did you prime the pump?
I had a similar problem yesterday when I went to use my Graco 395 sprayer. It came out just as a stream.
Then I grabbed the instructions
, and forgot to complete the step of priming. prime might not be the exact wording, but thats what it did. It got rid of all the air in the lines, etc. so that the paint would come out evenly under the proper amount of pressure.
on my sprayer, I had to put a lever in the downward position for 15 seconds or so, to let the system pressurize, then i flipped the lever forward to the spray position. let the system build up pressure then sprayed. finally got the fan pattern instead of a stream
I also brushed the filter that was in the handle