X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from willowsprings.uwyo.edu ([129.72.10.31] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTPS id 3640976 for flyrotary@lancaironline.net; Wed, 13 May 2009 10:29:36 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.31; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht2.uwyo.edu (ponyexpress-ht2.uwyo.edu [10.84.60.209]) by willowsprings.uwyo.edu (8.14.2/8.14.2) with ESMTP id n4DERPjE008413 for ; Wed, 13 May 2009 08:28:29 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from Boesexps (172.26.4.5) by uwmail.uwyo.edu (10.84.60.199) with Microsoft SMTP Server id 8.1.358.0; Wed, 13 May 2009 07:49:15 -0600 From: sboese To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Fuel Pressure Regulator \ Vacuum Leak Date: Wed, 13 May 2009 07:49:10 -0600 Message-ID: <1C7ABE29A1804714A29A76D95EAA58C0@gg.uwyo.edu> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01C9D39F.4D005CE0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 ------=_NextPart_000_001C_01C9D39F.4D005CE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Bobby, =20 My Mallory adjustable fuel pressure regulator has the same problem of a vacuum leak through the adjustment screw threads. Placing a gasket = between the jam nut and the regulator body in addition to a gasket between the = jam nut and an acorn type nut installed after adjusting the pressure = eliminated the leak. This regulator is also being used at the low end of its rated range and it is unable to maintain a constant fuel pressure better than = +/- 3 psi. This is after other modifications to it since as received, it = could not maintain a constant pressure within +/-10 psi. The archives have = more information on this adventure. =20 Steve Boese =20 =20 =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes Sent: Wednesday, May 13, 2009 6:49 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Fuel Pressure Regulator \ Vacuum Leak =20 Al, =20 I will contact Aeromotive tech support today and see if it's possibly a leaking diaphragm that can be fixed. I also suspect raising my fuel = pressure from 36 to 40 psi may improve things. I discovered the minimum design operating pressure for this regulator is 40 psi. If the leak is around = the adjustment screw then screwing it in further may help. May not. =20 One step forward and two steps back. =20 Bobby ------=_NextPart_000_001C_01C9D39F.4D005CE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bobby,

 

My Mallory adjustable fuel pressure regulator has the same problem of a vacuum leak through the adjustment = screw threads.  Placing a gasket between the jam nut and the regulator = body in addition to a gasket between the jam nut and an acorn type nut installed = after adjusting the pressure eliminated the leak.  This regulator is also = being used at the low end of its rated range and it is unable to maintain a = constant fuel pressure better than +/- 3 psi.  This is after other = modifications to it since as received, it could not maintain a constant pressure within = +/-10 psi.  The archives have more information on this adventure.

 

Steve Boese

 

 

 

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes
Sent: Wednesday, May 13, = 2009 6:49 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = Fuel Pressure Regulator \ Vacuum Leak

 

Al,=

 

I will contact = Aeromotive tech support today and see if it's possibly a leaking diaphragm that can = be fixed. I also suspect raising my fuel pressure from 36 to 40 psi may = improve things. I discovered the minimum design operating pressure for this = regulator is 40 psi. If the leak is around the adjustment screw then screwing it = in further may help. May not.

 

One step forward = and two steps back.

 

Bobby

------=_NextPart_000_001C_01C9D39F.4D005CE0--