>>7258580The union in blue needs to be airtight and clean, usually tightening the nozzle cap correctly solves it. To make sure I used to put a bit of liquid masking there so it was airtight whatever I did but since I changed the body o-ring to a "squishier" one I can just depend on mechanical force.
Clean everything and check for defects or obstructed air conducts on the nozzle assembly and try that, hopefully it will be just a poor tightening or dirt
