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From: "Paul" <sqpilot@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-740930@logan.com>
Subject: Re: [FlyRotary] Re: Vapor Lock
Date: Tue, 15 Feb 2005 21:23:59 -0600
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Hi, Marv....sorry, I saw only part of the message (cut) and it was out of 
context.  Regarding my surge tank, yes it is gravity fed, however when doing 
aerobatics, I like the warm fuzzy feeling I get when I switch on the facet 
fuel pump.  Paul Conner

----- Original Message ----- 
From: "Marvin Kaye" <marv@lancaironline.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, February 15, 2005 8:50 PM
Subject: [FlyRotary] Re: Vapor Lock


> Hi Paul,
>
> The system I described in my prior post was one that didn't include a sump 
> or header tank... fuel flow was direct from the wing tanks.  Component 
> sequence was as follows:
> wing tanks > shutoff ball valves > fuel filters > HP fuel pumps > 
> secondary bypass circuits > fuel selector > fuel pressure transducer > 
> fluel flow transducers > firewall penetration > T to split flow to fuel 
> rails > fuel rails > FP regulator > return through fuel selector to 
> selected tank
>
> The shutoff ball valves are hidden in the wing root fairings and allow 
> flow from the tanks to be disabled to make it possible to remove & service 
> the filters and pumps without having to drain the tanks.  Their handles 
> are oriented so that they cannot be closed when their access panels are 
> installed.
>
> If your "sump" tank is truly a sump, I don't understand the need for the 
> Facet boost pump... the sump should be fed by gravity from the mains.  If 
> it needs to have fuel pumped up to it then it's a header.
>
>   <marv>
>
>
>
> "Paul" <sqpilot@bellsouth.net> wrote:
>
>  I'm a little confused...I have both.  I have a facet low pressure boost 
> pump
> between the fuel selector and sump tank, and two high pressure EFI pumps 
> after
> the sump tank, before the engine.  Paul Conner
>   ----- Original Message -----
>   From: WRJJRS@aol.com
>   To: Rotary motors in aircraft
>   Sent: Monday, February 14, 2005 2:15 PM
>   Subject: [FlyRotary] Re: Vapor Lock
>  In a message dated 2/13/2005 10:09:15 AM Pacific Standard Time,
> marv@lancaironline.net writes:
>  Other folks have reported fuel flow problems when they located their 
> pumps
>     between the engine and fuel selector instead of between the fuel 
> selector
> and
>     tanks... mostly the cause was air being sucked past the fuel 
> selector's
> seals
>     causing some air to be introduced into the fuel flow.
>  Good Point Marv,
>   Bill Jepson
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