Return-Path: Received: from out005.verizon.net ([206.46.170.143] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 541302 for flyrotary@lancaironline.net; Sun, 21 Nov 2004 22:21:43 -0500 Received-SPF: pass receiver=logan.com; client-ip=206.46.170.143; envelope-from=finn.lassen@verizon.net Received: from verizon.net ([4.12.145.173]) by out005.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20041122032112.CUMX13638.out005.verizon.net@verizon.net> for ; Sun, 21 Nov 2004 21:21:12 -0600 Message-ID: <41A15B27.3080404@verizon.net> Date: Sun, 21 Nov 2004 22:21:11 -0500 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: Re: [FlyRotary] Re: Bubbles in fuel line from pump References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------040303000005030304090300" X-Authentication-Info: Submitted using SMTP AUTH at out005.verizon.net from [4.12.145.173] at Sun, 21 Nov 2004 21:21:12 -0600 This is a multi-part message in MIME format. --------------040303000005030304090300 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Thanks Rusty (on both counts:)! That had occured to me and I did inspect it when I had it out for the gravity flow test. But replacing it temporarily with a plug is definitely worth a try! Finn Russell Duffy wrote: > Removed flow sensor and filter and amount of bubbles appeared to be > significantly less. Put sensor back in, and bubbles reappeared, > > > Very baffling. Here's my best 3 beer guess: > > What sort of "drain point" do you have? I'm assuming this is one of > the many spring loaded valves that are commonly used to check for > water in the low points of the system. If so, and the spring is > getting weak on the drain valve, I'd bet that's where you're sucking > in air. When you removed the flow sensor and filter, that reduced the > restriction upstream from the drain point, and reduce the tendency to > suck air in through the valve. If this is one of those spring loaded > valve, I'd start by changing it, or plugging it up temporarily. > > Good luck, > Rusty (giving Finn a break on the smart a** comments) > > > --------------040303000005030304090300 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Thanks Rusty (on both counts:)!

That had occured to me and I did inspect it when I had it out for the gravity flow test.
But replacing it temporarily with a plug is definitely worth a try!

Finn

Russell Duffy wrote:

Message
Removed flow sensor and filter and amount of bubbles appeared to be
significantly less. Put sensor back in, and bubbles reappeared,

Very baffling. Here's my best 3 beer guess:

What sort of "drain point" do you have? I'm assuming this is one of the many spring loaded valves that are commonly used to check for water in the low points of the system. If so, and the spring is getting weak on the drain valve, I'd bet that's where you're sucking in air. When you removed the flow sensor and filter, that reduced the restriction upstream from the drain point, and reduce the tendency to suck air in through the valve. If this is one of those spring loaded valve, I'd start by changing it, or plugging it up temporarily.

Good luck,

Rusty (giving Finn a break on the smart a** comments)

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