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Greg, I have an electric clock in my plane that is wired to the master switch. When I fill the tanks I set the clock for 12:00. The clock only runs when the engine runs. I know I have enough fuel for about 4 1/2 hours of flying, so I refuel at between 2 1/2 and 3 hours burned. I watch the clock more than the guages. The wire float guages are my backup just in case I have a fuel line leak or some other problem. Syd Greg Bullough wrote: > At 05:57 PM 12/22/02 -0600, Sydney Cohen wrote: > >> Jan, we have the cork-and-wire guage in the header tank and, if we >> have 9 gallon wing tanks, the sight guage in the left tank. If we >> have 7.7 gallon wing tanks, commonly called 8 gallon tanks, we have >> the cork-and-wire guage there. > > > ...which of course do not meet the Fed's requirements of being > accurate when reading > 'empty' because they hit bottom and read empty when the wing tanks are > about > half-full (or half-empty for the pessimists). > > This leads to the Poly-uncertainty period. 'Poly' because the doubt > is about > multiple tanks, and '-uncertainty' because between the time the floats in > the wing bottom out and the header starts dropping (and/or your O-200 > 'fuel pressure' light comes on) you are 'uncertain' about what your real > fuel situation is. This period lasts for over one hour and less than two. > > Of course if you know how much fuel you use and are conservative you don't > really care anyway, because you arrive at your fuel stop a good bit before > the header tank float starts dropping, anyway. Besides, unless you're that > dehydrated Frenchman, Pierre, you really wanted to pee about 15 minutes > before that. > > Greg > > > . > ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm
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