Sending Unit Float Question

Even the brass floats get leaks, usually a little pinhole. When you take it out and see a wet spot that remains. For my 65 Dart, I bought a new stainless steel sender on ebay for ~$45. It has a 3/8"D outlet and a 1/4"D return. Made in Taiwan. I need a return for my EFI, though 5/16"D would be better.