First, congrats Forestor! Loud, but cool machines the 002's are.
Second, reset2:
I've had limited success using fuel tank specific epoxy, but not much.
About 6 months or so ago, I coated the interior of the tank with a product called "RedKote", and the pinholes were all sealed perfectly.
With holes 1/8", I would use fuel tank epoxy to seal it, then maybe add a sheet metal shield to the bottom for mechanical stability, then coat the tank interior with RedKote.
They specify that you have to cut in half and then sandblast a tank that's had diesel in it, then weld it back together, then coat it.
Instead of that, I let the tank air dry a few weeks, then put coarse sand in it, attached it to the front of a cement mixer, and let it rotate for a day or two.
Then rinsed it several times, stuck a heat gun in one port, set it on high for a half hour, and it was like new. I put about 4 coats in that tank, with a week or more between coats.
That's insanely time consuming, but I didn't need the machine for a while, and I could run it from a gas can if I had to, so it was worthwhile. Don't skimp on your fuel tank.