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. 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. I tightened all of the bolts. Check for air tank leaks and replace the tank if it's leaking. There may be some buildup of air in the compressor, or it may not have any air at all. I have a Craftsman Model 919.167242 air compressor. Need help replacing the Pressure Switch (Part n003307sv) in your Porter Cable Air Compressor? just bypassed the hose valve pretty much and now it won't build and pressure. It is likely (I think) just coincidence. 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 would run and build pressure but never shut off. The air pressure won't build above 30 psi, but, the motor continues to run. well the relief valve got stripped out and wouldn't stay opened so i took it off and hooked the hose to the tank pressure. Another spot to check carefully is the unloader valve. The air compressor runs, but does not build any air. the hose gauge is hooked to a relief valve. Still had the problem. I have a 12 gal Husky air compressor that i bought from a friend still fairly new. The pressure should build to 135 psi and the motor should automatically sh … read more Shut the drain valve at the bottom of the tank if it's open. that only builds 30 PSI of pressure. I checked piston ring and everything looks good. I have a 2 hp, 6 gallon, Bostitch air compressor. Once again, it’s time to tear down the pump. 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. 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. it has two pressure gauges, one for the tank and one for the hose. In some cases, a compressor will run as though it is functioning properly when, in reality, there is a problem with compressor pressure. Air Compressor: Won't build tank pressure. What you are checking for is an air leak that you won’t be able to hear when the compressor is running. Tighten loose air tube fittings to prevent air leaks. I replaced the pressure switch and regulator. I checked the cylinder head and found one of the bolts loose. I picked up a free HUSKY 20 gallon air compressor. FREE air compressor does not build more than 30 PSI of pressure?? Compressor Will Not Build Pressure. 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