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Here is a pic of my wet tank both ends. The relief valve is rated at 150psi. (Almost all the over pressure valves are) This is is the downstream end with the low pressure sensor, PPV, and main feed line

If you can, take a picture of the valve. Some trucks have had some strange things done to them.

So the over pressure valve on the wet tank is venting? The tank should be at 110 to 130psi, depending on the governor cut off setting.

Edit: this info is for a A2 939 series. My unloaded was sticking due to carbon build up. (Compressor draws air from the intake, so any oil from the engine, transmission, or transfer case. Gets cooked in there.) You can pull the intake side off the compressor and look inside at the unloaded...