If it has the pressure tap, you can always run it without the tap (on the ground.. not in the air) and force it to full throttle to see how it runs. If it leans out quickly, then attach the nipple to the pressure tap and then pressurize the tank and see how it runs after that. It certainly can't hurt anything, that's for sure.. just do not run it lean for a long time. You should be able to tell pretty quick if it is leaning out because it may never make it to full throttle before quitting.