Gas tank leak

Agreed, I just fixed this on mine. The aftermarket lock rings that come with the new senders are half the thickness of the original ones, I bought a Spectra thinking it would be good, it wasnt. The solution was to find my old lock ring in the garage and use it on the new sending unit. I cant believe they have overlooked this on the aftermarket sending units. The thinner lock ring does not put enough pressure against the gasket. Hopefully you have access to a stock lock ring, mine hasn't leaked a drop since.