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From: "Christopher Zavatson" <Christopher.Zavatson@baesystems.com>
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Subject: Re: [LML] 320 low fuel pressure indication
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X-OriginalArrivalTime: 07 Sep 2005 22:26:03.0002 (UTC) FILETIME=[217E5DA0:01C5B3FB]

Gerard,
<<Has anyone else noticed fuel pressures dropping to minimum during the =
cruise and then rising again on the 320>>
I have observed similar behavior on my O-360.  It was quite alarming the =
first time I noticed on a long cross country several years ago - every so =
often, a slow decline from 6 psi down to 2 psi. and then back up again =
(note: minimum for the engine is 0.5 psi).  It happens only at high =
altitude. =20
I did a little research on the matter.  It turns out Piper did some =
investigating as this was a common occurrence on the O-360 in their =
planes.  After many theories were tested and ruled out, they were left =
stumped by this phenomenon.  It only occurred at low fuel flows, either =
part throttle or full throttle up high.  They finally left the matter as =
an unexplained, but harmless, quirk.

Chris Zavatson
N91CZ
360 std
www.N91CZ.com