Fuel Filler Neck Grommet Replacement

So today I discovered that I have a leak around the opening in the gas tank where the fuel filler neck enters the tank. These are all new parts from my build. The tank does not have the big rubber grommet because the dummy that final assembled my car (not me) tore the grommet and quick fixed the obvious leak with the gas tank epoxy sealer. I suppose I could add some epoxy sealer to the area of the leak to try to seal it up again, but I suspect I may just end up with the same problem all over again. It looks like the rocking and vibrating of the car loosened the epoxy around the neck right at the point it enters the tank. So the smart way to fix this would be to install a new grommet. Unfortunately that may have to wait until after Carlisle, so I guess I will be half-filling the whole trip.

My main question is can the tank be separated from the filler neck without loosening the filler neck from the side of the car? When we were assembling the car at the end of the build we scratched the hell out of the side of the car twice because of the difficulty of moving the filler neck. Would appreciate any recommendations or advice, including adding more epoxy. Thanks.

So no smoking around my car if you see me at Carlisle.