a powder coating system for difficult to handle powders includes a powder hopper containing fluidized powder particles , a pump body connected to the hopper and having an inlet in communication with the hopper , an ejector nozzle mounted to the pump body and aimed at an outlet thereof , a second nozzle mounted to the pump body and aimed at the inlet thereof and a powder application device for receiving powder particles from the outlet of the pump body and spraying them onto an article to be coated . the ejector nozzle sprays pressurized air toward the outlet to transport powder particles along a flow path which extends from the powder hopper into the pump body via the inlet and then out of the pump body via the outlet . the second nozzle sprays air pulses at the inlet in a direction opposite the particle flow along the flow path caused by the ejector nozzle . this spray from the second nozzle creates microvibrations in the inlet of the pump body to eliminate powder particle adherence and cohesion thereat . the pump body may have separate , spaced intake and ejector portions , with the ejector nozzle mounted in the ejection portion and the second nozzle mounted on the intake portion .