Bicycling’s mechanic Joël Nankman says, generally, the more money you spend on a bike pump, the better its quality and longevity—though that rule isn’t firm, and sometimes the most affordable floor pumps can outperform expectations.
These are the most common parts that will break or require maintenance: the pump head, the air hose, the pressure gauge, and the main seal (gasket).
“Depending on the pump, all of those are replaceable,” he says. “Typically, as a pump goes up in price, more parts are replaceable and available to replace.”
Brands such as Lezyne, Park Tool, Specialized, Bontrager, Silca, and Topeak offer replacement parts and rebuild kits for floor pumps. If that doesn't seem to be the case for yours, you might still be able to fix it. O-rings in particular, which…
