X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 921589 for flyrotary@lancaironline.net; Sun, 01 May 2005 18:48:16 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.71; envelope-from=sqpilot@bellsouth.net Received: from paul ([209.214.45.152]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with SMTP id <20050501224729.OKVV2467.imf23aec.mail.bellsouth.net@paul> for ; Sun, 1 May 2005 18:47:29 -0400 Message-ID: <000701c54f25$e6cee470$982dd6d1@paul> From: To: "fly rotary" Subject: fuel pumps Date: Mon, 2 May 2005 09:47:44 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C54EFB.FD2A8FF0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0004_01C54EFB.FD2A8FF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi all....I need to ask a question regarding the two EFI fuel pumps. (I = have two MSD pumps, I think they are something like 65 psi each). = Should these pumps run continuously? I know that on my automobile, when = you first turn the key (ignition), you can hear the fuel pump run for a = few seconds to pressurize the system, then it sounds like it shuts off. = On our aircraft, should they also do this or should they run = continuously, since the unused fuel is returned to the sump tank after = the fuel pressure regulator? I know that my MicroTech system has the = wire that supplies power to the fuel pumps going to a relay first, then = the power leaves the fuel pump relay and goes to the fuel pumps.=20 I know that most of you have Tracy's ECU system, but if I recall = correctly, I think that Ed Anderson had used an automotive ECU (another = brand) prior to changing to Tracy's ECU. Just wondering how that system = worked, regarding the fuel pumps.....constantly running or on demand. Thanks in advance for any and all info you guys might have = regarding how the EFI pumps are supposed to work. Paul Conner ------=_NextPart_000_0004_01C54EFB.FD2A8FF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi all....I need to ask a question = regarding the=20 two EFI fuel pumps. (I have two MSD pumps, I think they are something = like 65=20 psi each). Should these pumps run continuously? I know that = on my=20 automobile, when you first turn the key (ignition), you can hear the = fuel pump=20 run for a few seconds to pressurize the system, then it sounds like it = shuts=20 off. On our aircraft, should they also do this or should they run = continuously,=20 since the unused fuel is returned to the sump tank after the fuel = pressure=20 regulator? I know that my MicroTech system has the wire that = supplies=20 power to the fuel pumps going to a relay first, then the power leaves = the fuel=20 pump relay and goes to the fuel pumps.

I know that = most of you=20 have Tracy's ECU system, but if I recall correctly, I think that Ed = Anderson had=20 used an automotive ECU (another brand) prior to changing to Tracy's = ECU. =20 Just wondering how that system worked, regarding the fuel = pumps.....constantly=20 running or on demand.

Thanks in = advance for any=20 and all info you guys might have regarding how the EFI pumps are = supposed to=20 work. Paul Conner

------=_NextPart_000_0004_01C54EFB.FD2A8FF0--