SOURCE: Craftsman Air Compressor
may need to check the adjustment on presure relief valve on tank or check pop off valve on the top of the pump head.there may be some debree stuck in valve.
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: Will not build up pressure
If this compressor is dry type with no oil needed, then it may have a worn cylinder and/or piston ring. With flashlight in hand, look under cylinder with piston in upper most position. If you see scratches most likely it needs cylinder / piston kit. Not to worry, not too expensive. If you compressor has a crankcase with oil, then you may have problems with valves in the head. Cracked or dirt under headvalves will prevent pressure from building. Finally there may be one or several leaks in the tubing, check leaks with soapy water. enjoy
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.
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