As to the original epoxy question, until recently I would have said that any regular 2 part epoxy would not be affected by diesel. However, I used a good 3 to 1 epoxy to repair a hot tub this summer, the repair was done correctly, epoxy set up good, "glass was hard, next day tub was filled. about a week later it started leaking. After draining and looking at the repair the epoxy was soft, almost rubbery. I have no idea why. Maybe chemicals used in the tub or something. The epoxy may have been old, I dont know. I've not had this happen befor. My opinion is that epoxy is pretty much impervious to most things, diesel included.