Depending on what carb you have will dictate what fuel presure you need. If you have a hitachi, watch the float bowl window, and see if it is staying full. Hold it at say 4000 rpms and check to see if its still keeping fuel up to it. If the presure is too high it will flood your engine. I had mine so high once that at idle it was running rich, and when I opened the throttle it stalled . Then when I tried to restart it , the motor hydraulic locked!