Do you have the container sitting on the floor, pumping a few feet up? That might be too much for the little pump.
Although, if it worked before, and then stopped, that does sound like a leak. I wouldn't trust silicon and hoses... doesn't bond very well.
If you look at my solution... I used a little plastic syringe to bridge the pump output with the airline. If you find one of those oral syringes with the same diameter as your pump output, you just use a piece of hose (16/22mm) to connect the pump and the syringe. The airline then fits on top of the syringe.
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