Where is the fuel cut off switch on a 1999 Oldsmobile bravada?

There isn't a readily accessible, easily-found fuel cut-off switch on a 1999 Oldsmobile Bravada like you might find on some older vehicles or equipment. Modern vehicles generally don't have these as a standard feature for safety and security reasons. The fuel system is controlled electronically and shuts off automatically in certain crash situations. Trying to manually cut the fuel would likely require extensive modifications and is not recommended.