fuel pump problems

i parked my car then about 2 hours later i went to jump into it and move it but it wouldn't start. then i realized that the fuel pump wasn't starting when i keyed it on. I was wondering if anyone would have any ideas on what the problem may be? I was thinkin my inertia switch is having problems anyone know where it is located?

nvm i figured it out. i found out where the inertia switch with lots of searching and that was the problem but one other question why would the switch kick out when all i did was move it about 50ft not driving it hard and only driving over a pit???