need quick help with a 2000 chevy silverado please?

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well im supposed to go camping tomorrow with my grandparents, and mom and dad will be up a few days later, but anyways,yesterday, my grandma was cleaning out thier silverado, and took a waterhose to the inside of the cab, shes done it many many times before, but after she did it this time, the truckwouldnt start, they told me over the phone that the security center on the truck has shut off the fuel supply, and we really need to know why and how to fix it, we need t have it fixed by noon tomorrow, if it comes down to it though, they can use my 88 ford or moms 97 ford, but neither of them have electric brake hookups, wich we could put on(already have brake controllers)
but if someone could help, we would greatly appreciate it, btw if you need to know, the truck is a 2000 silverado with a 5.3L vortec and an automatic transmission, Dana Holcomb(mechanic) is supposed to stop by later and look at it, but he doesnt know whats wrong with it, thanks for ANY help

 

[idontgivafork]

ill give you 3 guesses to whats wrong with it, hug your grandparents and you drive.you can try turning the key off for awhile and then try it.