This model comes in either suction feed or pressure feed. For example a 6211-4307-9 is a suction model. There are different air caps and needles depending on feed style. I assume your'e using either a 82-545 or a 82-555 suction cup attached to the gun. Make sure the tubing is tight, and that the vent hole in top of the cup isn't clogged. See Binks.com for detailed tip combinations.
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