Airless Sprayer Not Priming

One of the most common causes of an airless paint sprayer failing to prime, especially after it has been not used for some time, is the valves in the pump sticking closed with dried paint. This will prevent the airless paint sprayer from priming at all until these stuck valves are located and freed.
A good online guide about troubleshooting an airless paint sprayer that will not prime with tips for locating the valves and freeing them can save a lot of time in most cases.
Properly preparing any airless paint sprayer for storage between jobs will save lost time on the next airless spray painting job and also prolong the life of any airless paint sprayer through a real reduction in corrosion internally.