Tamiya Basic Spray Work Airbrush keeps spraying paint without pulling trigger

The olny way for paint to come out of the nozzle without pulling the trigger back is cause the needle is not seating completely. It could be some junk, a piece of metal, etc not allowing the needle to go all the way forward.  

Thanks. I'll try that. It's just odd this happened when the airbrush is new never used. I even lowered the PSI. 
thanks 

Strip down the airbush and clean each part with lacquer thinner very thuroughly. That should stop the paint spraying out the tip. The air trigger is stuck. Remove the trigger and clean it from the top. Clean it with thinner also and put some lube on it and reassemble it.