![]() ![]() It’s worth checking the piston seal and rings at the same time. How to Check if the Compressor Piston Seal is Failing Once you have eliminated all other reasons why the compressor runs but doesn’t build pressure, it may be time to tear down the pump and examine those valves. The valve problem may also not appear until a certain tank pressure level is reached, at which point, the valve problem manifests itself by the compressor continuing to run, but no further buildup of air tank pressure occurs. If either the intake valve or pressure valve fails (breaks or fails to seat properly due to debris build-up) then your compressor will run all day and never build very much pressure in the compressor tank. Low-cost reciprocating compressors typically have low-cost reed or flapper-type valves which, at least according to the number of persons that report valve issues on this site, don’t seem to last very long. Other styles of air compressor pumps have valves too. Reciprocating air compressors have valves that allow air to enter the cylinder area when the piston is moving down, and allow the air to be directed into the tank line when the compressor piston is on the compression stroke. When a compressor pump is driven by a properly working motor, and the pump is cycling, so why does the air compressor runs but doesn’t build pressure in the tank? Next comes the most likely reasons. The pump is then supposed to drive the air it takes into the tank, and in so doing increase air pressure in the compressor tank.ĭifferent styles of air compressors, reciprocating versus rotary screws, for example, accomplish this with different methods, yet they pretty much all do the same thing, suck in air from around the room or through an outside air intake and drive that air into a tank to build up pressure. That intake port on the pump typically has a filter on it to keep dust out of the pump. On all air compressors, the pump pulls in free air from the atmosphere through an intake valve. ![]() This pump is also missing the valves or valve plates which open and close depending on whether the pump is in the intake or compression cycle – you can see those below. In the photo above, part of what’s missing is the pump head, which will contain an intake port. The part that actually compresses the air is often referred to as the pump, or compressor pump. The air compressor is really a pump driven by an electric motor, or perhaps with a motor driven by other fuel types like gasoline or diesel. Why Is My Air Compressor Not Building Pressure? ![]()
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