My compressor only builds up to 40 psi and keeps running until turned off. While running air comes out of the air filter attachment. When off it stays at 40 psi. I replaced a broken hose earlier. Suggestions? Thanks

SOURCE: air compressor 3 gallon

When I turn compressor on it does not build up any pressure ?

SOURCE: compressor will not build pressure

compressor will not build pressure

SOURCE: Craftsman 30 Gal. 150 PSI Not building air over 45lbs

The compressor valve may have a faulty gasket or seal, and maybe leaking air internally. Or the compressor might be going downhill. You can try to replace the valve seal and see if that makes a difference, otherwise you need to replace the compressor.

SOURCE: Air compressor won't go over 40 psi?

my ace air compressor which is 26 gallon 5 hp will not get over 60psi what is wrong with it please?

SOURCE: air compressor air intake blows out hot air and wont build up psi

its either a reed valve broke or corroded beyond function.remove the head and look at the plates.look at the piston rings while your in there sounds like its just worn out,but i just rebuilt mine for 80 bucks thats all the gaskets plates and piston with sleeve.the repair takes about an hour.if you do tackle this yourself remember the fan for the air cooling may be reverse thread.try not to break it.noone mentioned this to me but i got lucky and tried the other way before i got serious about removing it.good luck