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Ron:
I think the language of the POH still leaves unclear the question of fuel return. As you can see in the diagram, there is a return line from the manifold back to the tanks, with an arrow pointing to the tanks. Is the vent only for vapors or both vapors and fuel?My guess is that some excess fuel goes back to the tanks, but it might be a minimal amount, with most "recirculated to the engine-driven pumps".
Ernie
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