From: "Saro Marcarian" <flyrotary@lancaironline.net>
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Date: Tue, 22 Aug 2017 18:18:44 +0000 (UTC)
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message-ID: <1860379779.2998731.1503425924315@mail.yahoo.com>
In-Reply-To: <list-10034345@logan.com>
References: <list-10034345@logan.com>
Subject: Re: [FlyRotary] Heat Soak & Fuel Purge valve- Another half baked
 idea?
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Todd Bartrim >>=C2=A0Instead of going back to a return type system I was th=
inking about a push-button operated solenoid valve that would tee into the =
fuel line before the regulator and return fuel to a main tank only while th=
e button is pushed. It would have to be mounted before the regulator so tha=
t it would be able to vent hot fuel when the pumps can't reach enough press=
ure to open the regulator. And because it would only open when the button i=
s held there would be no worries about accidentally pumping fuel overboard =
through a vent from an already full tank.
=C2=A0 So the thought is that I fly to some airport, taxi in to get that $1=
00 hamburger, back out an hour later, heat soak leaves me unable to get any=
 fuel pressure so I hold that button in for a minute while my facet pumps m=
ove cool fuel into the system and hi-press pump starts doing it's hi-press =
thing, let go of the button and start as usual.

Todd-
So this also comes from the Half Bakery. =C2=A0Instead of plumbing in anoth=
er valve and hose, why not WIRE in something that just holds your injectors=
 open to purge the fuel vapors? =C2=A0I'm not sure what quantity of fuel va=
por we'd be talking about, but it would seem an easy thing to try.
Not knowing the amount (mass) of fuel that may have vaporized, this may or =
may not be a good idea. =C2=A0So you might wind up with a prime - or with a=
 flood. =C2=A0Or a spectacular flame out your exhaust?
-Saro=20
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<html><head></head><body><div style=3D"font-family:Helvetica Neue, Helvetic=
a, Arial, sans-serif;font-size:16px;">Todd Bartrim &gt;&gt;&nbsp;Instead of=
 going back to a return type system I was thinking about a push-button oper=
ated solenoid valve that would tee into the fuel line before the regulator =
and return fuel to a main tank only while the button is pushed. It would ha=
ve to be mounted before the regulator so that it would be able to vent hot =
fuel when the pumps can't reach enough pressure to open the regulator. And =
because it would only open when the button is held there would be no worrie=
s about accidentally pumping fuel overboard through a vent from an already =
full tank.<br>&nbsp; So the thought is that I fly to some airport, taxi in =
to get that $100 hamburger, back out an hour later, heat soak leaves me una=
ble to get any fuel pressure so I hold that button in for a minute while my=
 facet pumps move cool fuel into the system and hi-press pump starts doing =
it's hi-press thing, let go of the button and start as usual.<br><div><br><=
/div><div>Todd-</div><div><br></div><div>So this also comes from the Half B=
akery. &nbsp;Instead of plumbing in another valve and hose, why not WIRE in=
 something that just holds your injectors open to purge the fuel vapors? &n=
bsp;I'm not sure what quantity of fuel vapor we'd be talking about, but it =
would seem an easy thing to try.</div><div><br></div><div>Not knowing the a=
mount (mass) of fuel that may have vaporized, this may or may not be a good=
 idea. &nbsp;So you might wind up with a prime - or with a flood. &nbsp;Or =
a spectacular flame out your exhaust?</div><div><br></div><div>-Saro</div> =
</div></body></html>
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