Where is the fuel cut off switch on a 1999 chev suburban one you have to reset if in an accident?

There isn't a fuel cutoff switch on a 1999 Chevy Suburban that you manually reset after an accident in the same way some older vehicles had. Modern vehicles rely on other safety systems, such as the crash sensors that will shut down the fuel pump in a significant collision. These systems are automatically reset once the system detects no further issues.

While there might be an inertia switch (sometimes called a crash switch) in the fuel system, it's not typically something you manually reset *after* an accident. If the fuel pump isn't working after a collision, the problem likely lies with the fuel pump itself, the fuel pump relay, wiring, or the crash sensors triggering a shutdown. You would need to have a mechanic diagnose the issue. The inertia switch, if present, is usually located under the vehicle, sometimes in the engine compartment, but it's not a user-serviceable item that requires resetting.