Just picked up a. 3Z180 that has been sitting for 7/8 years .
just got thru wiring the 5 hp 3ph.
Pumped up to 100 psi pretty quick ,stopped it and the governor bleed off was leaking and a small amount coming out air filter.
The back flow valve was shot,that should take care of unloader leaking but is worth trying to clean up the valves or just run it a while and see?