Air leaking from pressure relief tub
STOP. What pressure does the gauge show? If it's higher than it should be, drain the tank and replace the pressure switch. If it's not unusually high, then replace the pressure relief valve.
DO NOT let that compressor run at too high air pressure! A burst air compressor is a TERRIFIC bomb, and can kill you before you know what happened!
SOURCE: Leaks air at the pressure switch
start your compressor and let it buid up pressure to turn off. then unplug from power.lossen the fill tube that goes from the pump to the tank. when you loosen it. if it leaks air then your check valve is bad and will have to be replaced.
SOURCE: AIR LEAK ON CRAFTSMAN AIR COMPRESSOR, 3HP,25 GAL, HORIZ TANK
The needle valve that you see is the unloader which releases air pressure from the discharge line after set pressure is obtained. If air continues to leak after the compressor shuts off, the check valve installed in the tank is leaking air out of the tank. Follow the air discharge line from the compressor to the tank. There you will find a brass valve which is the check valve. Simple test is to remove the smaller airline (1/4") from the brass valve and check for air leaking. If leaking remove brass valve and check for debris under the white seat. If you cannot clean the valve, replace with generic check valve from www.grainger.com. It will cost less than factory part. Just order the valve considering the fitting sizes that you need. For exact replacement,( www.sears.com parts). If you sears model # begins with WL then your compressor is made by campbell hausfeld and parts may be ordered from www.chpower.com. Good Luck with you repair and email if you have more questions.
SOURCE: compressor not building pressure in tank
check this blog for assistance. reed valves or piston worn
http://www.fixya.com/support/t1104466-craftsman_air_compressors
SOURCE: Was working normal suddenly will not build pressure
Maurader1 an apprentice has this problem solved and is spot on. All these gurus and wiz need to stick to the basic and common sense. The first place your pump will give out after use or abuse is the gasket. All this garbage about defective reeds and defective pressure switch is a lot of nonesense if you first don't rule out the most common problem the head gasket. I'm cheap and this thing has paid for itself 10 time over. You can get a gasket kit for $7, but I fabricated a gasket out of the back of my notebook and sprayed some gasket spray and been working like a charm ever since.
SOURCE: I have a Craftsman 3 gallon 1HP air compressor
Sounds like the compressor has failed -- probably the valve -- tear down and rebuild is probably the solution, or replace compressor, or just buy another unit. My nature would be to tear it down and see what's going on.
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