From: "Steven W. Boese" <flyrotary@lancaironline.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Fuel Pump and Regulator
Thread-Topic: [FlyRotary] Fuel Pump and Regulator
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Date: Fri, 17 Mar 2017 17:34:53 +0000
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Steve,


I used a stock Mazda 1986 fuel pressure regulator, two NAPA 2P4028 fuel pum=
ps in parallel, and an Andair duplex fuel selector valve. The fuel lines ar=
e -6 (3/8") except that the fuel return to one of the tanks has an addition=
al 3 ft of -4 (1/4") aluminum tubing.  The fuel pumps each move 47 gal/hr a=
gainst a 7 psi head.


The fuel pressure in the rail is 38 psi when either pump is running.  The c=
urrent draw from either pump is 6 amps.


When both pumps are running, the fuel pressure in the rail is 39.1 psi when=
 the tank without the additional 1/4" return tubing is selected and 39.6 ps=
i when the tank with the additional 1/4" return tubing is selected.  The cu=
rrent draw from both pumps is 12 amps.


Since with my setup running both pumps only increases the pressure by about=
 1 psi, and the 3 ft of 1/4" tubing only adds about 0.5 psi of back pressur=
e with both pumps running, it might be worth checking for a restriction som=
ewhere in your system.


Steve Boese


________________________________
From: Rotary motors in aircraft <flyrotary@lancaironline.net> on behalf of =
steve Izett <flyrotary@lancaironline.net>
Sent: Friday, March 17, 2017 3:44:46 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Fuel Pump and Regulator

Hi Guys

I fired up my secondary fuel pump for  the first time today and was met wit=
h what I didn=92t expect.
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.
I=92ll 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 engin=
e 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 simultaneously?

I=92m putting a pressure switch in the circuit to turn on the backup pump i=
f 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 finished!
--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.=
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<p>Steve,</p>
<p><br>
</p>
<p>I used a stock Mazda 1986 fuel pressure regulator, two NAPA 2P4028 fuel =
pumps in parallel, and an Andair duplex fuel selector valve. The fuel lines=
 are -6 (3/8&quot;) except that the fuel return to one of the tanks has an =
additional 3 ft of -4 (1/4&quot;) aluminum
 tubing.&nbsp; The fuel pumps each move 47 gal/hr against a 7 psi head.</p>
<p><br>
</p>
<p>The fuel pressure in the rail is 38 psi when either pump is running.&nbs=
p; The current draw from either pump is 6 amps.</p>
<p><br>
</p>
<p>When both pumps are running, the fuel pressure in the rail is 39.1 psi w=
hen the tank without the additional 1/4&quot; return tubing is selected and=
 39.6 psi when the tank with the additional 1/4&quot; return tubing is sele=
cted.&nbsp; The current draw from both pumps is
 12 amps.</p>
<p><br>
</p>
<p>Since with my setup running both pumps only increases the pressure by ab=
out 1 psi, and the 3 ft of 1/4&quot; tubing only adds about 0.5 psi of back=
 pressure with both pumps running, it might be worth checking for a restric=
tion somewhere in your system.</p>
<p><br>
</p>
<p>Steve Boese</p>
<p><br>
</p>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"x_divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" =
color=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Rotary motors in ai=
rcraft &lt;flyrotary@lancaironline.net&gt; on behalf of steve Izett &lt;fly=
rotary@lancaironline.net&gt;<br>
<b>Sent:</b> Friday, March 17, 2017 3:44:46 AM<br>
<b>To:</b> Rotary motors in aircraft<br>
<b>Subject:</b> [FlyRotary] Fuel Pump and Regulator</font>
<div>&nbsp;</div>
</div>
</div>
<font size=3D"2"><span style=3D"font-size:10pt;">
<div class=3D"PlainText">Hi Guys<br>
<br>
I fired up my secondary fuel pump for&nbsp; the first time today and was me=
t with what I didn=92t 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=92ll 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=92m putting a pressure switch in the circuit to turn on the backup pump i=
f the fuel pressure drops below a preset level.<br>
<br>
Appreciate your thoughts and experience.<br>
<br>
Steve Izett<br>
Genesis 4 port EC3 EM3 RD1C in a Glasair Super II RG still nearly finished!=
<br>
--<br>
Homepage:&nbsp; <a href=3D"http://www.flyrotary.com/">http://www.flyrotary.=
com/</a><br>
Archive and UnSub:&nbsp;&nbsp; <a href=3D"http://mail.lancaironline.net:81/=
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http://mail.lancaironline.net:81/lists/flyrotary/List.html</a><br>
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