle" writes: I think that makes a big difference=20 > in > whether or not a bleed circuit is needed. The closer to the tanks,=20 > the > less the need for it. I had discovered a potentially fatal design=20 > flaw > and found a simple remedy. With air in the lines, the efi pumps=20 > simply > could not overcome the back pressure from the pressure regulator=20 > until > they were well primed. --------------------------------------------- Hi Mark, Makes me feel better now that I understand you are returning fuel to the tank. What pumps are you running because the Walbro pumps seem to reprime with or without air in the line at least under all conditions I run into. Seems like Al G said he has similar experience. My pumps are about 5 feet of #6 line from the tank and maybe 12 inches higher than the tank. Bernie >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html