First, raise your jug up high, put your sprayer lower, and try that. I got mine to work once or twice that way. We usually had to put suction on the sprayer though. I used the small portable extractor unit for that. I put the end of the sprayer inside the opening on the extractor and put my hand around to to form a partial seal, enough to get some good suction on the sprayer. That usually primed it. After I replaced the pump I didn’t have the problem any more.