sonar1(at)cox.net
Guest
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 Posted: Sat Jul 01, 2006 9:06 pm Post subject: Fuel System Poser - solved! |
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I thank everyone for all of the input about my fuel tanks not feeding
evenly in the 701. Glad I'm not the only one who has experienced this.
The responses were very helpful, leaning toward bubbles being the culprit.
To check it out, I built a fuel system mockup with two tanks, a
gascolator, and 4 gallons per hour output.
It turns out that a bubble in one of the quarter inch lines blocks fuel
flow from that tank completely, even if the line is vertical. Can't
scientifically explain it, but it happens. When the other tank runs dry,
the full tank starts flowing. The bubble either stays where it is, moves
down the line and stays there, or some of it comes out of the output.
I'm sure it is not enough air to cause the engine to quit, but it is
disconcerting to see one tank empty, and one full!
I am making a fuel cap with a 6 foot hose, so I can blow any bubbles
into the opposite tank as part of the preflight before any long flights.
Should fix the problem.
Fred Sanford N9701 Santa Barbara, Ca. 70 hours loving it!
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