X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 09 Dec 2010 07:58:44 -0500 Message-ID: X-Original-Return-Path: Received: from mail-ey0-f178.google.com ([209.85.215.178] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTP id 4634576 for lml@lancaironline.net; Wed, 08 Dec 2010 20:30:35 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.215.178; envelope-from=doberme@gmail.com Received: by eyh5 with SMTP id 5so1232202eyh.9 for ; Wed, 08 Dec 2010 17:30:00 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=D4hlK1+x9sKxbb6K2OJhu/wMJ/fLYEeGex/MoTA/27EVyJEhg3rDovrQzmmZ0+R8kv SZyacWa5nJHqvT2Ehepalye3oNliAwUvokvq1boRyGUs0k7fvN6YubK0uIdJKfaed59w 66WTo5D8q8cGuWn8w5BCgTC8c4okmLeBDpzOU= MIME-Version: 1.0 Received: by 10.213.35.68 with SMTP id o4mr4691640ebd.75.1291858199947; Wed, 08 Dec 2010 17:29:59 -0800 (PST) Received: by 10.213.27.200 with HTTP; Wed, 8 Dec 2010 17:29:59 -0800 (PST) In-Reply-To: References: X-Original-Date: Wed, 8 Dec 2010 19:29:59 -0600 X-Original-Message-ID: Subject: Re: [LML] Re: Lancair 320 (Carb) Fuel Pressure question From: Marvin Doberenz X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=0015174c0c721baab40496f02d37 --0015174c0c721baab40496f02d37 Content-Type: text/plain; charset=ISO-8859-1 Matt, I had low pressure only when I was on the left tank. Numerous checks yielded nothing. Finally it did the same thing while on the right tank. I would actually have low pressure to the point of the engine missing. Yet after switching tanks and adding the boost pump, rechecks would be normal! It was just coincidence. It finally did it on the right tank. I replaced the pump and the problem is gone. I hate intermittent problems! Good luck on yours. Marvin Doberenz N425A On Tue, Dec 7, 2010 at 1:39 PM, wrote: > 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 > > --0015174c0c721baab40496f02d37 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Matt,
=A0
I had low pressure only when I was on the left tank.=A0 Numerous check= s yielded nothing.=A0 Finally it did the same thing while on the right tank= .=A0 I would actually have low pressure to the point of the engine missing.= =A0 Yet after switching tanks and adding the boost pump, rechecks would be = normal!=A0 It was just coincidence.=A0 It finally did it on the right tank.= =A0 I replaced the pump and the problem is gone.=A0 I hate intermittent pro= blems!=A0 Good luck on yours.
=A0
Marvin Doberenz
N425A

On Tue, Dec 7, 2010 at 1:39 PM, <Sky2high@aol.com> w= rote:
Matt,
=A0
It is possible that the sender/computer wire connections are failing.= =A0 The zero reading could be a loss of ground, power, or sender data conne= ctions.=A0 Consider this:
=A0
The pump=A0teed sensor location is subject to vibration and that could= affect the sensor,=A0 fatiguing=A0non-steel fittings or electrical connect= ions.=A0 In this case, the wires/connectors should be supported to the sens= or so that the vibration is in synch with the sensor.
=A0
A remote mounted sensor not subject to vibration=A0is fine as long as = there is a flow=A0restrictor=A0before the takeoff line so the fuel sprayed = in the engine compartment is minimized should the line or sensor become dis= connected.=A0=A0
=A0
Check the wire and=A0connectors.
=A0
Scott Krueger=A0=A0
=A0
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.=A0
=A0
My engine has the fuel pressure sender mounted ON the mechanical fuel = pump itself.=A0 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.=A0=A0 There are no problems with the engine running and it stil= l happily burns about 7 gallons per hour.=A0=A0 I replaced my fuel pressure= sender because I thought with the vibrations of the engine, it could have = went on the fritz=A0but nothing changed.=A0 My brother's RV-7A fuel pre= ssure sender is located on his firewall with a hose running to it which I l= ike better.
=A0
I am wondering 2 things.=A0
=A0
First, since this is a change from what is "normal", I am wo= ndering if my mechanical fuel pump is needing CPR.=A0 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.
=A0
And second, I am wondering where the fuel pressure sender=A0SHOULD be = located and exactly where on the engine it connects to - the carb itself or= the mechanical fuel pump itself.=A0 I do have the overflow tube coming out= of the mechanical fuel pump and have not noticed any liquids or engine run= ning issues.=A0
=A0
Winter in Lake Effect Snowland of Rochester, NY provides a great time = to work on airplanes.
=A0
Sure appreciate your input.
=A0
Matt Reeves
N320KR


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