X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rv-out-0506.google.com ([209.85.198.232] verified) by logan.com (CommuniGate Pro SMTP 5.2.6) with ESMTP id 3069210 for flyrotary@lancaironline.net; Sat, 09 Aug 2008 19:58:06 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.198.232; envelope-from=rwstracy@gmail.com Received: by rv-out-0506.google.com with SMTP id f6so1444199rvb.7 for ; Sat, 09 Aug 2008 16:57:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:sender :to:subject:in-reply-to:mime-version:content-type:references :x-google-sender-auth; bh=+QxyeThL1USUrEgkzjolYQnqfzr+l0PEZoNjWHS8GQA=; b=MJocTsJBLMn2w9d42ek3SmhnmLm1NngxB7XsUUp/XGUOxCNON9W7hgFmkZ8N00y0vV b9LYgN/y+ekrwZ3a0oM5KuMOUseyiMcSygbismH5nsWigiuY6LmSFoHsJPYNM6UrWfOi oLUqV5XKIYaZGmKO4Yz3+9bCn1CmRK0sy6aF0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:in-reply-to:mime-version :content-type:references:x-google-sender-auth; b=h6pE7bHGMqruRZFgl2OSBbBBzkY0PDeWQgu1SdBZEZ4uRynMz0TmES9Tkx2ADmdzmM JoryJ+h7q3pWdXw/EwPudsgqn/wuNDtSBrKEFi82Nh6RiSwd/X5DC2CJS3EX+CUWGKjT JDIVKZMSp/a6H+CAYTxahOyI1gVXUDW4lSjvQ= Received: by 10.141.177.10 with SMTP id e10mr2436823rvp.72.1218326248116; Sat, 09 Aug 2008 16:57:28 -0700 (PDT) Received: by 10.141.41.18 with HTTP; Sat, 9 Aug 2008 16:57:28 -0700 (PDT) Message-ID: <1b4b137c0808091657n6e66f905he1726f3c121c1c8b@mail.gmail.com> Date: Sat, 9 Aug 2008 19:57:28 -0400 From: "Tracy Crook" Sender: rwstracy@gmail.com To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Fuel pressure In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_49970_7552576.1218326248108" References: X-Google-Sender-Auth: 3a18bcee2aa80ffe ------=_Part_49970_7552576.1218326248108 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline I am seeing some similar indications on fuel pressure (going higher) myself but not a change in mixture. I looked at the sensor offset in EM2 after landing (and relieving the pressure in fuel system) and it looks like the sensor is drifting around. = I reset the sensor offset and things went back to normal for awhile. VDO now has a warning on their senders to not use them on anything but oil. Don't know if this has anything to do with it or not. My sender is about 6 years old. Tracy On Sat, Aug 9, 2008 at 3:32 PM, Al Gietzen wrote: > Somewhere during my trip a few weeks ago, I had noted that the engine > seemes to be running a bit rich from where I had set it. I then noted th= at > the fuel pressure was reading high =96 like about 48 -49 psi; and I have = the > regulator set for 40 psi at WOT. Not know what else to try, I switched fr= om > pump 1 to pump 2. After a bit the pressure was back to normal; and worked > fine after that. > > > > My thought later was that switching the pumps should have nothing to do > with it. The two pumps are in parallel, then the filter, then the pressu= re > sensor, then the fuel rail with the regulator on the end, bypassing back = to > the tank. > > > > Last week on a short flight I noted the fuel pressure bar on the EM2 at t= he > max and blinking. The readout was 50 psi. I watched for a short while > nothing changed; then switched pumps. Nothing changed right away, but th= e > pressure slowly returned to normal. Then running pump1, both pumps, or pu= mp > 2 didn't make any difference. > > > > I discussed with the expert at TWM (the maker of the pressure regulator) > and after some discussion, he was completely at a loss as to what could > cause the pressure regulator to act in that fashion. It is a MAP referen= ced > regulator, and the MAP readout was as it should be. > > > > I'm baffled. > > > > Al > ------=_Part_49970_7552576.1218326248108 Content-Type: text/html; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
I am seeing some similar indications on fuel pressure= (going higher) myself but not a change in mixture.
 
I looked at the sensor offset in EM2 after landing (and relieving the = pressure in fuel system) and it looks like the sensor is drifting around.&n= bsp; I reset the sensor offset and things went back to normal for awhile. <= /div>
 
VDO now has a warning on their senders to not use them on anything but= oil.  Don't know if this has anything to do with it or not. = My sender is about 6 years old.
 
Tracy

On Sat, Aug 9, 2008 at 3:32 PM, Al Gietzen <ALVentures@cox.net> wrote:

Somewhere during my trip a few weeks ago, I had noted that = the engine seemes to be running a bit rich from where I had set it.  I= then noted that the fuel pressure was reading high =96 like about 48 -49 p= si; and I have the regulator set for 40 psi at WOT. Not know what else to t= ry, I switched from pump 1 to pump 2. After a bit the pressure was back to = normal; and worked fine after that.

 

My thought later was that switching the pumps should have n= othing to do with it.  The two pumps are in parallel, then the filter,= then the pressure sensor, then the fuel rail with the regulator on the end= , bypassing back to the tank.

 

Last week on a short flight I noted the fuel pressure bar o= n the EM2 at the max and blinking. The readout was 50 psi. I watched for a = short while nothing changed; then switched pumps.  Nothing changed rig= ht away, but the pressure slowly returned to normal. Then running pump1, bo= th pumps, or pump 2 didn't make any difference.

 

I discussed with the expert at TWM (the maker of the pressu= re regulator) and after some discussion, he was completely at a loss as to = what could cause the pressure regulator to act in that fashion.  It is= a MAP referenced regulator, and the MAP readout was as it should be.

 

I'm baffled.

 

Al

<= br>
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