Having studied the fuel system in the parts manual, I would have to agree with that. The only path I can see for the fuel to be cross fed is via the valve assembly. I am not familiar with the internal construction of the valve. I looked around on the web and couldn't find an exploded view of the internals, so I can't suggest a specific mechanism, but it seems like something has to be broken inside the valve assembly causing fuel to be drawn from the opposite tank for this to happen.
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