Any leak under the cover after compressor shuts off is caused by the in-tank check valve. Follow the discharge airline to where it attaches to the tank. This connection is the check valve. Debris from the pump cycle (bits of piston ring) will get trapped under the valve keeping it open. Good luck
SOURCE: I have a 6 gal, 150 psi craftsman compressor.
This product manual will show the exploded view on how it comes apart/goes together:
http://c.shld.net/assets/own/00915216e.pdf
SOURCE: Porter Cable pancake rated at 150 PSI stops at 135 PSI. It has done this since it was new.
If it's pumping up to 135 psi, shutting off and then restarts at the same pressure point since it was new, the pressure switch may have been set low at the factory. I don't know which model you have but most pressure switches have directions inside their cover as to how to adjust the cut-out and cut-in pressures. Be careful doing this, overpressuring the tank is dangerous. There is an adjustment screw or bolt that changes the pressure on the switch spring. Some pressure switches have two screws, one for cut-in and one for cut-out pressure. A few have one that adjust both pressures. If you do adjust the cut-in/cut-out levels, do it slowly and cycle the motor a couple times between each adjustment to see where it turns off and on. If the compressor is doing what you want it to, only pumping to 135 psi, it will live longer than if you adjust it up to 150 psi. Those last 15 psi of air are hard to get and will mean the motor will be running longer and more heat will be building up in the head.
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