X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.253] (HELO mail.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3640999 for flyrotary@lancaironline.net; Wed, 13 May 2009 10:48:28 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.253; envelope-from=bhughes@qnsi.net Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C9D3E2.5148C344" Subject: RE: [FlyRotary] Re: Fuel Pressure Regulator \ Vacuum Leak Disposition-Notification-To: "Bobby J. Hughes" Content-class: urn:content-classes:message Date: Wed, 13 May 2009 09:48:53 -0600 x-mimeole: Produced By Microsoft Exchange V6.5 Message-ID: <74120FDE88CAFE4DBDA8814BCE20A3F315E1A1@qnsi-mail.qnsi.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Fuel Pressure Regulator \ Vacuum Leak thread-index: AcnT38X5rzYio7qORiyEWnhtDvuhnQAAYAqw References: From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C9D3E2.5148C344 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Steve, =20 My fuel pressure has always been rock solid. Aeromotive said no problem regulating fuel pressure in the mid 30's when using Walbro 391 pumps.=20 =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of sboese Sent: Wednesday, May 13, 2009 7:49 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Fuel Pressure Regulator \ Vacuum Leak 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's ------_=_NextPart_001_01C9D3E2.5148C344 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Steve,
 
My fuel pressure has always been rock solid.=20 Aeromotive said no problem regulating fuel pressure in = the mid=20 30's when using Walbro 391 pumps.
 
Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of = sboese
Sent:=20 Wednesday, May 13, 2009 7:49 AM
To: Rotary motors in=20 aircraft
Subject: [FlyRotary] Re: Fuel Pressure Regulator \ = Vacuum=20 Leak

Bobby,

 

My Mallory = adjustable=20 fuel pressure regulator has the same problem of a vacuum leak through = the=20 adjustment screw threads.  Placing a gasket between the jam nut and = the=20 regulator body in addition to a gasket between the jam nut and an acorn = type nut=20 installed after adjusting the pressure eliminated the leak.  This = regulator=20 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=20 other modifications to it since as received, it could not maintain a = constant=20 pressure within +/-10 psi.  The archives have more information on = this=20 adventure.

 

Steve=20 Boese

 

 

 

-----Original=20 Message-----
From: = Rotary=20 motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. = Hughes
Sent: Wednesday, May 13, 2009 = 6:49=20 AM
To: Rotary motors = in=20 aircraft
Subject: = [FlyRotary]=20 Re: Fuel Pressure Regulator \ Vacuum Leak

 

Al,

 

I will=20 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=20 40 psi may improve things. I discovered the minimum design operating = pressure=20 for this regulator is 40 psi. If the leak is around the adjustment screw = then=20 screwing it in further may help. May not.

 

One step=20 forward and two steps back.

 

Bobby's

------_=_NextPart_001_01C9D3E2.5148C344--