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Brian,
I have noticed over the years that if left on a slight incline, fuel will migrate one way or the other. Usually takes overnight to notice, though. I have a similar system, but the facet pump is on the front of the wing spar under my seat.
Bill Eslick
RV-6 13B NA RD-1 EC-2 700+ hours
On Sun, Nov 7, 2010 at 7:56 PM, <bktrub@aol.com> wrote:
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Here's another unrelated issue- I have an RV-4, with the fuel being taken out of and returned only to the right tank. I have an AN-6 line feeding a facet pump located just aft of the batteries, and it transfers fuel to my righ hand tank when I want to transfer the fuel.Both tanks are vented separately. Here's the problem: I started out with 12. 5 gallons in the right tank, and 6.5 in the left. After running the engine on the ground for 1 hour, I ended up with 12.7 gallons in the right and 1.7 in the left, without ever having run the transfer pump. The only thing I can think of having happened is that the plane was parked slightly- 1 degree or so-right wing down. The facet pump I believe has a one way valve which would allow fuel to flow downhill to the right tank. That's my theory, can anyone else offer a theory as to why the fuel is self transfering?
Brian Trubee
RV-4
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