I was rear ended in my old suburban hard enough to bend the frame, but it wont start now. I was thinking it might have a cut off switch for the fuel pump but I don't know. If it does where is the reset button at?

It doesn't.

If the tank is in the rear than I think the harness for the pump is rigth behind the bumper. I'd take a look at that first.

Might want to check if the ground wire broke off the frame as well.

//2000CAYukon