FREE air compressor does not build more than 30 PSI of pressure?? Shut the drain valve at the bottom of the tank if it's open. I checked the cylinder head and found one of the bolts loose. I have a Craftsman Model 919.167242 air compressor. Luckily there are a few things you can check that will help you determine why your air compressor won’t fill the tank all the way. it has two pressure gauges, one for the tank and one for the hose. Or, when an air compressor will not stop, it could also signal a major safety concern, and should be addressed immediately, before using the compressor again. The pressure should build to 135 psi and the motor should automatically sh … read more Still had the problem. Check the Intake and the Pressure Valves The intake valve is the mechanism on a reciprocating air compressor that allows air into the chamber when the piston is pulling downward. Husky Air Scout won’t build pressure by: Bill “Compressor ran but wouldn’t reach 115psi.” OK. That you were changing air nailer sizes shouldn’t have anything to do with this. I tightened all of the bolts. Tighten loose air tube fittings to prevent air leaks. The air pressure won't build above 30 psi, but, the motor continues to run. In some cases, a compressor will run as though it is functioning properly when, in reality, there is a problem with compressor pressure. The air compressor runs, but does not build any air. I checked piston ring and everything looks good. It would run and build pressure but never shut off. I have a 2 hp, 6 gallon, Bostitch air compressor. Once again, it’s time to tear down the pump. If the pressure in the compressor tank is dropping and nothing is using air the leak may be bleeding off enough air that the compressor can’t build tank pressure past a certain point. What you are checking for is an air leak that you won’t be able to hear when the compressor is running. just bypassed the hose valve pretty much and now it won't build and pressure. When an air compressor will not stop it could signal a problem with how the air compressor is pumping air into the compressor air tank. Another spot to check carefully is the unloader valve. the hose gauge is hooked to a relief valve. Check for air tank leaks and replace the tank if it's leaking. that only builds 30 PSI of pressure. Compressor Will Not Build Pressure. There may be some buildup of air in the compressor, or it may not have any air at all. I picked up a free HUSKY 20 gallon air compressor. If the symptoms related earlier about air exiting the oil fill tube or intake port is not happening on a compressor, yet the compressor continues to run with no build up of pressure, then it’s likely that there is a pump gasket failure. Air Compressor: Won't build tank pressure. I have a 12 gal Husky air compressor that i bought from a friend still fairly new. I replaced the pressure switch and regulator. 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