X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 07 Dec 2010 14:39:26 -0500 Message-ID: X-Original-Return-Path: Received: from imr-db01.mx.aol.com ([205.188.91.95] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTP id 4632326 for lml@lancaironline.net; Tue, 07 Dec 2010 10:14:27 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.91.95; envelope-from=Sky2high@aol.com Received: from imo-da03.mx.aol.com (imo-da03.mx.aol.com [205.188.169.201]) by imr-db01.mx.aol.com (8.14.1/8.14.1) with ESMTP id oB7FDjtg011852 for ; Tue, 7 Dec 2010 10:13:45 -0500 Received: from Sky2high@aol.com by imo-da03.mx.aol.com (mail_out_v42.9.) id q.d87.103c9b82 (43895) for ; Tue, 7 Dec 2010 10:13:34 -0500 (EST) Received: from magic-d19.mail.aol.com (magic-d19.mail.aol.com [172.19.155.135]) by cia-dc05.mx.aol.com (v129.7) with ESMTP id MAILCIADC058-ab774cfe4f1e210; Tue, 07 Dec 2010 10:13:34 -0500 From: Sky2high@aol.com X-Original-Message-ID: <5a674.28cfb4b8.3a2fa91e@aol.com> X-Original-Date: Tue, 7 Dec 2010 10:13:34 EST Subject: Re: [LML] Lancair 320 (Carb) Fuel Pressure question X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_5a674.28cfb4b8.3a2fa91e_boundary" X-Mailer: AOL 9.5 sub 5400 X-AOL-IP: 24.15.17.119 X-Spam-Flag:NO X-AOL-SENDER: Sky2high@aol.com --part1_5a674.28cfb4b8.3a2fa91e_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Matt, It is possible that the sender/computer wire connections are failing. The zero reading could be a loss of ground, power, or sender data connections. Consider this: The pump teed sensor location is subject to vibration and that could affect the sensor, fatiguing non-steel fittings or electrical connections. In this case, the wires/connectors should be supported to the sensor so that the vibration is in synch with the sensor. A remote mounted sensor not subject to vibration is fine as long as there is a flow restrictor before the takeoff line so the fuel sprayed in the engine compartment is minimized should the line or sensor become disconnected. Check the wire and connectors. Scott Krueger In a message dated 12/7/2010 6:42:51 A.M. Central Standard Time, mattreeves@yahoo.com writes: I have a Lancair 320 with a Lycoming 0-320-D3G engine. My engine has the fuel pressure sender mounted ON the mechanical fuel pump itself. I have noticed that lately my fuel pressure is possessed by the devil and runs from zero to 6 psi whenever it wants, in flight and on the ground. There are no problems with the engine running and it still happily burns about 7 gallons per hour. I replaced my fuel pressure sender because I thought with the vibrations of the engine, it could have went on the fritz but nothing changed. My brother's RV-7A fuel pressure sender is located on his firewall with a hose running to it which I like better. I am wondering 2 things. First, since this is a change from what is "normal", I am wondering if my mechanical fuel pump is needing CPR. I know they no longer sell rebuild kits due to liability so to replace the pump is only $378 at Aircraft Spruce, not a big deal. And second, I am wondering where the fuel pressure sender SHOULD be located and exactly where on the engine it connects to - the carb itself or the mechanical fuel pump itself. I do have the overflow tube coming out of the mechanical fuel pump and have not noticed any liquids or engine running issues. Winter in Lake Effect Snowland of Rochester, NY provides a great time to work on airplanes. Sure appreciate your input. Matt Reeves N320KR --part1_5a674.28cfb4b8.3a2fa91e_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Matt,

It is possible that the sender/computer wire connections are failing.= =20 The zero reading could be a loss of ground, power, or sender data=20 connections. Consider this:

The pump teed sensor location is subject to vibration and that= could=20 affect the sensor, fatiguing non-steel fittings or electrical= =20 connections. In this case, the wires/connectors should be supported= to the=20 sensor so that the vibration is in synch with the sensor.

A remote mounted sensor not subject to vibration is fine as long= as=20 there is a flow restrictor before the takeoff line so the fuel= sprayed=20 in the engine compartment is minimized should the line or sensor become=20 disconnected.

Check the wire and connectors.

Scott Krueger

In a message dated 12/7/2010 6:42:51 A.M. Central Standard Time,=20 mattreeves@yahoo.com writes:

I have a Lancair 320 with a Lycoming 0-320-D3G engine. =

My engine has the fuel pressure sender mounted ON the mechani= cal=20 fuel pump itself. I have noticed that lately my fuel pressur= e is=20 possessed by the devil and runs from zero to 6 psi whenever it wan= ts, in=20 flight and on the ground. There are no problems with= the=20 engine running and it still happily burns about 7 gallons per=20 hour. I replaced my fuel pressure sender because I tho= ught=20 with the vibrations of the engine, it could have went on the=20 fritz but nothing changed. My brother's RV-7A fuel pres= sure=20 sender is located on his firewall with a hose running to it which= I like=20 better.

I am wondering 2 things.

First, since this is a change from what is "normal", I am won= dering=20 if my mechanical fuel pump is needing CPR. I know they no lo= nger=20 sell rebuild kits due to liability so to replace the pump is only= $378=20 at Aircraft Spruce, not a big deal.

And second, I am wondering where the fuel pressure=20 sender SHOULD be located and exactly where on the engine it= =20 connects to - the carb itself or the mechanical fuel pump itself.&= nbsp;=20 I do have the overflow tube coming out of the mechanical fuel pump= and=20 have not noticed any liquids or engine running issues.

Winter in Lake Effect Snowland of Rochester, NY provides a gr= eat=20 time to work on airplanes.

Sure appreciate your input.

Matt Reeves

N320KR

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