1.5 hp husky air compressor won't build pressure over 100lbs psi continues to run

SOURCE: I have a Husky model Y6010 air compressor.

First remove the valve using probably about a 1/2" wrench but make sure there is no pressure in the tank before you do so. check the cone and seal by loosening the valve by hand and check for debris. If there is no debris then the problem is either the pressure relief valve or weak pressure regulator but may also be a bad piston seal if it is a direct drive unit.

SOURCE: My craftsman air compressor model 919 16737 1.1 hp

Probably the check valve has failed. It apparently is where the pipe goes into the tank from the compressor.

SOURCE: My husky 2 gallon air compressor is not building

sounds like the compression rings on the piston neen replacing or the none return valve faulty.

SOURCE: I have a model FP209501 Air Compressor 2 Gallon,

The spray gun consumes more air volume than the compressor can deliver. You can pause painting periodically to allow the compressor to 'catch-up' or buy a larger delivered-volume compressor. The compressor that you have was intended to supply air for pneumatic nailers and staplers in an intermittent fashion. Hope this helps!

SOURCE: craftsman 3 gal air compressor - no air presssure

Check the head gasket. Mine just did the same thing. Mine was blown between the two chambers on top. It's very thin right there. I went to the auto parts store and bought some gasket and made my own for about $6. It's up a working great...finally. BTW the gasket kit is on back order right now at Sear's parts website. It appears we aren't the only ones with the problem!