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Correct me if I am wrong. Can't you put the fuel selector's on aux push the mixture forward and try hitting the electric pumps If your gauges show fuel flow you can pick up from the aux tanks. If there is no flow you can't. Ours is a Non-turbo 337b Electric fuel pumps only work on main tank and all excess fuel is pumped back in to the mains whether on main or aux. Does your POH say to burn 1 hr fuel from the mains before selecting aux. The reason is so there is room for the extra fuel that will be pumped back into the mains from the aux.
Frank
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