In Reply to: Re: Another 641 fuel valve replacement posted by Mike in Michigan on December 28, 2019 at 23:08:51:
Oh I agree. But if you had a rusty gas tank and didn't want to line it, the new tank would be an option.
I think what you're doing will work. Drill out the rivet, replace the o-ring(s), and install a new screw (stainless?).