X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qmta06.emeryville.ca.mail.comcast.net ([76.96.30.56] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5598213 for flyrotary@lancaironline.net; Wed, 13 Jun 2012 18:43:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.56; envelope-from=hoursaway1@comcast.net Received: from omta05.emeryville.ca.mail.comcast.net ([76.96.30.43]) by qmta06.emeryville.ca.mail.comcast.net with comcast id MycB1j0020vp7WLA6yjAsz; Wed, 13 Jun 2012 22:43:10 +0000 Received: from sz0081.ev.mail.comcast.net ([76.96.26.137]) by omta05.emeryville.ca.mail.comcast.net with comcast id MyjA1j0072xV6SL8RyjApf; Wed, 13 Jun 2012 22:43:10 +0000 Date: Wed, 13 Jun 2012 22:43:09 +0000 (UTC) From: hoursaway1@comcast.net To: Rotary motors in aircraft Message-ID: <544134821.81991.1339627389877.JavaMail.root@sz0081a.emeryville.ca.mail.comcast.net> In-Reply-To: Subject: Re: [FlyRotary] Re: Fuel presure question. MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_81990_1038572691.1339627389877" X-Originating-IP: [71.206.108.115] X-Mailer: Zimbra 6.0.13_GA_2944 (ZimbraWebClient - IE8 (Win)/6.0.13_GA_2944) ------=_Part_81990_1038572691.1339627389877 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Fuel is gravity routed from tanks to ganged fuel selector out to T-fitting = with each pump on the sides of the T,=C2=A0 to another T,=C2=A0 into main l= ine out to eng., pressure=C2=A0sender is mounted directly after the T=C2=A0= where the two pumps come together.=C2=A0=C2=A0 All this is in front of the= wing spar near the floor in an RV6A. This would make the pumps in parallel= & the pressure is the same from either pump, but both together pressure dr= ops.=C2=A0=C2=A0 David=C2=A0=20 ----- Original Message ----- From: "Mark Steitle" msteitle@gmail.com=20 To: "Rotary motors in aircraft" =20 Sent: Wednesday, June 13, 2012 8:36:19 AM=20 Subject: [FlyRotary] Re: Fuel presure question.=20 David,=20 How are your pumps plumbed... in parallel or series? =C2=A0What kind of=20 pressure do you get when running the backup pump only?=20 Mark=20 On 6/13/12, Tracy wrote:=20 > Hmmmm... =C2=A0Mine goes up about a pound when I switch on the second pum= p. =C2=A0What=20 > happens when you turn both off?=20 >=20 > Tracy=20 >=20 > Sent from my iPad=20 >=20 > On Jun 12, 2012, at 7:11 PM, hoursaway1@comcast.net wrote:=20 >=20 >> Question about fuel pressure indications, at fast idle 2200 RPM, fuel=20 >> pressure is 42 PSI on EM2, if I switch on the back-up pump with the=20 >> primary pump the pressure drops to 35 PSI, can here both pumps running, = if=20 >> I switch off either pump pressure goes back to 42 PSI. =C2=A0My system i= s 13B,=20 >> stock red injectors all four, pressure regulator is stock Mazda on the e= nd=20 >> of fuel rail with vacume connection from dynamic chamber. =C2=A0Thanks, = =C2=A0David=20 >> R. Cook =C2=A0RV6A Rotary.=20 >=20 --=20 Homepage: =C2=A0http://www.flyrotary.com/=20 Archive and UnSub: =C2=A0 http://mail.lancaironline.net:81/lists/flyrotary/= List.html=20 ------=_Part_81990_1038572691.1339627389877 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <= div style=3D'font-family: Arial; font-size: 12pt; color: #000000'>Fuel is g= ravity routed from tanks to ganged fuel selector out to T-fitting with each= pump on the sides of the T, to another T, into main line out t= o eng., pressure sender is mounted directly after the T where th= e two pumps come together. All this is in front of the wing spa= r near the floor in an RV6A. This would make the pumps in parallel & th= e pressure is the same from either pump, but both together pressure drops.&= nbsp; David

From: "Mark Steitle" msteitle@= gmail.com
To: "Rotary motors in aircraft" <flyrotary@lanca= ironline.net>
Sent: Wednesday, June 13, 2012 8:36:19 AM
= Subject: [FlyRotary] Re: Fuel presure question.

David,

Ho= w are your pumps plumbed... in parallel or series? What kind of
pr= essure do you get when running the backup pump only?

Mark

On = 6/13/12, Tracy <rwstracy@gmail.com> wrote:
> Hmmmm... Min= e goes up about a pound when I switch on the second pump. What
>= ; happens when you turn both off?
>
> Tracy
>
> Sen= t from my iPad
>
> On Jun 12, 2012, at 7:11 PM, hoursaway1@comc= ast.net wrote:
>
>> Question about fuel pressure indications= , at fast idle 2200 RPM, fuel
>> pressure is 42 PSI on EM2, if I s= witch on the back-up pump with the
>> primary pump the pressure dr= ops to 35 PSI, can here both pumps running, if
>> I switch off eit= her pump pressure goes back to 42 PSI. My system is 13B,
>> = stock red injectors all four, pressure regulator is stock Mazda on the end<= BR>>> of fuel rail with vacume connection from dynamic chamber. = ;Thanks, David
>> R. Cook RV6A Rotary.
>

= --
Homepage: http://www.flyrotary.com/
Archive and UnSub: = ; http://mail.lancaironline.net:81/lists/flyrotary/List.html
------=_Part_81990_1038572691.1339627389877--