Sit down right now and document every darn thing that happened, from the time you stopped for gas, any paperwork (cash? Credit Card/ATM, etc) and did you keep the paper that slid out of the machine? What time did it die, what time did you go see Carlos and precisely what did he say.
Write it down as soon as possible so you can remember everything. This might become very helpful if it comes to a law suit, or even with the insurance company. Also, make copies and never give out your only copy.