Medium and Heavy Trucks
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there are so many fittings and lines that we cannot tell you exactly but if it is only when it is running, then we can tell you which area. the compressor should go to an air dryer. from there goes to the air tank. there is an check valve in the tank so it should be from compressor to the tank. check the braded lines with soapy water, the dryer around the edges and bottom and the line fittings which are common. check the governor as well. it is on the top back of the compressor.
the only thing that the ecm controls air actuated is the fan solenoid. without me being there to actually check it is hard to pin point from a distance. how do you know it is from something ecm controlled??