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I was thinking along those lines. It wouldn't be aeration, but cavitation; where would the air come from? If the fuel is warm and the pump agitates it a lot, it could literally cause a boiling type condition, even below the actual boiling point. If the pump is "too hot to touch", well, sounds like it could be a problem. Once you agitate the fuel into a vapor state, it won't recondense quickly.
