Problem with Sankey tap

I just started using a Sankey tap. I'm on my third 1/4 barrel. All three of these, I've had to tap and retap many times. Finally the beer flows. On the one I tapped today, I had to do this tap/retap routine about 12 times before I got beer. What could be the problem, or what am I doing wrong?

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TOM KAN PA
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