My seatpost pump from 2010 died around 2015. When attached to an inflated tire, the pump stick would simply extend all the way and the pressure was so high that I couldn't pump. I assume that a rubber seal has probably failed. I couldn't figure out how to open it to take a look, so I went for a thudbuster instead, and changed to Schwalbe tires with greenguard, and haven't had a puncture since. I bought a tiny topeak handpump to carry with me on trips but never used it.