Thanks Gerry. The overflow happens with the tank cap on or off. I took the carb back off and have it on the workbench right now. I can tap the return pick up down but I’m not sure how far or where it should be. I’ve tried googling for pictures but no luck.
I am a newbie in shifters and pump around, so it may not be the solution and I was lucky, but I was experiencing the exact same problem and by changing the foam inside the carb did the trick. I have no more overflow…