Man I feel for you...hope everthing works out OK.
The driver who delivered the Diesel to the wrong tank must have been sleeping that morning. I was under the impression that each ground tank was color coded and had it's own sized filler nozzle. But then again ...what do I know .
As long as their insurance company is paying the bill for the entire screwup make sure they do it right.If an Isuzu dealership is doing it for you check back often and demand the best...don't accept excuses or substitutes.
John