the style of compressor has little to do with bleed down. it is the connections, or possible a leaking component. immediately after the pump is a one direction check valve, from that point on (tank, tank drain valve, regulator, on/off pressure switch, over pressure/relief valve, head unloader, connections, etc.) - it is all subject to leaking.
leaving a hose and tool connected raises the chance of bleed down. but with nothing connected, it should hold. can you hear the leak? you can spray a soapy water solution on all of the connections and watch for bubbles.
Last edited by TimPa; 01-25-2016 at 07:26 AM.