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Location: Rochester, NY
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Many floor pumps have what's known as a check valve in their base. A valve that lets the compressed air travel from the cylinder to the hose but stops air from going the other direction. BTW a Presta valve does the same function but at the other end of the hose. Sometimes these check valves can get plugged up or frozen shut (grime, rust). With a Presta tube valve a simple tap of the end of the unthreaded knurled finger nut is usually enough to break loose the stickiness (as mentioned by others). But for the pump base's check valve one has to take the base apart and most current floor pumps are not made to be serviced at this level and replacement parts (even if one could take the base apart) will be unavailable. Most current floor pumps are considered to be a commodity and disposable. Andy
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AndrewRStewart