[BitWielder1]

The extra weight of the liquid in the longer leg keeps it going. We seem to agree on that part.
We in the pressure group maintain that the short leg of the siphon will stop working then the external pressure is insufficient to push the liquid up to the bend.
I'll allow a small extra height difference for the tensile strength, except for liquids like water that start boiling at low pressure.

[UnbelievingScumOnTheOtherSide]

I'll allow a small extra height difference for the tensile strength, except for liquids like water that start boiling at low pressure.

That "small difference" is some 300 feet in California sequoias.

[Cyber Liberty]

The pressure cannot be responsible for pushing the water up the small leg because the same pressure is applied to the water up the large leg. It cancels out in equilibrium. The siphon is 100% gravity.

[Wissa]

We in the pressure group maintain that the short leg of the siphon will stop working then the external pressure is insufficient to push the liquid up to the bend.

So does that mean I can't have a water well more than 33 feet deep?