We got over to the Valero Gas Station and put in 70 dollars of diesel

Diesel???? Really????

Doesn't your motor run on gasoline. Forget Ricardo, here's the solution:

You would need to have the tank drained and the fuel system cleaned out before the van would start again.

With no other option, you will have to call a tow truck to take the van to a nearby mechanic. The mechanic, well the one at Fort Stockton (a good choice for mechanical assistance as it's at the crossroads of Interstate 10 and U.S. Highway 285, making it a notable stop for travelers) yes, Ricardo will then confirm the mistake and give you an estimate for the repairs. Maybe call Emilio who is already out to get the supplies, and ask him to bring a tow truck...

Meanwhile, Carolina got around remembering the number, from the clues....

Can you call to confirm, wait is it a phone number?

Either way, let's dial:

767-935-4534

Edit: I didn't think that Carolina was going to meet that someone on RV... So I decoded SOS as 767 indicating she was going by air to the Commonwealth of Dominica

When SOS can be 505 (new Mexico) as indicated by several users