The fuel pump relay is under the fuse box in the engine compartment. Most people have the problem that the fuel pump stays on when the key is off, runs down the battery. It is simple and cheap to replace the fuel pump relay. Use a spray lubricat like WD 40 prior to sliding the fues box and relay cover. Use motorcraft replacement relays. Replace both the FPR and the EEC relay, the third (front end) is the wide open throttle relay for the air conditioning.