Don't neglect the idea of a "bad-in-box" pump - it's uncommon, but it happens.
Disconnect the hose at the pump and check delivery pressure (your thumb will usually tell you enough.) If that's good, disconnect the hose from the nozzle end and blow it out with compressed air (yes, leave it disconnected from the pump do these) or with water pressure from a garden hose (hose barb adapters in various sizes are usually available at the hardware store, I have several for this sort of thing.)
Both are easier than replacing the hose outright - and if you have a blocked line, it's better to blow it out backwards than forwards. Using forward pressure often lodges the blockage more tightly into the line, rather than loosening it...