Return-Path: <13brv3@bellsouth.net> Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 541287 for flyrotary@lancaironline.net; Sun, 21 Nov 2004 22:08:23 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf17aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20041122030753.CNAO1994.imf17aec.mail.bellsouth.net@rd> for ; Sun, 21 Nov 2004 22:07:53 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Bubbles in fuel line from pump Date: Sun, 21 Nov 2004 21:08:17 -0600 Message-ID: <01d401c4d040$83c7f2e0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01D5_01C4D00E.392D82E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_01D5_01C4D00E.392D82E0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit 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) ------=_NextPart_000_01D5_01C4D00E.392D82E0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

Removed flow sensor and filter and amount of bubbles = appeared to=20 be
significantly less. Put sensor back in, and bubbles = reappeared,

 
Very = baffling. =20 Here's my best 3 beer guess:
 
What = sort of "drain=20 point" do you have?  I'm assuming this is one of the many spring = loaded=20 valves that are commonly used to check for water in the low points of = the=20 system.  If so, and the spring is getting weak on the drain valve, = I'd bet=20 that's where you're sucking in air.  When you removed the flow = sensor and=20 filter, that reduced the restriction upstream from the drain point, = and=20 reduce the tendency to suck air in through the valve.   If = this is one=20 of those spring loaded valve, I'd start by changing it, or plugging it = up=20 temporarily. 
 
Good=20 luck,
Rusty = (giving Finn a=20 break on the smart a** comments)



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