X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from hub026-NJ-6.exch026.serverdata.net ([206.225.166.169] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6292242 for flyrotary@lancaironline.net; Mon, 27 May 2013 12:18:21 -0400 Received-SPF: none receiver=logan.com; client-ip=206.225.166.169; envelope-from=jwhaley@datacast.com Received: from MBX026-E1-NJ-6.exch026.domain.local ([10.240.14.56]) by HUB026-NJ-6.exch026.domain.local ([10.240.14.230]) with mapi id 14.03.0123.003; Mon, 27 May 2013 09:17:45 -0700 From: Jeff Whaley To: Rotary motors in aircraft Subject: RE: Intermittent fuel pressure loss Thread-Topic: RE: Intermittent fuel pressure loss Thread-Index: Ac5a9bg0sYZXRP+KQzSjEEivzRFHcA== Date: Mon, 27 May 2013 16:17:45 +0000 Message-ID: <234B758DE9A64449BEB6BB5D1345CA7A35F74101@mbx026-e1-nj-6.exch026.domain.local> Accept-Language: en-CA, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [209.87.232.162] Content-Type: multipart/related; boundary="_005_234B758DE9A64449BEB6BB5D1345CA7A35F74101mbx026e1nj6exch_"; type="multipart/alternative" MIME-Version: 1.0 --_005_234B758DE9A64449BEB6BB5D1345CA7A35F74101mbx026e1nj6exch_ Content-Type: multipart/alternative; boundary="_000_234B758DE9A64449BEB6BB5D1345CA7A35F74101mbx026e1nj6exch_" --_000_234B758DE9A64449BEB6BB5D1345CA7A35F74101mbx026e1nj6exch_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Bill, I had a complete fuel pump failure but did not experience an intermit= tent in between, possibly because the pump failure was not noticed until th= e other was shut off. I believe my pump failure was due to insufficient fuel to 1 pump caused by = a fuel routing change made prior to flight which revealed failed pump. If the pumps are operating with low fuel flow (unported) they may be damage= d - but I don't know how long this takes - my flight was about 15 minutes. If nothing else has changed in your system, then your plan of action to cle= an the gascolator, replacing fuel filter and pump should clear things up. I would also recommend a thorough ground run of each pump with high rpm and= low rpm in the pre-flight checklist. Do you have aluminum or fiberglass tanks? Check the venting of your fuel return lines. Jeff From: "Bill Bradburry" Subject: Intermittent fuel pressure loss Date: Mon, 27 May 2013 10:09:06 -0400 To: "'Rotary motors in aircraft'" [Message Header] [Undecoded Message] Has anyone had an instance of intermittent failure of the fuel pumps? A couple of days ago the engine started to intermittently lose power and changed tanks. (both tanks were low, about 5 gal in right and 10 or so in left) The problem stopped so I thought I had unported the right tank. Several minutes later it started again on the left tank and I turned on the other fuel pump. That seemed to stop it again. I still suspected that I had unported the tanks. A couple of days later, I took off with about 45 gal and after about a 30 min flight, the engine lost power again twice. I turned the other fuel pum= p on and the problem stopped. My fuel system goes thru a Gascolator then to the two pumps, then to a fuel filter. I assume that the Gascolator or the fuel filter could be getting clogged, but I don't think that the other pump would bring the pressure bac= k if that were the case. I only have about 70 flight hours on the pump and maybe about 100 hours total including ground runs. Also on the flight back, I had both pumps on and showing 40 lbs of pressure= . I then turned the secondary pump off and the pressure held at 40 lbs. This strikes me that it is an intermittent pump failure. I plan to clean the Gascolator, replace the fuel filter, and replace the pump. Any thoughts, suggestions, experiences? My wife was with me on the last incident and I don't think she is intereste= d in trying to join Ed's glider club! Bill B This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized disclosure is strictly prohibited. If you have received this message= in error, please notify us immediately so that we may correct our internal= records. Please then delete the original message. Thank you. --_000_234B758DE9A64449BEB6BB5D1345CA7A35F74101mbx026e1nj6exch_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bill, I had a complete fuel pump failure but did not= experience an intermittent in between, possibly because the pump failure w= as not noticed until the other was shut off.

I believe my pump failure was due to insufficient fu= el to 1 pump caused by a fuel routing change made prior to flight which rev= ealed failed pump.

If the pumps are operating with low fuel flow (unpor= ted) they may be damaged – but I don’t know how long this takes= – my flight was about 15 minutes.

If nothing else has changed in your system, then you= r plan of action to clean the gascolator, replacing fuel filter and pump sh= ould clear things up.

I would also recommend a thorough ground run of each= pump with high rpm and low rpm in the pre-flight checklist.

Do you have aluminum or fiberglass tanks?

Check the venting of your fuel return lines.

Jeff

 

From:

"Bill Bradburry" <bbradbur= ry@bellsouth.net>

Subject:

Intermittent fuel pressure loss<= /p>

Date:

Mon, 27 May 2013 10:09:06 -0400<= /p>

To:

"'Rotary motors in aircraft'"= <flyrotary@lancaironline.net>

3D"Message

=

Has anyone had an instance= of intermittent failure of the fuel pumps?  A
<= br>























 

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