Each of the 4 tanks have a Stewart Warner 385 AB-P quantity sender. While these can be changed out if defective, I've done it once before on a different plane,and it is a real PITA. So scrutinized each of the 4 senders as I took them out of their packing. One does have a gouge on the float, but as best I can determine, it is not compromising the float's buoyancy. Then discovered no matter how long I searched that I'm out of NAS603-8P screws which mount the sender to the tank. Ordered from ACS and will arrive next week.