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No. Siphoning has no bearing on this issue. My barrel just has the lid sitting on top, so there is no vacuum happening. a ling running out of the top of the barrel does no good as that is not gravity feeding. Gravity feeding means that the point of water that is exiting must be slightly higher than the nipples to feed it water using gravity and no power. To raise the water up and out the top of the barrel would require a pump.
It's just simple math here. The nipples require 1-5 PSI of water pressure max to function. A barrel the size of mine provides way may PSI thanks to the weight of the water. Therefore, the nipples will leak because there is more pressure than they need involved. The PSI has to match up. The Little Giant waterer allows for up to 70 PSI, therefore it will work perfectly.