Hello, I am wondering if you used the gasket o-ring set for the compressor or replaced the cylinder part too? As sold by ECS tuning

It makes a difference because the cylinder walls were scratched when I replaced mine. I think I need to buy the full kit from ECS.

Also I will check the valve group and hose connections for any leak. The problem I noticed is the hose going out from the compressor to valve group is always empty/no pressure when I take it out and I did not open the exhaust valve or anything.