I replaced the 802a well nut with a bulkhead nut.....
Went in through the fuel float hole since that was closest. I used one of those tie-ons y'all can buy at Home Depot. It worked 'cause I could form the tie to an approximate the shape to deliver the brass fitting to the hole.
If you notice in the picture, there is a sharp bend in the tie about 6 inches from the end. It sorta looks like a knot. That "knot" would not let the fitting pass so I could pull it through the hole in the tank by grasping the working end of the tie. I could also slip the washer and nut on to the fitting more easily and hold it tight to make putting the nut/ washer on.
Also used a grinder to relieve the sharp edges of the nut and to cut small notches on each of the hex flat spots. Used a screwdriver in each notch to turn the nut 'till I could reach the flat spots on the threads with a wernch.
I'm sure there are plenty of ways to do it, but this method made sense to me.