X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 09 Jul 2012 10:01:39 -0400 Message-ID: X-Original-Return-Path: Received: from nm10-vm0.bullet.mail.ne1.yahoo.com ([98.138.91.72] verified) by logan.com (CommuniGate Pro SMTP 5.4.6) with SMTP id 5642917 for lml@lancaironline.net; Sun, 08 Jul 2012 12:17:40 -0400 Received-SPF: neutral receiver=logan.com; client-ip=98.138.91.72; envelope-from=browncc1@verizon.net Received: from [98.138.90.57] by nm10.bullet.mail.ne1.yahoo.com with NNFMP; 08 Jul 2012 16:17:07 -0000 Received: from [68.142.200.227] by tm10.bullet.mail.ne1.yahoo.com with NNFMP; 08 Jul 2012 16:17:07 -0000 Received: from [66.94.237.100] by t8.bullet.mud.yahoo.com with NNFMP; 08 Jul 2012 16:17:07 -0000 Received: from [127.0.0.1] by omp1005.access.mail.mud.yahoo.com with NNFMP; 08 Jul 2012 16:17:07 -0000 X-Yahoo-Newman-Id: 63216.26960.bm@omp1005.access.mail.mud.yahoo.com Received: (qmail 89198 invoked from network); 8 Jul 2012 16:17:06 -0000 X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: EYxYEBQVM1le1xNmI17KzHRGO6AgrvVkmGpuzF2Q1xRBZ8a CTcgZXhnmS26r7naj3pKKS.X60_v8rYmWHAG8hfnMx1S5.3RICY8upVIruDC J82Wu3WHBm6504IO4JvroIBv3.lG1HhnOs5hYhQBduWTnpli7NIteJSoHkBJ v3UYoTluEuFqQb46Aj2YqDm3xdChuBUh94rSrWotIsi3FWuebIslGid6nlCf qvOw5XBxrFqLahKP_flt5zbwCosKqzjkJibXCHmYKMPXqvfbOq92phThineP WcM1IhWMG9yBBjadgkMiGh81j8d1Ut.XOwjBaIECeWWd2nYv6Zoq_mAK.Kll Fl9..koVZxxNWcIvlqqS9FT8hEIhnMxH8..otkaQOKV0I9Pu5yHqJIkXd3me PE_3J3uxuXbKDeSLOEupA2Of7whhxL8c0s2j0_WL.0XYnL9Ot5EMa0x0kI7I rk__VPfg1 X-Yahoo-SMTP: F49l9g6swBC0R9n8vJIbm7Tf3P8Xlmia8rHIwTlO__Ml Received: from chass-imac-2.home (browncc1@72.64.105.53 with plain) by smtp102.vzn.mail.bf1.yahoo.com with SMTP; 08 Jul 2012 09:17:06 -0700 PDT From: Charles Brown Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-19-532289449 Subject: Re: [LML] Fuel Pressure Problems X-Original-Date: Sun, 8 Jul 2012 11:17:05 -0500 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: X-Mailer: Apple Mail (2.1084) --Apple-Mail-19-532289449 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi Alan, Do I detect a Garmin 900 here? Mine (IO-550N, G900) sets off a warning = bell every time the fuel pressure goes below 8 psi -- it's a real = nuisance. =20 Your current situation sounds like my airplane has always behaved. At = 12000 ft, 2300 rpm, 25 LOP, WOT=3D18.8", I get 9.8gph and fuel pressure = below 8psi -- even if I turn on the boost pump. I can get stable fuel = flow without the boost pump in this condition, fuel press approximately = 7.5psi, so that's the way I fly. No adverse effects. Have done this in = straight, cruising flight in smooth or light chop conditions; haven't = tested maneuvers or heavy turbulence. At this flight condition when I have briefly leaned further than 25LOP, = the fuel flow has been unstable without the boost pump. Charley Brown Grand Prairie, TX Legacy #299 N550KC 130 hr On Jul 5, 2012, at 2:44 PM, Alan Crawford wrote: Just started having a change in fuel pressure at cruise. I have a = Legacy ... 550N ... been cruising 40 to 60 degrees lean of peak with no = problem, with fuel pressure above 8.2 psi. Depending on altitude 2500 = rpm - 2300 rpm ... 11.5 to 11.8 gph ... =20 The last few flights I can not get 40 degrees lean of peak at any = altitude without the fuel pressure dropping below 8.0 psi ... even if I = turn on the fuel pump to low =3D 9, 500 - 11,500 - 12,500 ???? =20 any ideas on what is going on???? Takeoff fuel pressure is 28.0 psi .... = =20 =20 Thanks ...=20 Alan Crawford Lake Buchanan, Texas Lancair Legacy=20 =20 =20 Life is NOT a journey to the grave with the intention of arriving safely in a pretty and well preserved body, BUT rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming, "WOW, WHAT A RIDE!!!" --Apple-Mail-19-532289449 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii

At this flight = condition when I have briefly leaned further than 25LOP, the fuel flow = has been unstable without the boost = pump.

Charley Brown
Grand Prairie, = TX
Legacy #299  N550KC   130 = hr


On Jul 5, 2012, at 2:44 PM, Alan = Crawford wrote:

Just started having a change = in fuel=20 pressure at cruise.  I have a Legacy ... 550N ... been cruising 40 = to 60=20 degrees lean of peak with no problem, with fuel pressure above 8.2 psi.=20= Depending on altitude 2500 rpm - 2300 rpm ... 11.5 to 11.8 gph ... =
 
The last few flights I can = not get 40=20 degrees lean of peak at any altitude without the fuel pressure dropping = below=20 8.0 psi ... even if I turn on the fuel pump to low =3D 9, 500 - = 11,500 -=20 12,500 ????
 
any ideas on what is = going on????=20 Takeoff fuel pressure is 28.0 psi ....  
 
Thanks ... 
Alan Crawford
Lake Buchanan, Texas =
Lancair = Legacy 
 
 
Life is NOT a journey to the = grave with the=20 intention of arriving safely
  in a pretty and well preserved = body, BUT=20 rather to skid in=20 = broadside,
          = =20 thoroughly used up, totally worn out, and=20 = proclaiming,
         &nbs= p;            =      =20 "WOW, WHAT A RIDE!!!"

= --Apple-Mail-19-532289449--