Return-Path: Received: from out010.verizon.net ([206.46.170.133] verified) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP id 150393 for flyrotary@lancaironline.net; Sat, 12 Jun 2004 22:22:21 -0400 Received: from verizon.net ([4.12.145.173]) by out010.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040613022150.CGEU15848.out010.verizon.net@verizon.net> for ; Sat, 12 Jun 2004 21:21:50 -0500 Message-ID: <40CBBA37.3010409@verizon.net> Date: Sat, 12 Jun 2004 22:21:43 -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: Re: [FlyRotary] Re: Low fuel pressure References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------090407000107090601060207" X-Authentication-Info: Submitted using SMTP AUTH at out010.verizon.net from [4.12.145.173] at Sat, 12 Jun 2004 21:21:50 -0500 This is a multi-part message in MIME format. --------------090407000107090601060207 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Found a kinked fuel feed line - explains the total failure this morning. Installed elbows and thicker fuel line to avoid sharp bends, Test flight this evening: better, but still a tendency of pressure drop. Saw as low as 1.4 psi. Finn Russell Duffy wrote: > Any ideas? > > Sounds like a mystery alright. > > - Are you electric pumps the same type? I'm wondering if one might > have better suction capability than the other. Same part #. Spec'd to 2.5 to 4.5 psi. > > - Do you have a fuel pressure sensor on both pumps, or just one? On both. > > - Are your carbs the same? I'm wondering if there's any chance the > center one just doesn't need as much pressure. Obviously the two outer carb needs twice the flow than the center carb. > > - Is there any chance you're losing pressure through that cold start > injector that you plumbed in? That is an excellent possibility. Will try to block off that path tomorrow. > > Just some wild guesses to avoid dodging wasps for a couple more minutes. > > Rusty (as Marlin sits safely in the truck, Rusty goes after the wasps...) > > > > --------------090407000107090601060207 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Found a kinked fuel feed line - explains the total failure this morning.
Installed elbows and thicker fuel line to avoid sharp bends,
Test flight this evening: better, but still a tendency of pressure drop. Saw as low as 1.4 psi.

Finn

Russell Duffy wrote:

Message
Any ideas?

Sounds like a mystery alright.

- Are you electric pumps the same type? I'm wondering if one might have better suction capability than the other.

Same part #. Spec'd to 2.5 to 4.5 psi.

- Do you have a fuel pressure sensor on both pumps, or just one?

On both.

- Are your carbs the same? I'm wondering if there's any chance the center one just doesn't need as much pressure.

Obviously the two outer carb needs twice the flow than the center carb.

- Is there any chance you're losing pressure through that cold start injector that you plumbed in?

That is an excellent possibility. Will try to block off that path tomorrow.

Just some wild guesses to avoid dodging wasps for a couple more minutes.

Rusty (as Marlin sits safely in the truck, Rusty goes after the wasps...)

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