i've got a pm bullet 2 and never have had that problem. i'd disassemble the injector to see that it's clean and reassemble according to the instructions. check where the injector sits in the base to ensure its clear. does your injector have a control for volume of air? you should be able to have the skimmer operational for water flow without any air. then slowly try to turn on the air.
good luck
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tanks:
120g w/starphire front, pm bullet 2 skimmer, yellow tang, emperor angel, niger trigger, spotted hawkfish, blue tang, flame angel and 120lbs lr
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