When I had the first 100 hourly done on my J230, my LAME found the rear fuel feed line from the right tank had a kink (from factory build) that stopped fuel flow completely from that line. Luckily the front feed was ok but I reckon that had a bearing on the way the fuel fed. To check this, you have to remove the wing root covers and have a good look with a small 'dentist' mirror. This can happen as the lines are fitted THEN the wings mated up and bolted.