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From: "jesse farr" <jesse@jessfarr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1002718@logan.com>
Subject: Re: [FlyRotary] Re: Engine Not Starting
Date: Wed, 15 Jun 2005 09:47:15 -0400
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I don't know nothing (actually pretty much anything) about any of this but 
that has never stopped me from having and voicing an opinion; so, if 
injectors only fire small percentage of time and fuel & compressed air flow 
not sufficient at times to clear out in time to get started while flying ac, 
bleed return definitly sounds like good idea. But, if sufficiently far away 
from injectors, then even though now have flow established to the bleed 
point, you will still have slow go to purge remaining compressed air, vapor 
and allow fuel to actually flow from there to injectors and inject. It may 
just take a few seconds longer but that is still a tight a-- time of flying, 
starting, praying, cursing own stupidity, etc.. Could I suggest might be 
better to put bleed point at end of fuel rail so as to pass vapor all the 
way more quickly ? After all, small orfice and line return to tank shouldn't 
create that much more of a problem. Is there some other problem there that I 
simply do not know enough to understand ?
jofarr, soddy tn

----- Original Message ----- From: "Mark R Steitle" 
<mark.steitle@austin.utexas.edu>

My bleed circuit is about midway up on the firewall, and definitely not
at the highest point in the system.  I'm not convinced that it needs to
be at the highest point.  The reason is that if you have an airlock,
preventing the pump from priming, the engine won't be running at that
time.  As soon as the pump is able to re-prime, it will start flowing
30+ gpm of fuel.  If you're returning fuel back to the tank, the air
will be forced out of the fuel rail and back to the tank, and you're
back in business.

This is a bit different approach from what Leon posted, so there may be
some merit to having the bleed at the highest point.  It certainly
wouldn't hurt any, but I have had positive results with my system and
placing it near the pressure regulator made the plumbing simpler.