253 t30 wont restart

I just got a 253 t30 200 gallon compressor. It has a 7.5 3p motor. Starts right up and goes up too 180psi. When it shuts off it won't restart. I believe the problem is in the governor unloader. Before I tear into it could someone explain the small tube on the low pressure head that goes to the crankcase. Thanks

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