X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 968237 for flyrotary@lancaironline.net; Mon, 30 May 2005 17:15:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=sladerj@bellsouth.net Received: from ibm62aec.bellsouth.net ([65.2.91.3]) by imf20aec.mail.bellsouth.net with ESMTP id <20050530211443.IDQF2220.imf20aec.mail.bellsouth.net@ibm62aec.bellsouth.net> for ; Mon, 30 May 2005 17:14:43 -0400 Received: from JSLADE ([65.2.91.3]) by ibm62aec.bellsouth.net with ESMTP id <20050530211443.YXAR8050.ibm62aec.bellsouth.net@JSLADE> for ; Mon, 30 May 2005 17:14:43 -0400 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: will EFI pumps pump air Date: Mon, 30 May 2005 17:14:41 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A7_01C5653B.111F58B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_00A7_01C5653B.111F58B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit MessageBe careful with the system of pumping from one tank and returning to the other. With the flow rates that an EFI pump returns to the tank, it would require very active tank managment to avoid sucking the one tank dry. Yep! Been there. Done that. Didn't like it. Another problem with this is that returning to a full tank tends to deposit a lot of you're fuel over a wide area :( I have separate tanks, pumps and filters on each side. Return is switched by a solenoid energized by switching the left pump on. This leads to its own set of fuel management issues, but it keeps the total redundancy I was looking for. Since we're analyzing fuel systems, I'd welcome any comments. John (EM2 up and running. Checking EC2 wiring over & over) ------=_NextPart_000_00A7_01C5653B.111F58B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Be careful with the system of pumping = from one tank=20 and returning to the other. With the flow rates that an EFI pump returns = to the=20 tank, it would require very active tank managment to avoid sucking the = one tank=20 dry.  
Yep!=20 Been there. Done that. Didn't like it.
Another problem with this is that returning to a full tank = tends to=20 deposit a lot of you're fuel over a wide area :(
 
I have=20 separate tanks, pumps and filters on each side. Return is switched by a = solenoid=20 energized by switching the left pump on. This leads to its own set of = fuel=20 management issues, but it keeps the total redundancy I was looking for. = Since=20 we're analyzing fuel systems, I'd welcome any = comments.
 
John=20 (EM2 up and running. Checking EC2 wiring over &=20 over)
 
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