X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from relay04.roc.ny.frontiernet.net ([66.133.182.167] verified) by logan.com (CommuniGate Pro SMTP 4.3.2) with ESMTP id 967734 for flyrotary@lancaironline.net; Mon, 30 May 2005 01:21:35 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.133.182.167; envelope-from=canarder@frontiernet.net Received: from filter02.roc.ny.frontiernet.net (filter02.roc.ny.frontiernet.net [66.133.183.69]) by relay04.roc.ny.frontiernet.net (Postfix) with ESMTP id 65BBB358148 for ; Mon, 30 May 2005 05:20:50 +0000 (UTC) Received: from relay04.roc.ny.frontiernet.net ([66.133.182.167]) by filter02.roc.ny.frontiernet.net (filter02.roc.ny.frontiernet.net [66.133.183.69]) (amavisd-new, port 10024) with LMTP id 32764-08-7 for ; Mon, 30 May 2005 05:20:50 +0000 (UTC) Received: from [127.0.0.1] (67-137-69-152.dsl2.cok.tn.frontiernet.net [67.137.69.152]) by relay04.roc.ny.frontiernet.net (Postfix) with ESMTP id E8ADF3580B4 for ; Mon, 30 May 2005 05:20:49 +0000 (UTC) Message-ID: <429AA2AA.8060801@frontiernet.net> Date: Mon, 30 May 2005 00:20:42 -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: will EFI pumps pump air was Re: Fuel Tank Selection References: In-Reply-To: Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit X-Antivirus: avast! (VPS 0521-5, 05/29/2005), Outbound message X-Antivirus-Status: Clean X-Virus-Scanned: by amavisd-new-20040701 (2.0) at filter02.roc.ny.frontiernet.net

Russell Duffy wrote:

Message
Now I'm not so worried, because each high pressure fuel
pump draws from it's own tank and the only point of inter- connection is where the lines join at the fuel rail(s).

This brings up a question that I've had before, and I'm not sure this is exactly what anyone is doing, so it's not meant that way.

Say you have two tanks, with an EFI pump for each tank. You then connect the output of each pump together, feeding into one line running to the fuel rail. The question is: What happens when one tank runs out of gas? Will the EFI pump move enough air through it to disturb the fuel rail pressure that's being delivered from the other pump, I would say yes or would it just stop pumping at that point, and do no harm (other than maybe burning the pump up eventually)?

Yep, still trying to figure out how to fix my fuel transfer system. What's it look like now?

Cheers,

Rusty