X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 21 Jul 2009 08:18:14 -0400 Message-ID: X-Original-Return-Path: Received: from smtp128.sbc.mail.sp1.yahoo.com ([69.147.65.187] verified) by logan.com (CommuniGate Pro SMTP 5.2.15) with SMTP id 3765892 for lml@lancaironline.net; Mon, 20 Jul 2009 12:38:50 -0400 Received-SPF: none receiver=logan.com; client-ip=69.147.65.187; envelope-from=pbricker@att.net Received: (qmail 84544 invoked from network); 20 Jul 2009 16:38:15 -0000 Received: from unknown (HELO paulrzm5oth3zt) (pbricker@76.206.248.200 with login) by smtp128.sbc.mail.sp1.yahoo.com with SMTP; 20 Jul 2009 16:38:15 -0000 X-YMail-OSG: WuK4zGUVM1n45q3KcjDX9fYAsY1uzTBAecrce3iHMF8JTtPT6MLkQ1yrinElo43qAzmTPmeB56Ou3Ue2kVRSdEVICV3Lt9s_bq4V1UsTJ3mFFNiDjx_aSSOEGe5RkMZNnFoDp9HpD5XAAPtD4NCEoZppwm_Y5oJ2yrGyCmbOSwZ89VKCQ6p8X2h91mTX06wb6OosU_h3tEs5kevS4I66EVo3pFvNcFnHzjOk5a02G.RpUHLGSn9wjkijN0HTic982yXxO32TDR2LhtEi0t6xrGAbq.u9949ThGXHzSW2ZqfsinqVlOumkX_Pvu4_ X-Yahoo-Newman-Property: ymail-3 From: "Paul Bricker" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Fuel flow issue X-Original-Date: Mon, 20 Jul 2009 09:38:18 -0700 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A2_01CA091D.D08D1950" X-Mailer: Microsoft Office Outlook 11 In-Reply-To: Thread-Index: AcoI4pdyuijXAJWbR/aoh+fcTzjHEAAdK3Pw X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_00A2_01CA091D.D08D1950 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Scott, You didn=92t say what model you are flying , or the altitude of your = airport, but your fuel flow, even when =93up=94 are still very low for an IO-550. = I fly an ES with a IO-550-N, and FF less than 27 gph on takeoff roll is an = abort item. Cont says the FF should be between about 28 and 30 gph (about, I = don=92t have the manual here) at sea level at 2700 RPM. =20 Another concern I would have is the routing of the fuel lines from the = tanks to the selector, and then electric fuel pump location. Many of the ES = guys went to =BD inch fuel lines, and took great care to route the lines = without sharp corners and without 90 deg elbows on the way to the selector. We = also mounted the electric pump as low as possible, with some people laying it = on the side. On the suction side it easy to starve the pump, particularly = the engine drive one. =20 Paul Bricker N63PB =20 _____ =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Scott Keighan Sent: Sunday, July 19, 2009 7:34 PM To: lml@lancaironline.net Subject: [LML] Fuel flow issue =20 I have a question. Today while flying my first take off was normal. The second take off my fuel flow on takeoff went up to 19.0gph then back down to 12.2 after rotation then slowly went back to normal. Cruised around ok for 15 min then back to = the airport for a couple of circuits. No electric boost pump except I turned it on = for landing.=20 Next take off the same thing but max Flow on take off was 18.5gph for = half a second then it went back down to 14.5. Turn on the electric boost and within 2 = seconds its back up to 20.5gph. Landed and on a back track for another circuit the engine stalled. Restarted right away with no issues. Next circuit same issue. Up to 18.0gph then down to 15.0 = while rolling down the runway, hit the boost pump and within 2 seconds all is well. On downwind switch the boost pump off and the fuel flow stays in normal ranges. Take off left = or right tank, same issue. Fuel 25 gal in each tank.=20 =20 Fuel pressure stays normal the whole time. I checked for water in the = tanks and gascolator. I checked underneath the cowl for anything out of place. =20 Engine fuel pump rebuild required?? What do you think?? Any advise would be appreciated.=20 =20 Thanks Scott K IO-550-G =20 ------=_NextPart_000_00A2_01CA091D.D08D1950 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Scott,

You didn’t say what model you = are flying , or the altitude of your airport, but your fuel flow, even when = “up” are still very low for an IO-550. I fly an ES with a IO-550-N, and FF = less than 27 gph on takeoff roll is an abort item. Cont says the FF should be = between about 28 and 30 gph (about, I don’t have the manual here) at sea level = at 2700 RPM.

 

Another concern I would have is the routing of the fuel lines from the tanks to the selector, and then = electric fuel pump location. Many of the ES guys went to =BD inch fuel lines, and = took great care to route the lines without sharp corners and without 90 deg = elbows on the way to the selector. We also mounted the electric pump as low as possible, with some people laying it on the side. On the suction side it = easy to starve the pump, particularly the engine drive = one.

 

Paul = Bricker

N63PB

 

From: = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Scott Keighan
Sent: Sunday, July 19, = 2009 7:34 PM
To: = lml@lancaironline.net
Subject: [LML] Fuel flow = issue

 

I have a question.

Today while flying my first take off was = normal.  The second take off my fuel flow

on takeoff went up to 19.0gph then back down to = 12.2 after rotation then

slowly went back to normal.  Cruised around ok = for 15 min then back to the airport

for a couple of circuits.  No electric boost = pump except I turned it on for landing. 

Next take off the same thing but max Flow on = take off was 18.5gph for half a second then

it went back down to 14.5.  Turn on the electric = boost and within 2 seconds its back up to 20.5gph.

Landed and on a back track for another circuit the = engine stalled.  Restarted right away with

no issues.  Next circuit same issue.  Up to 18.0gph then down to 15.0 while rolling = down

the runway, hit the boost pump and within 2 seconds = all is well.  On downwind switch the

boost pump off and the fuel flow stays in normal ranges.  Take off left or right tank, same = issue.

Fuel 25 gal in each tank. =

 

Fuel pressure stays normal the whole time.  = I checked for water in the tanks and = gascolator.

I checked underneath the cowl for anything out of = place.

 

Engine fuel pump rebuild required??  What do you think??

Any advise would be appreciated. =

 

Thanks

Scott K

IO-550-G  

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