Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Mon, 14 Mar 2005 11:05:19 -0500 Message-ID: X-Original-Return-Path: Received: from wind.imbris.com ([216.18.130.7] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP-TLS id 792472 for lml@lancaironline.net; Mon, 14 Mar 2005 10:20:36 -0500 Received-SPF: none receiver=logan.com; client-ip=216.18.130.7; envelope-from=brent@regandesigns.com Received: from [192.168.1.100] (wireless-216-18-135-19.imbris.com [216.18.135.19]) (authenticated bits=0) by wind.imbris.com (8.12.11/8.12.11.S) with ESMTP id j2EFJppr035597 for ; Mon, 14 Mar 2005 07:19:51 -0800 (PST) (envelope-from brent@regandesigns.com) X-Original-Message-ID: <4235AB92.4090107@regandesigns.com> Disposition-Notification-To: Brent Regan X-Original-Date: Mon, 14 Mar 2005 07:19:46 -0800 From: Brent Regan User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Subject: Re: More on mistery "Bang" IV-P 550 continental Content-Type: multipart/alternative; boundary="------------060004050401020803020904" This is a multi-part message in MIME format. --------------060004050401020803020904 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Andre writes: << Low fuel boost makes engine run rough>> Any chance the fuel pump is sucking air past its shaft seal when it is running? This could be a symptom of worn pump bearings or seal. A simple test would be to remove the cowl and disconnect the fuel line from the engine and put it into a clean bucket (extend the hose as needed). Have an assistant and fire extinguisher handy. Turn on the fuel pump and, after the flow is established submerge the end of the hose to check for bubbles. While you are at it, time the flow to verify sufficient GPMs. You should also verify that the fuel pump vent line is connected to the outside vent. Having cabin pressure at this port would make the problem worse. With the setup above and the pump running, blow a little air into the vent and see if that makes bubbles. Perhaps not savvy or wise, but something to test. Regards Brent Regan --------------060004050401020803020904 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Andre writes:

<< Low fuel boost makes engine run rough>>

Any chance the fuel pump is sucking air past its shaft seal when it is running? This could be a symptom of worn pump bearings or seal.

A simple test would be to remove the cowl and disconnect the fuel line from the engine and put it into a clean bucket (extend the hose as needed). Have an assistant and fire extinguisher handy. Turn on the fuel pump and, after the flow is established submerge the end of the hose to check for bubbles.

While you are at it, time the flow to verify sufficient GPMs.

You should also verify that the fuel pump vent line is connected to the outside vent. Having cabin pressure at this port would make the problem worse. With the setup above and the pump running, blow a little air into the vent and see if that makes bubbles.

Perhaps not savvy or wise, but something to test.

Regards
Brent Regan
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