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Certified planes that have both tanks plumbed together have the two tanks vented together also. This cross connection of the vents helps to minimize uneven flow due to uneven pressure inside the tanks. If I was building a 750 I would use a fuel tank selector and only run one tank at a time. That, to me, is less hassle than working up a cross connected vent system and it gives you the ability to not use a tank that has contaminated fuel in it or has sprung a leak.
Ditto
My right tank always seems to have more fuel in it even though I set the valve to both AND return fuel to the pilot side tank only. I have vent "snorkels" on top of the caps as well.
Tim
FUEL PROBLEM
Read with interest over the years about un-equal fuel flow. I must have lucked out because I do not have this problem. Why??? I never used the supplied tank caps but bought caps from Wag Aero. For some reason I bought the E - 481 - 000 caps (call them and ask if the cheaper E - 476 - 000 caps will work). I carefully bent the straight pipe at a little more than ninety degrees to face the wind - read constant ram air pressure on both tanks - and my tanks stay level all day from start to a couple of gallons left. And because the vents are a couple of inches high they don't leak all over the top of the wing when the tank is filled up to the top of the standpipe. As far as my plumbing: the two feeds are not of equal length down to the Zenith supplied square aluminum gascolator on the bottom of the fuselage. Try the new caps - might solve all your problems - just make sure that you have a seal at the tank to cap juncture - I keep mine lubed with white grease from time to time.
Phil
CH 701
Almost 200 hrs on plane
That's why I interconnected my tanks with an Andair fuel selector valve with "Left, Right, Both, and Off". That way, you have independent lines from each tank so you can use one tank or the other to burn off imbalances and then use the "both" setting to interconnect them when desired. There also is the advantage should you ever get contaminated fuel in one tank, you can shut that tank off and just run on the other tank.
John
N750A
very common observation ..In a lot of planes that have a both on the fuel selector... lentgh of fuel line left and right not the same a possibility , elbows and curves in fuel line etc, wings level ?? However don't be worried because the flow will keep going even when the tanks are not even, meaning if the left tank gets low enough more fuel will come from the right, cessna (and 701) drivers are totally used to this
no worries, Harmen
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