* Blown fuse: Check your owner's manual for the fuel pump fuse location and check its condition.
* Inertia switch: This switch is a safety device and might have tripped. Locate it (often under the dash or in the engine compartment) and reset it (usually involves pushing or turning a button).
* Fuel pump relay: This relay activates the fuel pump. It might be faulty.
* Fuel pump itself: The pump may have failed.
* Wiring issue: There could be a problem with the wiring to the fuel pump.
* Low fuel: Make sure you actually have fuel in the tank!
You'll need to troubleshoot these possibilities. A mechanic or a detailed repair manual will be helpful in diagnosing the specific problem.