|
Well I said earlier that my excess fuel went into "the mains." Actually it probably goes back to the "manifold." But that doesn't mean it is all "used" again by the engines. If that were the case you'd never have to worry about burning some fuel out of the mains before switching to the aux. tanks. My '67 turbo (I'm at work and can't look at the diagrams) is probably the same, and if you have full mains and switch immediately to the aux. tanks you won't get full use of the fuel because the excess (that not burned by the engines) goes bye-bye. Once an hour's worth is gone from the mains you can safely switch because no matter how much goes back into the mains it can't overflow them since you'll always be using some out fo the aux. tanks. And it never goes back into the aux. tanks.
I customarily get aroun 1.5 hours on the aux. tanks, running around 72% power settings.
|