I agree with Goose, what you are hearing is probably air sucking into the gas tank. Possibly the vent in the cap is blocked with ice if it was below freezing.
Or it could be a vacuum leak, but that should be constant, not happen after running 20 minutes.
As for the starter, most leave the 6v starter on. If you are careful not to crank on it too long, the starter windings will handle 12v just fine.
But... Some tractors handle the hard hitting 6v starter better than others. The problems can be broken drive gear, damaged flywheel gear, broken starter housings, etc., while others seem to have no problems at all. Depends on the design, how hard the engine starts, and how often it is started. Something that may lessen the damage is to use a low CCA battery.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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