If your airless spray pump primes and pressurises but nothing happens when the trigger is pulled, and it is not the airless spray tip that is blocked, the actual spray gun hand piece could be where the problem is located.

The first thing that needs to be done is relieve all pressure from the airless spray system by opening the prime spray or bypass valve and turn the machine off.

Airless spray tip blocking is annoying and can ruin the spray painted surface with spatter or heavy lines of paint. There are a few common reasons causing airless spray tips to block and one of the most common is a problem with filtration of the paint within the airless spray equipment.