Craftsman 150 psi 1.5hp 15 gal vertical not pover off

SOURCE: lack of pressure

My air compressor builds up to 40 psi and just keeps running, i have a craftsman 5 GAL, 1HP, 125 PSI and pressure goes up to 40 psi and dose not go any higher and on the other hand engine keeps running and dose not stop. Please advise?
Thanks.
Kia

SOURCE: I have a craftsman 3.5HP 30 Gal compressor (Model

Unless your machine is worn out----it's probably the pressure switch:

A: needs adjustment

B: needs to be replaced

XYZ: head gasket leak,broken line, other air leaks?

SOURCE: Craftsman air compressor 1 HP 12 gal 125 psi

this is probably an "oilless" compressor, it has "piston" with a thin ring of leatherlike material acting as a piston ring, the "cylinder" is an aluminum sleeve - what usually happens is the cylinder gets scratched from dirt or just wear or the leather ring deteriorates, that's why it will go only so far - the only fix for this is to replace the cylinder and the piston

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: 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!