Return-Path: Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 728255 for flyrotary@lancaironline.net; Mon, 14 Feb 2005 10:54:05 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=sqpilot@bellsouth.net Received: from [216.78.114.11] by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050214155308.IWMQ1983.imf16aec.mail.bellsouth.net@[216.78.114.11]> for ; Mon, 14 Feb 2005 10:53:08 -0500 Received: from 127.0.0.1 (AVG SMTP 7.0.300 [265.8.7]); Mon, 14 Feb 2005 09:52:02 -0600 Message-ID: <03c101c512ac$eee950b0$cf2cd6d1@paul52u7f5qyav> From: "Paul" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Bad day at the airport Date: Mon, 14 Feb 2005 09:41:28 -0600 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-4210C9222358=======" --=======AVGMAIL-4210C9222358======= Content-Type: multipart/alternative; boundary="----=_NextPart_000_035E_01C51279.5BB357B0" ------=_NextPart_000_035E_01C51279.5BB357B0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi, Mark...my humblest appologies for taking so long to respond. I am = whittling down the 200 plus messages in my inbox. I was using auto fuel = (regular). I have a fuel return line and it goes to the top of my = aluminum sump tank that is located on the cool side of the firewall = (inside the cabin, behind the rear seat). The return line is -8 in size. = Hope this helps. Paul Conner ----- Original Message -----=20 From: Mark R Steitle=20 To: Rotary motors in aircraft=20 Sent: Wednesday, February 09, 2005 7:45 AM Subject: [FlyRotary] Re: Bad day at the airport =20 =20 -------------------------------------------------------------------------= ----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Al Gietzen Sent: Tuesday, February 08, 2005 5:55 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Bad day at the airport =20 Do you have a bleed circuit between your pump and fuel pressure regulator? Do you have heat shields on your fuel lines? My guess is = that you may have experienced vapor lock. Without a bleed circuit, the = fuel pump can't produce enough pressure to overcome the fuel pressure regulator =20 This should only be an issue if the pump is not located at the lowest = point in the line from the tank. As long as there is liquid at the pump = inlet - no problem. =20 Al =20 Al,=20 What happens if the lines in the engine bay and fuel pumps get hot = enough for the fuel to boil inside them? Are the pumps still going to = produce enough pressure to function normally? My guess is no. Paul = said his coolant temp was 210+. He had been doing extended ground runs = followed by some taxiing, which would allow for lots of heat soak and = little cooling air. I imagine the fuel pumps and lines were pretty = warm. Maybe warm enough to cause vapor lock. =20 =20 I would also like to know what type of fuel he was using at the time? = If he was running mogas, has he checked the vapor pressure of the fuel? = =20 Paul, do you have a return on your fuel system? If so, where does it = return to? What size lines? =20 =20 Mark S. =20 =20 -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.6 - Release Date: 2/7/2005 ------=_NextPart_000_035E_01C51279.5BB357B0 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hi, Mark...my humblest appologies for = taking so=20 long to respond.  I am whittling down the 200 plus messages in my=20 inbox.  I was using auto fuel (regular). I have a fuel return line = and it=20 goes to the top of my aluminum sump tank that is located on the cool = side of the=20 firewall (inside the cabin, behind the rear seat). The return line is -8 = in=20 size.  Hope this helps.  Paul Conner
----- Original Message -----
From:=20 Mark R Steitle =
Sent: Wednesday, February 09, = 2005 7:45=20 AM
Subject: [FlyRotary] Re: Bad = day at the=20 airport

 

 

From:=20 Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On=20 Behalf Of Al Gietzen
Sent: Tuesday, February 08, = 2005 5:55=20 PM
To: = Rotary motors in aircraft
Subject: [FlyRotary] Re: Bad = day at the=20 airport

 

Do you have a bleed circuit between your = pump and fuel=20 pressure

regulator? Do you have heat shields on your = fuel=20 lines? My guess is that

you may have experienced vapor lock.  = Without a=20 bleed circuit, the fuel

pump can't produce enough pressure to = overcome the=20 fuel pressure

regulator

 

This = should only=20 be an issue if the pump is not located at the lowest point in the line = from=20 the tank.  As long as there is liquid at the pump inlet =96 no=20 problem.

 

Al

 

Al,=20

What = happens if the=20 lines in the engine bay and fuel pumps get hot enough for the fuel to = boil=20 inside them?  Are the pumps still going to produce enough = pressure to=20 function normally?  My guess is no.   Paul said his = coolant=20 temp was 210+.  He had been doing extended ground runs followed = by some=20 taxiing, which would allow for lots of heat soak and little cooling = air. =20 I imagine the fuel pumps and lines were pretty warm.  Maybe warm = enough=20 to cause vapor lock. =20     

 

I would = also like to=20 know what type of fuel he was using at the time?  If he was = running=20 mogas, has he checked the vapor pressure of the fuel? =20

 

Paul, do = you have a=20 return on your fuel system?  If so, where does it return = to?  What=20 size lines? =20 =         =

 

Mark=20 S.

 

 =20   

No virus found in this incoming message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.6 - Release = Date:=20 2/7/2005
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