I think if you have extended cranking, you have an air leak which will cause rough idle. Also, if you are draining the tank.. Don't bother touching any hard lines. Don't waste your time and invest in a mityvac fluid extractor and do it through the back. Take out the fuel tank sender (its a 46mm socket 3/4), but instead put a large pair of vice grips on there or channel locks and take it off. It has very little torque and evacuate the gas once your below a quarter of a tank and on reserve.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k