Airbrush not working!?

Well it's been a while, but I'm back now. Finally got to pick up an airbrush and a Compressor. Actually, I got the airbrush for x-mas last year or the year before, and finally got the money for a compressor. Got outside and went through all the directions and stuff, and tried to spary some water through my brush. Nothing but air came out. Messed with the nozzles (whatever they're called up front) and still nothing. Took the back off and took the needle out to wipe it off real quick, put it back in and made sure the nut was real tight (by hand). Still nothing but air. Wtf??? :confused:

What kind of airbrush?

It's an Iwata Revolution bottle feed

Have you cleaned it? Do you have the suction straw on?