<VV> Gas Tank "Sender" Unit

[Byron Comp]

I've discovered a leak at the gas tank's sender unit on my '64 Monza. I replaced all the internal stuff there early-on in the project, but as I've begun filling the tank two gal at a time, it started leaking. Is there something I can try to stop the leak from the outside or do I have to go back inside? Thanks for any advice.

Byron Comp
'64 Monza Vert.
Gainesville, FL