To try to explain how it works a bit... The purge valve is sent a pressure signal from the governor when the compressor cuts out. If you think about a shop air compressor, the air release when the compressor unloads as it stops is the same thing that opens the purge valve on your truck. The purge valve could be sticking, it could be the governor, or, not likely, but it could be an internal leak in the compressor. Pay attention to when the purge valve closes, if its when the compressor starts pumping again, I would change the governor and go from there. Governors are cheap anyways.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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