[chiphead]

OK this might sound like a stupid simple question, but what is the proper way to check the fuel levels in a holley double pumper?

My engine started running really rich for no reason, dipping down into the 10s on the AFR meter at light cruise. I took the bowls off and found I had improperly installed the float spring in the primary bowl. No dirt or contaminates were found in bowls or filter. The needle/seat assembly is less than a year old. I rebuilt the carb last summer. I cleaned and inspected everything before I reassembled it (correctly) this time.

This is a modern QF copy with the large sight windows in the bowls. I assume the fuel level should be in the middle of the window with the engine warmed up and running at idle?

The gamut of instructions on the net don't clarify if the engine should be running when the final fuel level is verified, after the adjustments are done and snug.