TwistedPhil
+1y
Depending on the brand of pump, replacement parts are usually available. If it's a York compressor, you can get the parts at almost any auto parts store. Piston, sleeve, etc. are all available separately, too.
As for the labor, you should try it yourself if you have basic tools. There's really not much to the piston-style pumps, so you should be able to rebuild it yourself- good luck!
-Phil at FBI