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Both of those probably are far enough away from the pickup part of things to allow the fuel to de-aerate..
Right, the main reason to keep the return line all the way to the bottom, as specified in the Cummins Shop manual is to;

Keep it from areateong /foaming when returning fuel to less than a full tank. Keep the pickup far as possible from the return and you should not have problems, you dont want to pickup fuel that has air bubbles in it/foam from the return line

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