Return-Path: Received: from out014.verizon.net ([206.46.170.46] verified) by logan.com (CommuniGate Pro SMTP 4.2b4) with ESMTP id 123209 for flyrotary@lancaironline.net; Thu, 03 Jun 2004 23:37:45 -0400 Received: from verizon.net ([4.12.145.173]) by out014.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040604033715.RNDN24784.out014.verizon.net@verizon.net> for ; Thu, 3 Jun 2004 22:37:15 -0500 Message-ID: <40BFEE65.3020204@verizon.net> Date: Thu, 03 Jun 2004 23:37:09 -0400 From: Finn Lassen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Facet pump - foam References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------030906050705070107000906" X-Authentication-Info: Submitted using SMTP AUTH at out014.verizon.net from [4.12.145.173] at Thu, 3 Jun 2004 22:37:15 -0500 This is a multi-part message in MIME format. --------------030906050705070107000906 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I took one of my Facet fuel pumps apart this evening. One of the square solid state types. Sunday nigth when I wanted to go fly one of the pumps didn't when I turned on the power. After fiddeling a bit with it it started up. I'd also noticed occasional fuel pressure drops (very brief). This lead me to believe that the pump was intermittently bad. I'm very impressed with the construction of these pumps. All of the electronics are embedded completely in foam. It's hard to see how one of these pumps could fail electrically. I suppose that heat cycling could lead to a bad connection on the circuit board even though all components are held firmly in place by the foam. Of course it's impossible to inspect the electronics because of the foam. Anybody here know of a solvent that will dissolve the foam and not harm the electronic components and circuit board? Finn --------------030906050705070107000906 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit I took one of my Facet fuel pumps apart this evening. One of the square solid state types.

Sunday nigth when I wanted to go fly one of the pumps didn't when I turned on the power. After fiddeling a bit with it it started up. I'd also noticed occasional fuel pressure drops (very brief).
This lead me to believe that the pump was intermittently bad.

I'm very impressed with the construction of these pumps. All of the electronics are embedded completely in foam.
It's hard to see how one of these pumps could fail electrically. I suppose that heat cycling could lead to a bad connection on the circuit board even though all components are held firmly in place by the foam.

Of course it's impossible to inspect the electronics because of the foam.

Anybody here know of a solvent that will dissolve the foam and not harm the electronic components and circuit board?

Finn
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