Steps To Take when You Accidentally Put Regular Gas In Your Diesel Vehicle

 Call AAA.

 Load it up.

Ride for three hours in the cab of this truck learning AAALLLLL about the tow truck bidness.  Incidentally, it wasn't me.
Furthermore he has owned this very pick-em-up-truck for eight years.
Direct quote from Bro-in-law, "You will put the wrong gas in it but you'll only do it once."