Return-Path: Received: from [206.46.170.103] (HELO out003.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 727697 for flyrotary@lancaironline.net; Sun, 13 Feb 2005 20:23:39 -0500 Received: from verizon.net ([4.12.145.173]) by out003.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20050214012335.LPRQ7729.out003.verizon.net@verizon.net> for ; Sun, 13 Feb 2005 19:23:35 -0600 Message-ID: <420FFD81.1090606@verizon.net> Date: Sun, 13 Feb 2005 20:23:13 -0500 From: Finn Lassen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Vapor lock in sump/header tank. References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------010008000809070209010004" X-Authentication-Info: Submitted using SMTP AUTH at out003.verizon.net from [4.12.145.173] at Sun, 13 Feb 2005 19:23:35 -0600 This is a multi-part message in MIME format. --------------010008000809070209010004 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I'm beginning to think that it takes very little heating to get vapour on the suction side of the pumps. Probably especially with auto gas. The lower the pressure, the lower the boiling point, right? Finn (still have not tried returning fuel from the "unused" pump to the tank) Ed Anderson wrote: > In Paul's case, I am not certain it was vapor lock since he mentioned > he found the his header tank cool to the touch. Certainly not a > definitive temperature sensor - but a reasonable one. Certainly not > to be discounted as a possible source of the problem and it > possibility needs to be confirmed or eliminated. --------------010008000809070209010004 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit I'm beginning to think that it takes very little heating to get vapour on the suction side of the pumps. Probably especially with auto gas. The lower the pressure, the lower the boiling point, right?

Finn (still have not tried returning fuel from the "unused" pump to the tank)

Ed Anderson wrote:

In Paul's case, I am not certain it was vapor lock since he mentioned he found the his header tank cool to the touch. Certainly not a definitive temperature sensor - but a reasonable one. Certainly not to be discounted as a possible source of the problem and it possibility needs to be confirmed or eliminated.

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