X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 09 Jul 2012 10:01:40 -0400 Message-ID: X-Original-Return-Path: Received: from imr-da03.mx.aol.com ([205.188.105.145] verified) by logan.com (CommuniGate Pro SMTP 5.4.6) with ESMTP id 5642236 for lml@lancaironline.net; Sat, 07 Jul 2012 16:51:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.145; envelope-from=Sky2high@aol.com Received: from mtaomg-db05.r1000.mx.aol.com (mtaomg-db05.r1000.mx.aol.com [172.29.51.203]) by imr-da03.mx.aol.com (8.14.1/8.14.1) with ESMTP id q67Kp2QC008457 for ; Sat, 7 Jul 2012 16:51:02 -0400 Received: from core-mtb003b.r1000.mail.aol.com (core-mtb003.r1000.mail.aol.com [172.29.234.201]) by mtaomg-db05.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 8FB32E00008A for ; Sat, 7 Jul 2012 16:51:02 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <23772.4fd9c04a.3d29fb36@aol.com> X-Original-Date: Sat, 7 Jul 2012 16:51:02 -0400 (EDT) Subject: Re: [LML] Re: Fuel Pressure Problems X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_23772.4fd9c04a.3d29fb36_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [67.175.156.123] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:439326528:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d33cb4ff8a1360ec7 --part1_23772.4fd9c04a.3d29fb36_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Alan, Where is the fuel pressure sensor located in the fuel supply system? Grayhawk PS in most modern injected systems with a fuel flow sensor located just before the spider, the fuel pressure sensor should be teed in just after the engine fuel pump. Even Continental systems that have the throttle body return excess fuel usually maintain a rather steady pressure up to the throttle body. If pressure is measured after the throttle body, then it is related to fuel flow and was archaically used to provide an indication of flow before flow sensors became popular. Another possibility is that the lean lean fuel flow is so low that vaporization is occurring near the fuel pressure sensor because of heat. In a message dated 7/7/2012 3:17:40 P.M. Central Daylight Time, alan@tstar.net writes: Bob ... Reference: "How about a blockage in the fuel system?" The engine runs great at WOT in the climb ... the only problem is when I lean past the last cylinder peaking ... the low pressure warning bell goes off!!! I do not think it is a blockage problem??? No trash was noted in the fuel filter screen????? Paul ....."So, where is the transducer for pressure and what are the flows at takeoff and cruise and did they change? And, from experience, check the cowling and other areas for blue staining and flag any aroma of avgas in the cockpit as a show stopper." There is NO change in takeoff and cruise pressure / fuel flow - until I go lean of lean! There is no indication of any fuel leaking what so ever??? I am planning on cranking up the fuel pressure on the fuel pump and see if this will make any difference???? It could be an indicator problem I guess??? Will see if I can get closer to 32 psi at takeoff power and if so if I can still get below 40 LOP??? Thanks for the inputs ... Blue Skies ... Alan 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!!!" --part1_23772.4fd9c04a.3d29fb36_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Alan,

Where is the fuel pressure sensor located in the fuel supply system?

Grayhawk

PS in most modern injected systems with a fuel flow sensor locate= d=20 just before the spider, the fuel pressure sensor should be teed in just aft= er=20 the engine fuel pump. Even Continental systems that have the throttle= body=20 return excess fuel usually maintain a rather steady pressure up to the= =20 throttle body. If pressure is measured after the throttle body, then = it is=20 related to fuel flow and was archaically used to provide an indication= of=20 flow before flow sensors became popular. Another possibility is= that=20 the lean lean fuel flow is so low that vaporization is occurring near the f= uel=20 pressure sensor because of heat.

In a message dated 7/7/2012 3:17:40 P.M. Central Daylight Time,=20 alan@tstar.net writes:

=

Bob ... Reference: "= How about=20 a blockage in the fuel system?"

&nbs= p; &= nbsp; =20 The engine runs great at WOT in the climb ... the only problem is when I = lean=20 past the last cylinder

&nbs= p; &= nbsp; =20 peaking ... the low pressure warning bell goes off!!! I do not think it i= s a=20 blockage problem??? No

&nbs= p; &= nbsp; =20 trash was noted in the fuel filter screen?????

Paul ....."So, where is th= e=20 transducer for pressure and what are the flows at takeoff and cruise and = did=20 they change? And, from experience, check the cowling and other areas= for=20 blue staining and flag any aroma of avgas in the cockpit as a show=20 stopper."

&nbs= p; &= nbsp; There=20 is NO change in takeoff and cruise pressure / fuel flow - until I go lean= of=20 lean! There is no

&nbs= p; &= nbsp; =20 indication of any fuel leaking what so ever???

I am planning on cranking = up the=20 fuel pressure on the fuel pump and see if this will make any difference??= ?? It=20 could be an indicator problem I guess??? Will see if I can get closer to = 32=20 psi at takeoff power and if so if I can still get below 40=20 LOP???

Thanks for the inputs ... = Blue=20 Skies ... Alan

Life is NOT a journey to the gra= ve with=20 the intention of arriving safely
in a pretty and well preserved= =20 body, BUT rather to skid in=20 broadside,
= ;=20 thoroughly used up, totally worn out, and=20 proclaiming,
&nb= sp; = =20 "WOW, WHAT A=20 RIDE!!!"

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