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Date: Thu, 17 Feb 2005 13:02:48 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Vapor Lock
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<... tried removing it and heating the engine as in previous tests to 
see if you  get a vapor lock ...>
I wouldn't do that, at least permanently.  It was your Facet pump 
enabled you to re-prime the HP pump the last time it quit wasn't it?  
Your long lines to the selector are a MUCH bigger restriction than the 
Facet pump.  Even if it doesn't quit after you remove the Facet, you've 
given away the only way you have to re-prime the HP pump when it DOES 
quit again (and it probably will).  My fix would be to set your fuel 
system up like Tracy's.

Don't give away your restart capability ... Jim S.

Kelly Troyer wrote:

> Paul,
>   I have forgotton your exact fuel system layout.......Do your efi 
> pumps push
> fuel from sump tank to fuel valve then to engine or are they installed 
> after the
> fuel valve and suck fuel from all the way back to the sump tank  ?  I 
> tend to
> agree with Tracy and others that the Facet boost pump is a 
> restriction.....Have
> you tried removing it and heating the engine as in previous tests to 
> see if
> you  get a vapor lock ?
> --
> Kelly Troyer
> Dyke Delta/13B/RD1C/EC2
>
>     -------------- Original message from "Tracy Crook"
>     <lors01@msn.com>: --------------
>
>     The Facet pump in this position is a two edged sword.  It can help
>     eliminate a vapor lock when on but it is a restriction that can
>     create a vapor lock when off.   A properly laid out fuel system
>     should not require another pump to prime the main EFI pump.  It is
>     a bandaid IMO.  Again, any restriction other than a strainer to
>     stop the 'big chunks' before the EFI pumps is not a good thing.
>      
>     Tracy
>
>>          
>