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I have a Porter Cable pancake air compressor CFFN 250N manufactured in 2004 that has an air leak. Pressure can only get to 80 PSI. Checked all the connections and found no leaks. Finally took the cover off the pressure switch box and felt air coming out behind the electrical wires. Apparently the on/off pressure sensing switch is stuck partially open. Any ideas as to what to do to save about $90 that Porter Cable will charge to fix it? Thanks

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There is a check valve where the line goes into the tank. The purpose of this valve is to keep air from coming out of the input line. This valve is likely the culprit and it is leaking out of the unloader. The unloader is actuated by the electrical switch when the compressor shuts off, and it relieves the pressure on the line so that the pump is not under load when it tries to start.

Posted on Feb 02, 2010

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