Wow, thanks! I have already replaced the 394 diaphragm and checked the 612 screen. But didn't know about the screw tightening sequence, maybe I messed something up. It's now past mowing weather so I have time to work on it. Thanks again!
I usually take the tank off and drop the tank down on top of the carb & diaphragm to avert the chance of getting the diaphragm & gasket out of place then fitting them
The problem I usually find is the diaphragm is in the wrong place