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Message-ID: <1c23473f0612252053l534f0fb2h6572e17ec1761637@mail.gmail.com>
Date: Mon, 25 Dec 2006 20:53:31 -0800
From: "David Leonard" <wdleonard@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: fuel pumps
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I use the pumps that Tracy sells set up in parallel.  I had one fail after
about 150 hrs.  The failure mode was very soft.  It just stated making lower
output.  Since the pressure is set by the regulator, I only noticed that the
pump was failing because the normal fuel flow started dropping off
dramatically over the course of a few hours.  Normal pump output at 35psi is
about 40 gal/hr.  With both pumps on the flow is 80 gal/hr.  When the pump
died flow fell off to about 20 gal/hr without a drop in pressure.

It was nice to know about the failure early.  But to do that you will need a
fuel flow gauge somewhere in the system.

-- 
David Leonard

Turbo Rotary RV-6 N4VY
My websites at:
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/_ht_a/vp4skydoc/index.html
http://leonardiniraq.blogspot.com

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<div><br>I use the pumps that Tracy sells set up in parallel.&nbsp; I had one fail after about 150 hrs.&nbsp; The failure mode was very soft.&nbsp; It just stated making lower output.&nbsp; Since the pressure is set by the regulator, I only noticed that the pump was failing because the normal fuel flow started dropping off dramatically over the course of a few hours.&nbsp; Normal pump output at 35psi is about 40 gal/hr.&nbsp; With both pumps on the flow is 80 gal/hr.&nbsp; When the pump died flow fell off to about 20 gal/hr without a drop in pressure.
</div>
<div>&nbsp;</div>
<div>It was nice to know about the failure early.&nbsp; But to do that you will need a fuel flow gauge somewhere in the system.<br clear="all"><br>-- <br>David Leonard<br><br>Turbo Rotary RV-6 N4VY<br>My websites at:<br><a href="http://members.aol.com/_ht_a/rotaryroster/index.html">
http://members.aol.com/_ht_a/rotaryroster/index.html</a><br><a href="http://members.aol.com/_ht_a/vp4skydoc/index.html">http://members.aol.com/_ht_a/vp4skydoc/index.html</a><br><a href="http://leonardiniraq.blogspot.com">
http://leonardiniraq.blogspot.com</a> </div>

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