jimmy(at)pfmengineering.c
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 Posted: Mon Jul 08, 2013 8:10 am Post subject: Yak-52 fuel starvation |
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Final thoughts on fuel starvation problem -
I went through the fuel system, screens, vent system, flapper valve assembly, and found nothing out of the ordinary. In theory, one tank running dry should not cause an interruption of the fuel supply, but like many systems, the Yak fuel system has a mind of its own. After hearing of many other fuel starvation stories, I am convinced that when one tank runs dry there is a very good likelihood that the engine will quit for a short time. My personal check list is now modified to include putting the bird on the ground before a tank runs dry.
I did find the slip indicator (ball) 1/8 ball out of adjustment. Flying with the ball centered should now be much closer to coordinated flight and help the tanks feed evenly.
Jim Burke
Yak-52 N426YK
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of jimmy(at)pfmengineering.com
Sent: Tuesday, June 18, 2013 1:53 PM
To: yak-list(at)matronics.com
Subject: Yak-List: Yak-52 fuel starvation
My 1985 Yak-52’s engine quite about 3 miles from the airport last Saturday. After some rapid pumping on the hand primer, the engine fired then quite again, it repeated this several times before running without stopping although somewhat on the rough side. After landing, runup for over 1 minute was normal. Right tank was empty and the left tank had about 10 gallons. I have not torn into the system yet, but have been told to check the screens for debris, and the flexible fuel lines for cavitation. I consulted Dennis Savarese and he said that the right tank running out of fuel would not stop fuel flow to the engine. Anyone have any thoughts on this subject and what to check while I am going through the system?
Jim Burke
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