My son has an '04 Mustang and a need help. It won't start. It was stolen and wrecked a few months back, but started and ran once. I was told to check the fuel inertia/safety reset switch. Should the red button be all the way to the top or closer to the bottom but not touching the bottom? When I turn it over, I can not hear the fuel pump, but it was changed out less than a year ago. I checked the fuel pump fuse under the hood, and it's good. Where do I go from here? I am not knowledgeable about these things, and don't have the $$ to take it in right now. Any info is greatly appreciated. He's driving me crazy! and for some reason thinks "mom" can figure this out. also, don't know if this applies, but his aftermarket stereo equip. was stole including fuse under hood, and wires were cut and yanked out (thought maybe they may have pulled something loose).

 

Well if the fuel pump relay switch is out then it will not start. Only thing I can think of is unplug the switch, then undo the battery terminals. Wait a few minutes, go back out. Plug the switch back in and then reconnect the battery. This should reset both the switch and the ECU. If neither works then odds are the switch is bad.

Oh the switch is located in the trunk on the drivers side behind the side panel cover. You may need a screw driver to help unplug the switch.