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Message-ID: <4839D7CE.9070001@sbcglobal.net>
Date: Sun, 25 May 2008 17:19:10 -0400
From: John Slade <sladerj@sbcglobal.net>
Reply-To: sladerj@sbcglobal.net
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Fuel pressure question
References: <list-2932258@logan.com>
In-Reply-To: <list-2932258@logan.com>
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Yesterday I noticed some strange fuel pressure behavior. Fuel pressure 
before start-up is usually about 42 PSI, 44 when I run the second pump. 
After start-up it settles down to around 32 with the vacuum driven 
regulator. Yesterday it was 56, (58 with the second pump) and stayed 
over 40 after start-up. The engine ran normally and mixture seemed about 
where it always is. Fuel pressure was over 40 on the run-up, so I taxied 
back to the hangar. I couldn't find anything obviously wrong with the 
vacuum to the regulator, so I tried again. Fuel pressure was again in 
the mid fifties before start-up, but dropped back to normal during the 
run-up, so I took her up. Everything seemed normal during a half-hour 
flight. The only thing I can come up with is that I cleaned the filters 
during the annual and removed a very slight amount of crud from one of them.
I keep thinking the plane is trying to tell me something. Any theories what?
John