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And in the 1976 P337 POH, it has a different statement regarding cross-feeding. From Page 2-8:
Fuel Cross-feeding: Cross-feeding is limited to level flight only. If operating both engines from a single tank, cease cross-feed when level is within:
50 lbs. of empty in tank in use, or
50 lbs. of full in tank not in use.
Apparently, the revisions of the fuel system changed the cross-feeding limitations over the years, so one answer does not fit all aircraft.
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