Phil: one more thought. There is a check valve in the outlet of the dryer that is intended to prevent backflow of compressed air from the reservoir once the governor cuts off the compressor. Since it seems you have some compressed air coming out with the compressor off that check valve has to be leaking and draining the reservoir pressure. If it was just the purge valve the leak would only occur while the compressor was running. You may have two problems, a distortion where the purge valve is and a bad check valve. Ready for the trifecta?
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Jon and Alie Kabbe
Started with 77 Coach
Now have 39' 93 coach
2007 civic toad
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