Return-Path: Received: from [65.54.168.115] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 725518 for flyrotary@lancaironline.net; Fri, 11 Feb 2005 17:20:47 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.168.115; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 11 Feb 2005 14:20:01 -0800 Message-ID: Received: from 4.174.6.71 by BAY3-DAV11.phx.gbl with DAV; Fri, 11 Feb 2005 22:19:14 +0000 X-Originating-IP: [4.174.6.71] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Vapor lock Date: Fri, 11 Feb 2005 17:19:12 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00CE_01C5105D.CDF20380" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0009.2900 Seal-Send-Time: Fri, 11 Feb 2005 17:19:12 -0500 X-OriginalArrivalTime: 11 Feb 2005 22:20:01.0799 (UTC) FILETIME=[D4472970:01C51087] This is a multi-part message in MIME format. ------=_NextPart_000_00CE_01C5105D.CDF20380 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bottom posting this time.......... -----=20 > I'm not sure that I understand vapor lock completely. Is the = problem > that the fuel gets hot, or that the fuel boils and then the pumps no > longer work? > > I have a plan for a stone cold simple fuel system. With only one = tank > positioned high, I plan to put both fuel pumps directly under the = tank > which is located behind the cabin (tractor configuration). Position = the > fuel regulator beside the pump, and I will only having a single line > running out to the engine compartment. Think of it as one LONG = header. > The issue will be that the fuel will not 'circulate'. What goes out = to > the header at the engine will stay there till it gets used. > > Is this a prescription for 'vapor lock', or will any boiling fuel = simply > get blown through the injectors? > Hi, Ernest....I might have it wrong, but I seem to recall that I was = told to=20 put the fuel pressure regulator just AFTER the injectors/fuel rail. = That's=20 what I did...maybe that's part of my problem?=20 Paul Conner I'd say no, that (regulator position) was not the problem. What I = would want to know is how big is that header tank, where is it, what is = it made of, how is it vented and does it have to pull fuel through the = boost pump. That's where I'd look first. Tracy (very wary of sump tanks on EFI) ------=_NextPart_000_00CE_01C5105D.CDF20380 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bottom posting this time..........
-----

> I'm not sure that I = understand vapor lock completely.  Is the problem
> that = the fuel=20 gets hot, or that the fuel boils and then the pumps no
> longer=20 work?
>
> I have a plan for a stone cold simple fuel = system. =20 With only one tank
> positioned high, I plan to put both fuel = pumps=20 directly under the tank
> which is located behind the cabin = (tractor=20 configuration).  Position the
> fuel regulator beside the = pump, and=20 I will only having a single line
> running out to the engine=20 compartment.  Think of it as one LONG header.
> The issue = will be=20 that the fuel will not 'circulate'.  What goes out to
> the = header=20 at the engine will stay there till it gets used.
>
> Is = this a=20 prescription for 'vapor lock', or will any boiling fuel simply
> = get=20 blown through the injectors?
>
Hi, Ernest....I might have it = wrong,=20 but I seem to recall that I was told to
put the fuel pressure = regulator=20 just AFTER the injectors/fuel rail. That's
what I did...maybe = that's part=20 of my problem? 
 Paul Conner

I'd say no, that (regulator = position) was=20 not the problem.  What I would want to know is how big is that = header=20 tank, where is it, what is it made of, how is it vented and does = it have=20 to pull fuel through the boost pump.  That's where I'd look=20 first.
 
Tracy (very wary of sump tanks on=20 EFI)
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