Received-SPF: pass
 receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com
Message-ID: <001501c5b6cb$7810a420$2402a8c0@edward2>
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-718122@logan.com>
Subject: Re: [FlyRotary] mystery inflight fuel pressure drop
Date: Sun, 11 Sep 2005 08:22:25 -0400
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=response
Content-Transfer-Encoding: 7bit

Pressure regulator, leakage in the pumps check valve due to debris, 
something in the fuel filter temporarily obstructing fuel flow, Fuel 
pressure sensor abnormality, pump voltage drop, poor intermittent electrical 
connection.......

Ed A
----- Original Message ----- 
From: "Perry Casson" <pcasson@sasktel.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, September 11, 2005 1:08 AM
Subject: [FlyRotary] mystery inflight fuel pressure drop


> Had a small issue on my last flight that I can not explain - anyone care 
> to venture a guess what was going on?
>
> I was hmmmm-ing along at 7500' on friday about 60 minutes into a 2 hour 
> flight when my EIS low fuel pressure alarm went off and fuel pressure had 
> dropped to 29 psi (alarm set at 30 psi) and the engine went a bit lean.  I 
> switched on my backup pump and fuel pressure instantly went back to the 
> normal 38 psi.  Flew like that for a couple minutes and then decided to do 
> I bit of investigation so I turn the backup pump back off but the fuel 
> pressure remain at the normal 38 psi for the rest of the flight.  No other 
> problems other than I seem to be running a bit leaner  than normal for  a 
> 12 o-clock setting on the EC-2 mixture control.
>
> My install is pretty much a clone of Tracy's pre-Renisis fuel system other 
> than I've got a high wing (Glastar). Feed and return from left tank, fuel 
> line y after a fuel shutoff valve, inline fuel filters upstream of 
> parallel  Federal  Mogul pumps  mounted on cockpit  side of firewall, 
> using stock 89 RX-7 pressure regulator, 88 NA Injectors, no damper.
> I've been try to come with a explanation that would account for such a 
> issue and other than the fuel pressure regulator may have got stuck and 
> the extra flow from turning on the second pump unstuck it.
>
> Perry Casson
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>