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John, what make gauges/sensors are you using in the fuel system? I have some of the older UMA gauges. They have a voltage regulator inside, which when it starts to go belly-up, causes the gauges to start reading higher than normal (intermittently). In fact, they will sometimes peg to the high side (intermittently) as they age and finally go bad.
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda/index.html
----- Original Message ----- From: "John Slade" <sladerj@sbcglobal.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, May 25, 2008 5:19 PM
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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