From: "Todd Bartrim bartrim@gmail.com" <flyrotary@lancaironline.net>
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Date: Fri, 15 Feb 2019 17:06:10 -0800
Message-ID: <CALYfWBtKEiuLvNFOS9UZKzmrUM+dP-0OdbAH5fYttJkK7txOQQ@mail.gmail.com>
Subject: Re: [FlyRotary] new option for injection pumps
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Charlie;
   This is good for new builders and others having to do  rebuild or a
redesign, but I'd like to add my 2-bits for the benefit of any new builders
that are still early in the construction phase.
  I would seriously investigate the possibility of using an in-tank pump in
each tank. Especially if you are considering auxiliary tanks. My desire to
have inboard, outboard and tip tanks on each wing, caused untold amounts of
complexity in valving arrangements.
I really wish I'd at least considered in-tank pumps, but at the time I
wanted to use the same in-line pumps that everyone else was using
successfully.
  Another factor in my reluctance to use the in-tank pump was that at the
time they still required a return line that would have to be managed, but
today's in-tank pumps are usually returnless with the regulator built into
the pump.
  I can't say much more about them as I haven't investigated any more in
depth but I would encourage new builders to further explore the
possibilities of these as well as the one you mentioned.

Todd

On Fri, Feb 15, 2019, 16:35 Charlie England ceengland7@gmail.com, <
flyrotary@lancaironline.net> wrote:

> Hi guys,
>
> One of the things that drove me to add a 2nd alternator to my install is
> the relatively high current draw of the 'standard' Walbro GSL393 fuel
> pump (around 6A). I looked at using the little turbine pumps (around
> 3--4A), but they must be inside the tank(s) since they cannot self prime.
>
> Over on the VAF (RV-x) forum, there's a guy who's using the typical
> Bendix style injection on his Lyc, but wants to eliminate the engine
> driven pump. He's also (drastically) over- (and incorrectly) thinking
> that what's already available isn't safe, so he's embarked on his own
> research. Fortuitously, he turned up something that could be useful to
> us. Turns out that Walbro makes a smaller gerotor pump, that can supply
> 30 GPH (instead of 60), and only draws around 2.5A. Model is GSL414; a
> bit harder to find, but roughly the same $ as the 393. If I hadn't
> already done the alternator work and bought the pumps, I'd be giving
> this a serious look.
>
> Here's his testing thread, if anyone's interested.
>
> http://www.vansairforce.com/community/showthread.php?t=168793
>
> Charlie
>
>
> ---
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>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
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<span>Hi Charlie;=C2=A0</span><div>=C2=A0 =C2=A0This is good for new builde=
rs and others having to do=C2=A0 rebuild or a redesign, but I&#39;d like to=
 add my 2-bits for the benefit of any new builders that are still early in =
the construction phase.</div><div>=C2=A0 I would seriously investigate the =
possibility of using an in-tank pump in each tank. Especially if you are co=
nsidering auxiliary tanks. My desire to have inboard, outboard and tip tank=
s on each wing, caused untold amounts of complexity in valving arrangements=
.=C2=A0</div><div>I really wish I&#39;d at least considered in-tank pumps, =
but at the time I wanted to use the same in-line pumps that everyone else w=
as using successfully.=C2=A0</div><div>=C2=A0 Another factor in my reluctan=
ce to use the in-tank pump was that at the time they still required a retur=
n line that would have to be managed, but today&#39;s in-tank pumps are usu=
ally returnless with the regulator built into the pump.</div><div>=C2=A0 I =
can&#39;t say much more about them as I haven&#39;t investigated any more i=
n depth but I would encourage new builders to further explore the possibili=
ties of these as well as the one you mentioned.=C2=A0</div><div><br></div><=
div>Todd</div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Fri, =
Feb 15, 2019, 16:35 Charlie England <a href=3D"mailto:ceengland7@gmail.com"=
>ceengland7@gmail.com</a>, &lt;<a href=3D"mailto:flyrotary@lancaironline.ne=
t">flyrotary@lancaironline.net</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding=
-left:1ex">Hi guys,<br>
<br>
One of the things that drove me to add a 2nd alternator to my install is <b=
r>
the relatively high current draw of the &#39;standard&#39; Walbro GSL393 fu=
el <br>
pump (around 6A). I looked at using the little turbine pumps (around <br>
3--4A), but they must be inside the tank(s) since they cannot self prime.<b=
r>
<br>
Over on the VAF (RV-x) forum, there&#39;s a guy who&#39;s using the typical=
 <br>
Bendix style injection on his Lyc, but wants to eliminate the engine <br>
driven pump. He&#39;s also (drastically) over- (and incorrectly) thinking <=
br>
that what&#39;s already available isn&#39;t safe, so he&#39;s embarked on h=
is own <br>
research. Fortuitously, he turned up something that could be useful to <br>
us. Turns out that Walbro makes a smaller gerotor pump, that can supply <br=
>
30 GPH (instead of 60), and only draws around 2.5A. Model is GSL414; a <br>
bit harder to find, but roughly the same $ as the 393. If I hadn&#39;t <br>
already done the alternator work and bought the pumps, I&#39;d be giving <b=
r>
this a serious look.<br>
<br>
Here&#39;s his testing thread, if anyone&#39;s interested.<br>
<br>
<a href=3D"http://www.vansairforce.com/community/showthread.php?t=3D168793"=
 rel=3D"noreferrer" target=3D"_blank">http://www.vansairforce.com/community=
/showthread.php?t=3D168793</a><br>
<br>
Charlie<br>
<br>
<br>
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Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
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</blockquote></div></div>

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