The fact that your air tank has a hole in it tells me that it is probably rusted internally. I would not attempt to repair it as the tank is probably unsafe.
SOURCE: Constantly releases 30psi of air into atmosphere before holding air in the tank
IS THE AIR LEAKING FROM A SMALL LEVER ON THE SIDE WITH A TIRE STEM VALVE IN IT. IT HAS A SMALL COPPER OR PLASTIC LINE COMING FROM IT? THIS IS THE UNLOADER . IS SO YOUR INTANK CHECKVALVE MAY NOT BE HOLDING.
THE PRESSURE SWITCH IS TYPICALLY ADJUSTABLE FOR CUTOFF PRESSURE AND THE DIFFERENTAL (SPREAD) BETWEEN CUTIN AND CUTOUT
SOURCE: Leaking sound coming from top
hi buddy the pipe that comes from the pump to the tank connects to a non return valve (pic below) on the tank unscrew the end of this and turn the rubber around inside and try this get back to me if no difference 
SOURCE: Craftsman Pancake Compressor loosing air while
That is likely the compression release. A pintle valve in it should close while the pressure switch runs the compressor. After the switch cuts off, the valve is released to bleed the pressure off the cylinder head of the compressor to allow it to restart without having a load on it.
When the pressure switch cuts off you should hear a woosh as it bleeds but it should NOT bleed while it is running. Take it apart and clean the seat. Be careful of springs that go sproing.
SOURCE: Air compressor leaking air
you have a bad check valve ,the little brass valve is working normal
SOURCE: I have a pancake compressor that won't hold air
If you replaced the head gasket then its probably the valve plate and gasket.
See here:
http://www.chasdayco.com/mm5/breaks/PorterCable/20041110144417_A08610-E.pdf
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