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Date: Sun, 7 Nov 2010 21:28:55 -0600
Message-ID: <AANLkTikXGQhsCsaz7Y870vmTqaF=Lu+9LrooDq4g82M-@mail.gmail.com>
Subject: Fuel "Self-transfer"
From: Bill Eslick <wgeslick@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Brian,

I have noticed over the years that if left on a slight incline, fuel will
migrate one way or the other.  Usually takes overnight to notice, though.  I
have a similar system, but the facet pump is on the front of the wing spar
under my seat.

Bill Eslick
RV-6 13B NA RD-1 EC-2 700+ hours


On Sun, Nov 7, 2010 at 7:56 PM, <bktrub@aol.com> wrote:

********************
>
>
> Here's another unrelated  issue- I have an RV-4, with the fuel being taken
> out of and returned only to the right tank. I have an AN-6 line feeding a
> facet pump located just aft of the batteries, and it transfers fuel to my
> righ hand tank when I want to transfer the fuel.Both tanks are vented
> separately. Here's the problem: I started out with 12. 5 gallons in the
> right tank, and 6.5 in the left. After running the engine on the ground for
> 1 hour, I ended up with 12.7 gallons in the right and 1.7 in the left,
> without ever having run the transfer pump. The only thing I can think of
> having happened is that the plane was parked slightly- 1 degree or so-right
> wing down. The facet pump I believe has a one way valve which would allow
> fuel to flow  downhill to the right tank. That's my theory, can anyone else
> offer a theory as to why the fuel is self transfering?
>
> Brian Trubee
> RV-4
>
>

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Brian,<br><br>I have noticed over the years that if left on a slight inclin=
e, fuel will migrate one way or the other.=A0 Usually takes overnight to no=
tice, though.=A0 I have a similar system, but the facet pump is on the fron=
t of the wing spar under my seat.<br>
<br>Bill Eslick<br>RV-6 13B NA RD-1 EC-2 700+ hours<br><br><br><div class=
=3D"gmail_quote">On Sun, Nov 7, 2010 at 7:56 PM,  <span dir=3D"ltr">&lt;<a =
href=3D"mailto:bktrub@aol.com">bktrub@aol.com</a>&gt;</span> wrote:<font co=
lor=3D"black"><font size=3D"2"><font face=3D"arial"><br>
<br>********************</font></font></font><blockquote class=3D"gmail_quo=
te" style=3D"margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204=
, 204); padding-left: 1ex;"><font size=3D"2" color=3D"black" face=3D"arial"=
><div>
=A0</div>


<div>Here&#39;s another unrelated =A0issue- I have an RV-4, with the fuel b=
eing taken out of and returned only to the right tank. I have an AN-6 line =
feeding a facet pump located just aft of the batteries, and it transfers fu=
el to my righ hand tank when I want to transfer the fuel.Both tanks are ven=
ted separately.=A0Here&#39;s the problem: I started out with 12. 5 gallons =
in the right tank, and 6.5 in the left. After running the engine on the gro=
und for 1 hour, I ended up with 12.7 gallons in the right and 1.7 in the le=
ft, without ever having run the transfer pump. The only thing I can think o=
f having happened is that the plane was parked slightly- 1 degree or so-rig=
ht wing down. The facet pump I believe has a one way valve which would allo=
w fuel to flow=A0 downhill to the right tank. That&#39;s my theory, can any=
one else offer a theory as to why the fuel is self transfering?</div>



<div>=A0</div>


<div>Brian Trubee</div>


<div>RV-4 <br>
</div>


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