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Date: Sat, 19 Feb 2005 21:45:38 -0600
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Fuel system changes for SQ2000
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Paul wrote:

> Just an update regarding my heat soak/vapor lock fuel issue and fuel 
> system changes. I have successfully duplicated my vapor lock fuel 
> issue several times (on the ground this time). There is little to no 
> doubt that what I experienced was heat related.
>       I have firesleeved all fuel lines. I installed a vent line from 
> the top of the sump tank to the top of my left strake fuel tank. (This 
> can easily be removed or replaced with a shraeder valve).
>     I have been considering what Tracy, Herb Sanders and a few others 
> have said about the Facet fuel pump possibly being a problem.  I 
> temporarily disconnected the in-line Facet fuel pump and bypassed it 
> with a short length of 3/8" ID clear tubing.  While I had the Facet 
> pump disconnected, I found that I could not blow through it in the 
> direction that is opposite normal fuel flow.  It may be possible, as 
> many have suggested, that any bubbles in the fuel line that would 
> normally be able to work their way uphill and back into the main tanks 
> were prevented from doing so by the one-way Facet fuel pump.  I will 
> run the engine again until it is hot enough to go into it's dying 
> throes of fuel starvation, and observe if there are any bubbles in the 
> newly installed clear fuel line, working their way back towards the 
> tank. Of course if I am lucky and the bubbles work their way to the 
> tank and the engine does not starve for fuel, we may have something 
> here.  I think that the clear tubing may reveal some of it's hidden 
> secrets.  Can't hurt.  I figure the more information I can obtain from 
> my fuel system, the better understanding I will have of it.
>     I wish to thank Tracy, Ed, Herb, Al, Jim S, Kelly, Charlie, Perry, 
> Wendell, Mark, Dennis, Bulent, Bill, Tom, Bob, Marvin, Dave, George, 
> Leon, Todd, John, William, (OK I won't go through all the names like 
> an Oscar winner) for all of their input and suggestions. Jim Sower and 
> Herb Sanders even took the time to call me at home.  I am trying a few 
> suggestions one at a time and hopefully I will end up with a 
> vaporlock-free fuel system.
>      I have been searching the internet for prefabricated ram air 
> scoops similar to AL's, but so far, most are for car hoods, and too 
> large.  I know I can make one....just getting lazy, and would rather 
> pay for one and be done with it. Thanks again to all who offerd advise 
> and ideas.  I will post results soon.  Take care.  Paul Conner

It'll still require some work, but this might be a start:

http://www.vansaircraft.com/cgi-bin/catalog.cgi?ident=1108870687-120-474&browse=engines&product=cowl-airscoop


Charlie