Why not patch your tank D-bag?
OP, I've never used vinegar. Nor have I heard of it. I just use old gas. The vinegar might f something up if you don't drain it all.
If you could post pics I would have a better answer, but too me. I would just Clean it the best I could, blow the fuel likes out with air, change the filter and put some fresh non Oxy in it with some good cleaner.
PS, on my 89 Ford it had sat for 10 years and still started and ran on gas that smelled like kerosene. But that's my luck I guess.
Oh, and I've ran a 4 cylinder on nearly pure T