John,

For those type of symptoms, the first thing I would look at is the
sender of the gauge.

Neil K



-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of John Slade
Sent: Sunday, May 25, 2008 5:19 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Fuel pressure question

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

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