Are you talking about the diff vent tube? And when you say the ARB compressor running do you mean the locker in the ON possition also. If the Locker is in the off position with the compressor running and air is coming out of the VENT not the Vacuum line, then you have other issues. :flipoff2:
I just had this issue. I could hear air leaking out the diff. breather vent tube. Turned out the fitting where the copper line goes into at the housing was leaking on the inside. Needed to replace the ferrule & tighten it up & all was good.
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