From: "Andrew Martin" <flyrotary@lancaironline.net>
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Date: Fri, 17 Mar 2017 19:05:26 +0800
Message-ID: <CAJxaVD01d9KmPcim1o3Owvgyg72EaoG117ti=jFqG7RRjk=Svw@mail.gmail.com>
Subject: Re: [FlyRotary] Fuel Pump and Regulator
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Steve
Pretty sure the pumps have 20 amp fuse required stamped on them. they can
draw about 8-9 amp so 10 was just too close. you don't want to be changing
these in flight.
stick with the regulator you got. in practice you wont be using both pumps
unless one fails so the 10 psi increase wont happen in flight. the
regulator has to flow the most when the engine is stopped but pump on. I'd
doubt you'd see same increase at full rpm. A bigger regulator may not be a
total fix it either, would need large fuel lines also to flow 2 pumps worth
of fuel.
I think just a switch on the panel is fine for activating the pumps, a
pressure switch is just something else to fail. and you may not realise
you've got a bad pump. it would have to be setup to switch pumps and send
you an alert, all of which can be done manually without much stress.
cheers
Andrew


On Fri, Mar 17, 2017 at 5:44 PM, steve Izett <flyrotary@lancaironline.net>
wrote:

> Hi Guys
>
> I fired up my secondary fuel pump for  the first time today and was met
> with what I didn=E2=80=99t expect.
> Instead of seeing a blip in the fuel pressure, I had a 10psi increase and
> high current draw from the pump which blew its 10amp fuse.
> I=E2=80=99ll up the fuse as its too low me thinks.
>
> I used an old fuel regulator I had on a rail. It was of a Toyota 4AGE
> engine of about 135hp.
> Seems like its not able to bypass enough fuel with both pumps running.
>
> I think I need to install a higher power adjustable regulator.
> What experience do you guys have with turning both pumps on simultaneousl=
y?
>
> I=E2=80=99m putting a pressure switch in the circuit to turn on the backu=
p pump if
> the fuel pressure drops below a preset level.
>
> Appreciate your thoughts and experience.
>
> Steve Izett
> Genesis 4 port EC3 EM3 RD1C in a Glasair Super II RG still nearly finishe=
d!
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:
> 81/lists/flyrotary/List.html
>

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<div dir=3D"ltr"><div><div><div>Hi Steve<br></div>Pretty sure the pumps hav=
e 20 amp fuse required stamped on them. they can draw about 8-9 amp so 10 w=
as just too close. you don&#39;t want to be changing these in flight.<br></=
div>stick with the regulator you got. in practice you wont be using both pu=
mps unless one fails so the 10 psi increase wont happen in flight. the regu=
lator has to flow the most when the engine is stopped but pump on. I&#39;d =
doubt you&#39;d see same increase at full rpm. A bigger regulator may not b=
e a total fix it either, would need large fuel lines also to flow 2 pumps w=
orth of fuel.<br></div>I think just a switch on the panel is fine for activ=
ating the pumps, a pressure switch is just something else to fail. and you =
may not realise you&#39;ve got a bad pump. it would have to be setup to swi=
tch pumps and send you an alert, all of which can be done manually without =
much stress.<br><div><div class=3D"gmail_extra">cheers<br><div><div class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature">Andrew <br><br><br>=
</div></div>
<br><div class=3D"gmail_quote">On Fri, Mar 17, 2017 at 5:44 PM, steve Izett=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:flyrotary@lancaironline.net" targe=
t=3D"_blank">flyrotary@lancaironline.net</a>&gt;</span> wrote:<br><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex">Hi Guys<br>
<br>
I fired up my secondary fuel pump for=C2=A0 the first time today and was me=
t with what I didn=E2=80=99t expect.<br>
Instead of seeing a blip in the fuel pressure, I had a 10psi increase and h=
igh current draw from the pump which blew its 10amp fuse.<br>
I=E2=80=99ll up the fuse as its too low me thinks.<br>
<br>
I used an old fuel regulator I had on a rail. It was of a Toyota 4AGE engin=
e of about 135hp.<br>
Seems like its not able to bypass enough fuel with both pumps running.<br>
<br>
I think I need to install a higher power adjustable regulator.<br>
What experience do you guys have with turning both pumps on simultaneously?=
<br>
<br>
I=E2=80=99m putting a pressure switch in the circuit to turn on the backup =
pump if the fuel pressure drops below a preset level.<br>
<br>
Appreciate your thoughts and experience.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
Steve Izett<br>
Genesis 4 port EC3 EM3 RD1C in a Glasair Super II RG still nearly finished!=
<br>
--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
lists/flyrotary/List.html" rel=3D"noreferrer" target=3D"_blank">http://mail=
.lancaironline.net:<wbr>81/lists/flyrotary/List.html</a><br>
</font></span></blockquote></div><br></div></div></div>

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